Ge Acr11b User manual

•

t

•

..

•

Types

ACRllB

ACRllC

ACRllE

INSTRUC1'IONS

RECLOSING

RELAY

POWER SYSTEMS MANAGEMENT DEPARTMENT

GEN

ERAL

e

ELECTRI

C

PHilADELPHIA.

PA.

GEH-1786C

SUPERSEDES

GEH.1786B

'GEB-1786 Reclosing Relay Type ACR

2

Fig.

LA

(8013291)

jlf-!!L-.

. '

SWITCH

DE

-----I

SWITCH

JK-KL

SYNCHRO-

NOUS

-_~

MOTOR

\,

__

S'''CH

AS-BG

AETAI~ING

SCREW

---.",--i--

KNURI..I:D

DIAL

IUloe

ROL.L.EI~

ACTUATOR

Front

View Nameplate

Removed

INTERLOCKING

~P(~J\H

UNIT(l79E)

L.!lU[Y----.J

Fig.

lC

(8013414)

Right

Side

View

Fig.

lB

(8013290)

Rear View

Fig.

lD

(80<3413)

Left

Side

View

SWITCMGH

SWfTCMRS

;

AUXILIARY

I

•

RECLOSING RELAY

TYPE

ACRII

INTRODUCTION

The Type

ACRllB

relay

is

a

reclosing

relay

which

automatically

initiates

the

reclosing

Impulses

to a

circuit

breaker

which

has

been

tripped by

Its

protective

relay.

It

Is

basically

a timing device,

consisting

of a synchronous

motor

which

drives

a

gear

train

and a

cam

shaft with

resetspring

through

a

crown-gear

clutch with a magnetic clutch

release.

The

relay

contains a

series

at

cam-operated

switches,

an

auxiliary

unit and

an

interlocking unit.

The

cams

can be

arranged

to provide for an

immediate

Initial

reclosure

followed by

up

to

three

delayed

reclosures,

or

for

a delayed initial

re-

closure

followed by one

or

two additional delayed

reclosures.

The

reclosing

relay

resets

auto-

matically

a

short

interval

after

any

successful

reclosure,

or

from

Its lockout position following

a

successful

manual

reclosure.

Other

reclosing

cycles

are

also

possible

as

described

under AD-

JUSTMENTS.

The

ACRllC

relay

Is

similar

in construction

to

the

ACRllB

except

that

all

of the

adjustable

cams

are

singl.e ended. The

omission

of the double

ended

cams

permits

eliminating

the

definite

time

automatic

reset

feature

after

any

or

all

successful

t"eclosures.

Reset

is

accomplished by the

flat

ended

awl

after

successful

manual

reclosures.

The

.oller

actuated

switches "DEn-nGlII" and nJX"

are

set

as

outlined in the

text

for

the

ACRllB.

The

"RS" switch

setting

Is

made

as

required

In the

particular

application. The

Interanal

connection

diagram

Is

the

same

as

the

ACRllB.

The

ACRllE

is

similar

to the

ACRllB

except

that

It

has a

dual

rated

motor

ctrcult.

APPLICATION

The Type

ACR

reclosing

relay

is

suitable for

application whenever

It

Is

destred

to automatically

reclose

a

circuit

breaker

one

or

more

times

after

It

has

been

tripped

by

Its

protective

relay. When

Immediate

initial

reclosing

is

used, the

circuit

breaker

mechanism

should be provided with a

position

SWitch

or

latch-checking switch to

insure

that

the

mechanism

is

ready

to

close

the

breaker

before

the

closing

coil

Is

energized; and the

pro-

tective

relay

contacts

must

reopen

fast

enough to

prevent

retrlpplng

of the

ctrcult

breaker

following

Immediate

reclosure.

A D-C stepping

relay

Type

NLA

Is

available

to

provide

an

alarm

after

a specified number

at

reclosures

and a lockOut

after

a

spec

ifled number

of

subsequent

reclosures.

More specific information

relative

to

applica-

tion

Is

given in the section entitled APPLICATION

CONSIDERATIONS.

RATINGS

The driving motor

of

the Type

ACRll

relay

Is

available

for

operation on

a-c

only, and

Is

rated

continuously

at

the voltage and frequency indicated

on the nameplate.

The

auxiliary

units (interlocking unit 179E

anti-pump unit 119Z, and clutch

release

unit 179R\

can be furnished

for

use

on

eithera-cor'd-c

controi

supplies. The interlocking and clutch

release

units

are

suitable for

intermittent

duty only, but the

anti

-pump unit

Is

continuously

rated

at

the voltage

and frequency indicated on the nameplate.

CONTACTS

The

cam

operated switch

contacts

will make,

carry

and

interrupt

the following

currents.

VOLTS INDUCTIVE NON-INDUCTIVE

ABC

-

GHl

RS

ABC

-GHl RS

24

d-c

6 2.4 10 3

48

d-c

1 0.6 1.5 0.7

125

d-c

0.2 0.2 0.2 0.2

250

d-c

0.1 0.1 0.1 0.1

All

cam

operated switches will

carry

30

amps

for

tripping duty.

The contacts of the anti-pump unit 179Z and

the interlocking unit 179E will make

up

to

10

amperes

and

wUl

carry

1.0

ampere

continuously.

Its contact interruption

rating

Is shown

In

thefollow-

ing tabulation:

VOLTS

INDUCTIVE

NON-INDUCTIVE

250 D-C

O.lOA

0.20A

125 D-C

0.3OA

0.7SA

48 D-C 1.20A

3.5OA

230 A-C 1.0 A 2.0 A

11S

A-C

2.0 A 4.0 A

rlt.,.

i""rucliolll do

IIOt

purport

to

cov.r

011

detail,

or

voriotiolll

in

equipment

IIOr

to

provide

for

.very pouible

conting.ncy

to

be

m.t

in

connection

witlt

i""ollolion,

operation

or

maintenonce. Sltould furtlt.,

information

be

delired

or

"'ould

porticular

problem, ari

..

wlticlt

are

IIOt

covered ",fficiently

for

tit. purclto_',

purpoMI,

tit. matt., "'ould

be

r.f.,red

to

tit. General

Electric

Compony.

3

=-'--------------------------------------------

,~Eii-1186

Reclosing

Relay Type ACR

TOTAL TIME

The

Type ACR

relay

is

available

with a total

, of

three

minutes.

This

total

time

cycle

is

Jured

from

the

point

where

the

motor

starts,

to

in"

point following lockout

where

the

relay

will

again

reset.

BURDENS

The

burden

of the Type ACR driving motor

is

approximately

5

volt-amperes,

3.5 watts

at

rated

voltage

for

either

50

or

60

cycles.

The

burden

of the continuously

rated

anti-pump

unit 179Z

is

tabulated

below

for

various

volt.ages.

VOLTS FREQ. V-A WATTS

·250

DC

--

8.6

125 DC

--

4.8

48

DC

--

4.6

24 DC

--

4.6

240 60 13.5 8

120 60 13.5 8

• Includes

series

resistor.

The

interlocking

unit 179E and clutch

release

unit 179R,

during

normal

operation

of

the lrelay,

are

only

momentarily

energized.

The approximate

burdens

of

the

two

units

are

shown below:

D-C 60

Cycles

179E

31

Watts 165 V-A

179R 48 Watts 240 V-A

RECEIVING,

HANDLING

AND

STORAGE

These

relays,

when not included

as

a

part

of

a

control

panel

will be shipped in

cartons

designed

to

protect

them

against

damage. Immediately upon

receipt

of a

relay,

examine

it

for

any damage

sustained

in

transit.

If

injury

or

damage

resulting

from

rough handling

is

evident, file a damage

claim

at

once with

the

transportation

companyand

promptly

notify the

nearest

General

Electric

Apparatus Sales

Office.

Reasonable

care

should

be

exercised

in

un-

packing

the

relay

in

order

that

none of

the

parts

are

injured

or

the

adjustments

disturbed.

If

the

relays

are

not tobe

installed

immediately,

they should

be

stored

in

their

original

cartons

in a

place

that

is

free

from

moisture,

dust

and

metallic

chips.

Foreign

matter

collected

on the outside of

the

case

may

find

its

way

inside

when the

cover

is

removed

and

cause

trouble in the operation of the

relay.

DESCRIPTION

The

Type ACR

relay

consists

of a synchronous

driving

motor,

a

gear

train

and

cam

shaft with

reset

spring

driven

through a crown

gear

dutch

4

with a magnetic clutch

release,

and

a

series

of

cam-operated

switches for

initiating

reclosures

and

reset

and

performing

the

various

auxiliary

functions

essential

to the

operation

of the

relay

.,

and

circuit.

A two-position

interlocking

unit and

an

auxiliary

anti-pump unit

are

also

included in

the

relay.

The mechanism

and

units

are

assembled

in

the

size

S-2

case.

A Photograph of the

relay

in

its

case

with

cover

in

place

is

shown on the

cover

of

this

Instruction

Book. The

series

of photographs in

Fig.

1 shows

the prinCipal

parts

in the

relay

and

their

relative

positions in the

assembly.

All

units

and

parts

are

identified

by

the

nomenclature

or

device

numbers

used

throughout

the

text.

CASE

The

case

is

suitable for

either

surface

or

semi-flush

panel mounting and

an

assortment

of

hardware

is

provided for

either

mounting. The

cover

attaches

to

the

case

and

also

carries

the

reset

mechanism

when one

is

required.

Each

cover

screw

has

provision

for

a

sealing

wire.

•

The

case

has

studs

or

screw

connections

at

both ends

for

the

external

connections. The

electri-

cal

connections between the

relay

units

and the

case

studs

are

made through

spring

backed

contact

fingers

mounted in

stationary

molded

inner

and

outer

blocks between which

nests

a

removable

con-

necting plug which completes the

circuits.

The

outer

blocks,

attached

to the

case,

have

the studs

for

the

external

connections, and

the

inner

blocks

have

the

terminals

for

the

internal

connections. •

The

relay

mechanism

is

mounted in a

steel

framework

called

the

cradle

and

is

a complete unit

with

all

leads being

terminated

at

the

inner

block.

This

cradle

is

held

firmly

in

the

case

with a latch

at

the top and the bottom and by a guide pin

at

the

back of the

case.

The

cases

and

cradles

are

80

constructed

that

the

relay

cannot

be

inserted

in

the

case

upside down. The connecting plug,

besides

making the

elecirical

connections between the

re-

spective

blocks of the

cradle

and

case,

also

locks

the

latch

in

place.

The

cover,

which

is

fastened to

the

case

by thumbscrews, holds

the

connecting plug

in

place.

To draw out the

relay

unit,

the

cover

is

first

removed, and the plugs drawn out. The

latches

are

then

released

and the

relay

unit

can

be

easily

•

drawn out. To

replace

the

relay

unit,

the

reverse

order

is

followed.

A

separate

testing

plug

can

be

inserted

in

place

of the connecting plug to

test

the

relay

in

place

on

the panel

either

from

its

normal

source

of power

or

from

other

sources.

Or, the

relay

unit can be

withdrawn

for

testing

and

replaced

by a

spare

relay

unit.

INSTALLATION

LOCATION

AND

MOUNTING

The

relay

should be mounted

on

a

vertical

sur-

face in a location reasonably

free

from

excessive

•

(

•

RES.

(OPER)

(.HEM

USED)

z

2 , 6 8

10

flED

.lJ.IPER

1I0TE

2

NOH

1-

JUIfPU

REQUIIiED

8UWEE.

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" 17

FOR

IIiIMEDIATE

I"ITIAL

IlECLOSUIIE:

BnWHN

1)

00

12

FOil

DHAYEO

INITIAL

RECLOSUIIE.

NOTE

2_

COItlYO_

COMII(CTIOM

OF

"'RS·

AYAllABLE

TO

88TAIII

.10

11.0.

011

II.C.

COIiTACT

BY

ITS

CONIIECTIOII

TO

STUD'

011

10.

BY

~1.IotP(1I

Fig.

2A

(362A57l-5)

Internal

Connections

for

Relay

Type

ACRllB

heat,

moisture,

dust

and

vibration.

The

relay

case

'IllLy

be

grounded, if

desired,

using

at

least

No.

12

3"

S gage

copper

wire.

The

panel

drilling

for

the

ACR

relays

is

shown in Fig. 10.

CONNECTIONS

The

internal

connections for the Type

ACRllB

and

ACRllC

relays

are

shown in Fig. 2A. All

con-

tacts

are

shown

as

they

are

with the

relay

com-

pletely

deenergized

and in Its

reset

position. The

internal

connections

for

the

ACRllE

relay

are

shown In Fig. 2B.

Shorting

bars

are

furnished

between

terminals

1 and 2, and between 9 and 10, to complete the

cir-

cuits

between

these

terminals

if the connection

plug Is withdrawn

from

the

case.

As

described

later,

the

usual

applications of the 179E and 179RS

contacts

connected to

these

terminals

require

short-

ing

bars.

For

other

applications

It

may

be

necessary

to

remove

the

shorting

bars.

An

Internal

jumper

Is

connected between

ter-

minals

13

and

17

on

relays

which have been

adjusted

at

the

factory

for Immediate

initial

reclosure.

On

relays

which have been

adjusted

for

delayed

initial

reclosure,

the

jumper

will be between

terminals

13

and 12. The

purpose

of

this

jumper

is

to

facilitate

the change

from

immediate

to delayed

initial

re-

closure,

or

vice

versa

as

described

more

thoroughly

'lI1der ADJUSTMENTS.

If

desired,

this

internal

umper

can be

removed

and the

necessary

con-

.1eCtiOnS

made

externally.

A

lead

with

colored

insulation

has

been

used

for

the

jumper

to

facilitate

Identification.

Reclosing

Relay Type ACR GEB-1'186

II({)

JlM'[R

(

S£E

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Fig.

2B

(104A8965-1)

Internal

Connections

for

Relay

Type ACRllE

The

ACRllE

relays

are

normally

shipped with

the motor

circuit

adjusted

for

120 volt operations.

If

240 volt

power

Is used, the

jumper

around the

resistor

in the motor

circuit

must

be removed.

As indicated

In

Figs.

3 and 4 if

DC

reset

cir-

cuits

are

used, then the

AC

supply must be removed

whenever the

DC

supply

is

removed.

PRINCIPLES OF OPERATION

GENERAL

The basic

operating

principles

of the Type

ACR

reclosing

relay

will be explained with the aid of the

schematic

mechanical

diagram

shown

In

Fig. 5. Note

that

this

diagram

shows the components

In

neither

their

exact

relative

pOSitions,

nor

to

scale.

Al'lo included in the Type ACR relay, but not

shown

In

Fig.

5,

are

a two-position Interlocking

unit 179E and a telephone type

auxiliary

relay

179Z.

The 179Z unit Is

used

as

an

anti-pump unit.

The 179E

unit

(shown in photographs 1B and

lC)

Is a

specially

constructed

Interlocking

relay.

The

assembly

consists

of

two telephone type

relays

called

"operate"

and

"reset"

mounted

side-by-slde.

The

armatures

of

these

two

relays

are

mechanically

Interlocked by a latching

arrangement

located

be-

tween the two

relays.

This

interlock holds the

relay

in

either

the

"operate"

or

"Reset"

position

depending upon which unit was energized

last.

The

electrical

connections

are

such

that

as

one

of

the

units Is

energized

Its coll

circuit

Is

Interrupted

by the contacts on the adjacent unit

by

the

action

5

if

r

o·

'OEB-1'186 Recloslng Relay Type

ACR

6

13

SEE

NOTE*-"

'A"7

JK

179E

ESET

I

SEE

-<,,).

NOTE

~!jf='-:

-+--~

10

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'B'

152

cc

19

16

I

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r - - - -

..L.I------!C::JJ--

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SWITOi,

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DENOTES

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1.7

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- -

_J

(-J

LEGEND

101 CllNTIIlt.

SWI

TOi

a3A

'

RECLOSER

OJTOUT

SWITOi ' IFUSED

152,

POWER

CIROJIT

BREAKER

/JDTf!:

SEt

SHe,I!"

2..

~

..

152 aI a

112

•

IUXI

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ARY

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IT

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I S

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OPERATING MEOI.610

SM

I S IN

ENERGIZED

OR

OPERATED

POSITION.

152b

•

AUXILIARY

SWITOi.

CLOSED

v.tiEN

CIROJIT

BREN<ER

IS

OPEN

152CC

CLOSING

COIL

152LC

lATOt

OtEO( ING

SWI

TOi.

a.OSED

VtHEN

CI

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IS

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MOTOR.

oPEeATEO

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e.e.

co

... .., rcTI<1US

152X

152Y •

179 •

179E

17!IM

IHR

CLOSING

RELAY

179AB·BC·

OaA'I'EO REQ.09.JRE

SWI

TOt

OPERATED

BY

CLOSI

NG

RELAY

IUXI

LI

ARY

RECLOSING

RELAY.

TYPE

ACR

INTERLOCKING

UNIT

SYNOiRONOUS

M011lR

CLU

TOi

REL

EASE

UN

IT

179Z

>NTI.P\M'

UNIT

179M;

179

DE

179Gi.HI.

179JK

179RS

RESET

SWI

TOi

FRONT

CJoMS

LIMIT

SWITCH.

RESET

OP:RATED

BY

L1MI

T

SWI

TCH.

LOCKOUT

XlliARY

OM

ALA'"

5\\1

TCH

SHAFT

ADJUSTABLE

IUXILIARY

SWITCH

(CNj

BE

SET

11l

CLOSE

IN

BOTH

RESET

>NO

LOCKOUT

•

BUS

DIFFERENT

IAL

LOCKOUT

RELAY.

186

NOTE

'A'

,

INTE~AL

JLM'ER

BETWE9I

13·17

FOR

''''''EDIATE

INITIPL

RECLOSURE

•

INITIPL

RECLOSURE:

SHIFT

11l

12.13

FOR

DELAYED

• -

CIlNTACT

'AB'

HELD

CLOSED

IN

RESET

POSITION

BY

CIM

FOR

''''''ED'ATE INITIPL

RECLDSURE:

THIS

AOJUSlIoIENT

NOT

NECESSARY

FOR

DELA"ED

INITlPL

RECLOSURE.

'Gi'

OPERATES

5.10

SECIlNDS

FROM

END

OF

TRAVEL:

'RS'

OPERATES

SLIGiTLY

AHEAD

OF

·Gi·.

v.tiEN

MOTOR

R£STARTS. 'RS'REMAINS ct,OSED UNTfL

......

I S

OPERATED

BY

FLAT

ENDED

CIM.

.NOTE

'B':

ctNotON

CIlNOECTION

OF

'R5'

AVAILABLE

TO

OBTAIN

A N.O.OR

N.C.

CONTACT

BY

ITS

CIlNNECTION

TO

SlUD t

OR

to.

NOTE

'C':

REMOVE

A·C

SUPPLY

WHENEVER

D.C

SUPPLY

Fal

179R IS

REMeWED,

WITH

PC

R.!.!IIt'T C

IRCvl"~,

Fig.

3

(362A572.l5)

Elementary

Diagram,

Typical

Application

of

Relay

Type

ACR

Used

with

Solenoid

Operated

Circuit

Breaker

•

(

•

"

Recloslng Relay Type ACR

GED-17BS

(X)

5

171E

T

179

Gil"

:f'~'

8

15

,,,,..

pEs.

R'1tf

NCR

II

E.

""'.....

~.ly

I

152

V,C

179

JK 179

171E

\

RESET \

179

ISEE

-<-NOTE

10

11!,

V·aJ •

18

R

'B'

DE

'

179 I ,

AS

I'

I,

!2!.

2

179

3 9

r-

- - - - t

.+-----{C]}--

...

_.J

(Y)

L

"7

12 179

Z

I CIlNTADI. SWIT01,

MODEL

1858IB12

I

'x'

DENOTES

CONTACT

CLOSED

.

NOIfoIR.

NOIfo!R.

(DjTACT

CLOSI

;:.~~

¢rJER

TRIP

I'

179E I

R.AlHI

OPER. I

I

152Y I

11

I

(-)

152Y I

___

...J

101 •

CONTADI.

SWIT01 179 •

143A •

RECLOSER

aJTOUT SWIT01 I

FUSED

179E •

152

•

POWER

CIROlIT

BREAKER

179M

•

15ZII

A

12

• AUXILIARY SWIT01.

CLOSED

WHEN

CIRCUIT

179R •

~ER

1>l1

l I

t--1to

2

oH·<»J

X

x

P.Kl~ul

I• • x

x x

REQ.OSING RELAY,

TYPE

ACR

INTERLOCKING

UNIT

SYN01AONOUS

MOlOR

CLUTCH

RELEASE

UN

IT

y

X

BREAKER

I S

CLOSED.

152111 •

aJT·OFF

SWITCH,

OPERATED

BY

PISlON

152842

• OJT.OFF

SWITOi.

OPERATED

BY

LATOi

152b.

AUXILIARY SWITCH.

CLOSED

"'EN

BREAKER

152bd.

AUXILIARY SWITCH,

CLOSED

"'EN

BREAKER

179Z • ANTI

PUMP

UNIT

OF

179

179AB.BC •

DELAYED

RECLOSURE

17_

•

RESET

SO'T01

SWITCH.~

OPERATED

BY

J

FRONT

CAMS

IS

(PEN

1790£

•

LIMIT

SWITOi.

RESET

IS

OPEN,

\79GH.Hl

LIMIT

SOIT01,LOCKOUT

CAPABLE

OF

FINE

AOJUSlMENT,

15ZV.C

•

CDNTROL

VR.VE CLOSING

aJlL

152V.(]).

CONTROL

VALVE CUT.

OFF

(])IL

15lY

• ANTI

PUMP

RELAY

OF

152

179JK • ALAIfoI SOIT01 AUXILIARY

}

OPERATED

BY

179RS.

ADJUSTABLE AUXILIARY SOIT01

eM

SHAFT

(0"

BE

SET

TO

CLOSED

IN

BOTH

RESET

AND

LOCKOUT)

113C •

PRESSURE

CUTOUT.

OPEN

ON

LOW

PRESSURE

TS

• TEST

SWI

T01

189

, PEIfoIISSIVE

CONTROL

OEVICE

OPENED

BY

MANUAL

TRIPPING

186·

BUS

DIFFERENTIAL

LOCKOUT

RELAY•

OEVlCE ON,

MECHANI~

(HAND

RESET

10

CLOSE)

NOTE

'A'

•

INTE~R.

JUMPER

BETWEEN

13.17

FOR

IMMEDIATE

INITIAL

RECLOSURE:

SHIFT

TO

12.13

FOR

OELAYED

I NI

TI

AL

RECLOSURE

•

• •

CONTACT

'AB'

HELD

CLOSEO

IN

RESET

POSITION

BY

CJN

FOR

IMMEDIATE

INITIAL

RECLOSURE:

THIS

ADJUSlMENT

NOT

NECESSARY

FOR

DELAYED

INI

TI

AL

RECLOSURE.

'GH'

OPERATED

5.10

SE(DjDS

FROoI

END

OF

TRAVEL:

'RS'

OPERATES

SLI

GHlLY

AHEAD

OF

'GH',

IIHEH

MOTOR

RESTARTS'RS'REMAINS

CLOSED

UNTIL

'!II'

IS

OPERATED

BY

FLAT

ENDED

CAM,

NOTE

'B':

CIMION

CONNECTION

OF

'RS'

AVAILABLE

TO

OBTAIN A

N,O,

OR

N.C.

(])NTACT

BY

ITS

<JltoNECTION

TO

STUD 9

OR

10.

NOTE

'C':

REMOVE

A.C

SUPPLY Wf£P£VER

D·C:

SUPPLY F(JI 179R

IS

REMOVED,

W1TI-l

0<

RESE.T

CIRCUITS.

Fig,

4 (376A<)87-l2)

Elementary

Diagram,

Typical

Application

of

Relay

Type

ACE

Used

with

Pneumatically

Operated

Circuit

Breaker

.,

GEH-~786

Recl68lng Relay Type ACR

SWITCH

FUNCTION

OPERATED

BY

LOCATION

AE-BC

Delayed

Reclosure

Front

Cams

Front

Plate,

Upper

Right

MN

Reset

Front

Cams

Front

Plate,

Lower

Left

DE

Limit

Switch

Reset

Cam

Shaft

Right

Rear

GH-HI

Limit

Switch

Lockout

CamShaft

Left

Rear

JK

Alarm

Cam

Shaft

Right

Front

RS

Spare

Cam

Shaft

Left

Front

R

Clutch

Release

Seal-In

Clutch

Armature

Rear

Lover

Center

Fig.

5

(362A676-l)

Schematic

Represen-cation

of

the

Operating

Mechanism

in

the

ACR

Type

Relay

of

the Interlock. At the

same

time,

the

circuit

for

other

unit

is

set-up

by

the

contacts

of the

unit

operated.

Driving

torque

is

transmitted

from

the

syn-

chronous

motor

through a

crown-gear

clutch

con-

sisting

of a

driving

member

pinned to the

motor

shalt,

and

an

idler

member.

The

idler

member,

which Includes a

star

cam

and a pinion,

is

free

to

slide

back

and

forth

on the

motor

shalt

and

is

nor-

mally held In engagement with the

stationary

mem-

ber

by a

compression

spring

which

is

a

part

of the

clutch

release

seal-in

switch.

This

compression

spring

acts

to hold the clutch

release

armature

in

a

position

which

forces

the

idler

member

against

the

stationary

member

of the clutch. The pinion

on the

idler

member

drives

gear

"A", which

is

pinned to the

auxiliary

cam

shalt,

causing

a wind-

up of the

reset

spring.

The

auxiliary

cam

shalt,

which

turns

through slightly

less

than 360

degrees

d'll"ing a

complete

operating

cycle

of the

redosing

relay,

carries

depressions

in

its

body which

operate

the

roller-actuated,

snap-action

switches

"GH-HI",

"DE",

and

"JK"

,

performing

auxiliary

functions

which will

be

described

later.

The

auxiliary

shalt

also

carries

an

adjustable

cam

segment

which

can

be

set

to

operate

switch "RS"

at

any

desired

point

in

the

reclosing

cycle.

The

front

dial

hub

is,

In

turn,

driven

through

the

gear

pair,

"B"

and

"C",

and

makes

slightly

less

than

•

half

revolution

during

a complete operating

cycle

'lie

reclosing

r$Y.

The dial hub

carries

a

set

adjustable

cams,

"D" and

"E".

These

cams

""nsist

of round,

flat

plates

with

either

two

dia-

metrically

opposite

projections

in the

case

of

"D"

8

or

a

single

proj

ection

in the

case

of

"E".

There

are

three

single

ended

"E"

cams.

One of these

cams

is

normally

set

to hold the

"AB-Be"

switch in the

closed

position,

for

the

purpose

of setting up the

circuit

for

immedlate

Initlal

reclosure.

The

other

two

are

set

back-to-back,

providing in effecta

single

cam

projection

which

is

used to operate the "MN"

switch, following

the

immediate

reclosure.

This

latter

setting

determines

the

time

Interval between

the

immedlate

initial

reclosure

and the

~esetiing

of

the

relay,

if

reclosure

is

successful,

as

will be

described

later

in

more

detail. The double-ended

cams

"D",

also

three

In

number,

are

usedto

initiate

delay

reclosures

and

to

reset

the

relay

following

successful

delayed

reclosures.

One

end of the

cam

operates

switch

"AB-Be",

initiating a delayed

re-

closure.

The

other

end

of

the

same

cam

operates

switch "MN" a

short

interval

later,

causing the

relay

to

reset

if

the

reclosure

is

successful. The

Interval between a delayed

reclosure

and

reset

Is

determined

by

the

location of switch "MN" in

relation

to

the

reclosing

switch

nAB-Be",

and thus

will be the

same

for

all

delayed

reclosures.

A

third

type of

cam,

designated

as

"F",

is

keyed

In

position

on the dial hub. Its function

is

to

operate

switch

"MN" and

initiate

reset

of

the

reiay

after

a manual

reclosure

of

the

breaker,

with the

relay

in

its

locked-out

position.

Resetting

of

the

relay

is

accomplished by

en-

ergizing

the

coil

of the

clutch-release

unit 179R,

which

attracts

the

release

armature

and

draws

the

idler

member

of the clutch away from the fixed

driving

member.

This

permits

the

gear

train,

cam

shalt

and

dial

hub to

return

to the

reset

•

l

•

Reclosing Relay Type

ACR

GEB-1786

~

'''''"T(

"''0'.",

~

/

.;"'"

""""~""'"

,,",m'Z.::

.•

'"

,.,

j

. I

1111(.

:01'(

~

«'U

.".

-

0'[1

_

I("T

~l\

"C.

-----+0_11

Ife,

..

'"

en

'"

" I

I

" ,

,

,.

:

" I

I

..

I

..

,

..

lIt!

I

"

..

cl,

I I

i I

, I

,

I I

I

I ;

I

" ,

"

.",

I"

.

,

-

.

,

;

I :

r-l

:--~D

H:,_

r"!'

He.

--0

......-1011(,_

1""-,0

':C,_

...,

.,..

'"''

I'''!'

'''fo

/:...

I

/.,

/,..

I

"-l""''''

'01""

..

'",

••

,,"

.,",

O.

'(r.'.

,01"""

TO

,.At.ll

~I~

~

Fig.

6 (362A6l3-7) Sequence :Diagram

for

Type

ACRllB

and

ACRllE

Reclosing

Relays

position

under

the influence

of

the charged

reset

"pring. During the

reset

cycle the escapement

lllower

retards

the motion of the

star

cam,

re-

.ucing the

reset

speed to a point where

there

will

be

no

rebound when the

reset

position

is

~eached,

The clutch

release

unit

is

equipped with a

seal-in

contact to shunt the

reset

contact "MN" during the

reset

cycle. A manual

release

rod

is

provided to

permit

releasing

the clutch from the front

of

the

relay

so

that

the

gear

train

can be turned

by

hand.

OPERATION

The functions

of

the

various

components

des-

cribed

above

are

illustrated

by Fig. 3 which shows

an

elementary

diagram

of a typical

circuit

utilizing

the Type

ACR

recloslng

relays.

The diagramshows

the connections

for

an

imnedlate

Initial

reclosure

followed by one

or

more

delayed

reclosures.

All

contacts In the

recloslng

relay,

Identified by the

device function number 179,

are

shown

In

the

posi-

tion they

assume

with the

relay

in Its

reset

position.

When the

relay

ts

connected

for

immediate

initial

reclosure,

it

is

essential

that, with the

relay

in

its

reset

position, switch "AB-BC" be held in Its

operation

position

by one of the

"E"

cam

projection

("AB" closed, "BC" open). This setting Is

des-

cribed

more

fully under ADJUSTMENTS.

IMMEDIATE INITIAL RECLOSURE

When the

circuit

breaker

trips,

the 179Z unit

Immediately energized through the 152b the 101-5

_ontact, and the

"preclosed"

contact 179E1. When

the 179Z unit

operates

it

seals

itself

In

around the

the 179E1 unit and

also

energizes

the 179E

"operate"

coll through the 179E6 contact. The operation

of

the 179E unit

causes

the 179E5 contact to close,

thus completing the

circuit

to the closing

relay

152X

through the

seal-In

contact 179Z1. The operation

of

the 179E unit

also

opens the 179E1 and 179E6

con-

tacts.

It

further

sets

up

the

reset

circuit

through

179E2 and

starts

the timing motor throughthe 179E3

unit.

With this

arrangement,

the operating timeof the

179Z and 179E units Is Included in the total

re-

closing time of the

breaker.

The

initial

reclosure

can be initiated

directly

through the

"preclosed"

contact 179E1,

If

the 179E5 contact Is by-passed,

by placing a

jumper

between

terminals

18

and 19.

When the

breaker

closes, the 152b contact

opens, and the 179Z unit will drop out when 152X

"a"

opens, thus providing an anti-pump

feature.

As soon

as

the

motor

starts,

contact "AB" will open

and "BC" will close, setting up the

circuit

for

subsequent delayed

reclosures

In

the

event

that

the

first

reclosure

Is unsuccessful.

RESET

A

short

time

after

the

start

of the timing cycle

contact"MN" Is

operated

by the Single-ended

cam

"E"

as

previously mentioned.

If

the Immediate

Initial

reclosure

was successful, the 152al switch

will be

In

Its

closed

position and the clutch

release

unit 179R will be energized through the contact

179E2. During the

reset

Interval, the 179R unit

is

sealed

In

arOund the "MN" contact. When the

reset

position Is reached, the "DE" contact

will

close,

9

GEH-1786 Reclosing Relay Type

ACR

energizing

the

"Reset"

coil of 179E. The clutch

.

release

unit 179R

is

released

by the opening of the

179E2

contacts.

The

reclosing

relay

is

now

ready

•-

initiate

an

immediate

reclosure

in the event of a

sequent opening of the

circuit

breaker.

vELA

YED RECLOSURES

If

the

circuit

breaker

trips

again, following the

immediate

initial

reclosure

the open 152al switch

prevents

the

reset

of the

relay

when the "MN"

contact

is

operated

by

cam

"E".

Consequently the

relay

continues to operate until the

first

delayed

reclosure

point

is

reached,

as

determined by the

settings

of the double-ended

cams

"D" on the

front

dial

hub. The anti-pump unit 179Z will pick

up

as

soon

as

the 152b switch indicates

that

the

breaker

has

tripped

again. Consequently, the operation of

the "AB-BC" contact combination ("AB"

closes,

"BC"

opens) by one of the "D"

cams,

completes the

reclosing

Circuit, thus energizing the closing

relay

152X. Even a momentary opening of the 152b switch

will

cause

the 179Z unit to drop out, breaking

its

seal-in

circuit.

Therefore

only one

reclosure

of

the

circuit

breaker

is

possible for each operation

of the "AB-BC" contacts.

When the

cam

projection

passes

and allows

the

"AB-BC" switch to

reset,

the 179Z unit will again

operate

if

the 152b switch

is

closed, thus setting

the

circuit

for subsequent delayed

reclosures.

At a definite time interval of approximately

10

seconds,

after

the operation of the "AB-BC"

'tacts

by a

cam

projection "D", the opposite end

he

same

cam

plate

operates

the "MN" contact

J.

79.

If

the 152al

is

closed the

circuit

responds

as

described

in the section entitled RESET, and the

relay

will

return

to

its

reset

position.

If

the

circuit

breaker

has

retripped

as

the

result

of a

susiained

fault, the 152al switch will be open andthe

relay

will

continue through

its

cycle until the next delayed

re-

closure

point

is

reached, whereupon the sequence

previously

described

Is repeated.

LOCKOUT

If

none

of

the

attempts

to

reclose

the

breaker

is

successful,

the

relay

continues to

operate

until

the lockout position

is

reached. Lockout

results

from

the operation

of

the "GH-HI" switch ("GH"

opens, "HI"

closes)

by

a notch

In

the auxiliary

cam

shaft, and Is indicated by the simultaneousoperation

of the

alarm

coniact

"JK".

In

the lockout position

of

the

relay,

the motor

circuit

Is

transferred

through coniact

"Hr'

to the

152A2 switch. Thus a successful manual

reclosure

of the

circuit

breaker

restarts

the motor which will

run

for

a

short

period

(approximately five seeonds)

until contact "MN"

is

operated by the fixed

cam

"F".

This

completes the

reset

circuit

and

causes

the

relay

to

reset

as

previously

described.

ThE'

operating cycle described above

represents

...,ical setting

of

the

relay.

Many

other

settings

possible

some

of

which

are

described

under

JuJJUSTMENTS. Fig. 6

illustrates

clearly

the

sequence

of

the

cam-operated

contacts

deseribed

10

above. Note

that

the

diagram

shows minimum

allowable

intervals

between the

various

operations•

The

elementary

diagram,

Fig. 4 shows the

application

of

the

reclosing

relay

In

a typical

•.

pneumatic mechanism control

scheme.

The

operat-

ing functions of the

ACR

relay

are

the

same

as

previously

described

for the solenoid operated

mechanism. The two

schemes

are

therefore

similar,

except for the different types of controlling devices

used

In

the pneumatic mechanism to accomplish

its

tripping and

reclosing

operations.

INSPECTION

When

the Type

ACR

reclosing

relay

Is

received,

the following points should

be

checked

prior

to •

installation, with the

cradle

removed from the

case.

Press

in the

manual

release

rod

projecting

through the

center

of the dial plate,

releasing

the

crown-gear

clutch. With the

release

rod held in,

turn

the dial hub by hand through Its complete

op-

erating

range

of apprOximately 180 degrees. The

gear

train

should

operate

freely

against

the

restraint

of the

reset

spring.

The dial

cams

"D" and

"E"

should

operate

the front switches "AB-BC" and

"MN" providing approximately

1/64

Inch

overtravel

of

the

roller

actuator

after

the switch has operated.

When the locked-out position

is

reached, the lockout

and

alarm

contacts on the cam

shaft

will be

heard

operating.

If

the

dial

hub

is

turned

further,

to a point

slightly beyond lockoutl the "MN" switch should be •

operated

by

the fixed 'F" cam.

If

the dial hub

is

now

released,

with the

release

rod

still

pushed in,

the dial hub and

gear

train

should

return

all

the

way to

their

reset

position under the influence

of

the

reset

spring.

If

the

relay

Is to provide Immediate initial

reclosure,

the "AB" contact

must

be closed when

the

relay

is

In

the

reset

position. This

is

ac-

complshed

by

setting

one

of

the single-ended

"E"

cams

to

operate

"AB-BC" when the

relay

resets.

Turn

the dial hub a few

degrees

away from

reset

and check

that

"AB" opens

as

the hub Is turned.

Let

the hub

return

slowly and check that "AB"

operates.

When the

relay

is

in

its

reset

position switch

"DE"

on

the

cam

shaft

should be in the operated •

position. To check this, turn the dial

hub

a few

degrees

away

from

reset

and then

let

it

return

slowly, listening for the click of switch "DE".

The

armature

of the clutch

release

unit Is

accessible

from

the

rear

of the

cradle.

Grasp the

armature

between index finger and thumb and pull

it

against the pole piece, disengaging the clutch.

Check that the

seal-in

switch, 179R, clicks slightly

before the

armature

strikes

the pole-piece.

Release

the

armature

slowly

at

the

same

time turning the

front

dial hub by

means

of

the knurled knob,

so

that

•

the crown

gears

re-engage

on the tips

of

their

.

teeth. The

seal-in

switch should reopen

before

the

tips

of

the teeth meet.

(

•

The operation

of

the interlocking unit 179E

should be checked manually.

Press

In

the

armature

of

the

"operate"

unit (lower unit) and check

that

the

upper unit

snaps

open before the

armature

of the

lower unit

strikes

the pole {llece. Then

press

In the

armature

of

"reset"

unit (upper) and

see

that the

lower unit

snaps

open before the

armature

of

the

upper unit

strikes

the pole piece.

ADJUSTMENTS

The Type

ACR

recloslng

relay

can

be

adjusted

for

either

an

Immediate Initial

reclosure

followed

by

up

to

three

delayed

reclosures,

or

for a delayed

initial

reclosure

followed by

up

to

two

additional

delayed

reclosures.

With

normal

adjustments, each

reclosure

attempt

Is followed

after

a

short

Interval

by

an

operation

of the

reset

switch "MN".

The

front

dial

hub

carries

a total

of

seven

cams

which

are

used

to initiate delayed

reclosures

and to

operate,the

reset

switch.

Three

of

these

are

slngle-

ended

cams,

Identified by a round hole punched In

the

cam

projection;

three

are

double-ended

cams,

each having two diagonally opposite projections;

and one

Is

a single-ended cam, having a flat-topped

projection.

This

last-mentioned cam

is

keyed tothe

dial hub and Its position

is

consequently fixed. All

other

cams

can be

set

at

any point

In

thE'

operating

cycle.

Changes In

cam

settings

are

made

by

loosening

the

three

screws

In

the face of the knurled dial knob

and

turning

the

cam

plates

until the projections

are

In

the

desired

positions.

It

Is not

necessary

to

remove

the

screws,

but

merely

to loosen each one

approximately two full

turns.

The

cams

are

easily

shifted by

pressing

against

the projection

In

a

langentlal

direction,

using a

screwdriver

with a thin

blade. The

cams

are

separated

by

thin

spacers

which

are

keyed to the shaft,

so

that a given

cam

can be shifted without changing the settings

of

other

cams.

Changes in

cam

settings

are

facllIlated

by

removing the nameplate, which

is

held by the four

corner

screws,

although this

is

not absolutely

necessary.

After

any change in cam settings be

sure

that

the

three

screws

In

the dial face

are

securely

tightened.

The following sections

describe

the settings

of the

cams

for

various

reclosing

sequences.

IMMEDIATE

INITIAL

RECLOSURE

If

the Type

ACR

relay

Is to provide

an

im-

mediate

initial

reclosure

following a

breaker

oulage,

It

is

necessary

that a

cam

be

set

to operate the

"AB-BC"

actuator

when the

relay

is

In

Its

reset

position. One of the single-ended

"E"

cams,

Identi-

fied by the hole

In

the projection, can be used for

this

purpose.

The

cam

should be

set

so

that the

"AB" conlact

is

definitely closed In the

reset

posi-

tion, but

so

that

It

opens

as

soon

as

possible

after

the

front

dial

hub

starts

to turn.

There

are

two methods

of

oblalnlng immediate

initial

reclosure

with the Type

ACR

relay. One

scheme

is

typified by the connections

In

Fig. 3 and

has

been

described

Inthe sectionunderOPERATION.

Recloslng Relay Type

ACR

GEH-1786

The

reclosure

Is initiated by the

successive

opera-

tion

of

the 179Z and 179E units. This

scheme

Is

suitable

for

application

on

most

circuit

breakers.

For

some applications where total

recloslng

time

Is

critical,

It

may be

desirable

to

omit

the

179E5 contact

from

the recloslng

circuit.

This can

be accomplished

by

connecting the

"LC"

switch

directly

to

terminal

19. Closure of the 152b switch

will

now

energize the 152X coil Immediatelythrough

the

"preclosed"

contact 179El. The 179Z coil Is

also

energized

at

the

same

time

so

that

the 179E

unit will be operated to

start

the

motor.

The

reset

of the

relay

following a successful

Immediate

first

reclosure

results

from

the

opera-

tion

of

switch "MN" by the cam

projection

"E".

For

this

purpose the remaining two single-ended

cams,

Identified by the hole

In

their

projections,

can be

set

back-to-back, providing

In

effect, a single

pro-

jection. This projection should be

set

to

operate

switch "MN"

at

the

desired

Interval, following the

immediate

reclosure.

A

10

second Interval Is

suggested

andJhe·

l'-elay

wlu

he...set

at

ilie factOry

for

this_unless-Otllerwise specified.

Longer

time

intervals

between immediate

re-

closure

and

reset

can be obtained

If

desired

by

proper

setting

of

the equivalent single projection

"En.

This Interval Is, however,

limited

by the

desired

time

Interval to the

first

delayed

reclosure._,

The

reset

interval

must

always

l:!.e

at

least

five

~/':

seconds

less

than the iriterval to the

first

iJ:J2ayed

:C,,.

recloBlIre. This

is

necessary

to

tnSure t the

c'~

reset

switch "MN" will reopen

before

the delayed

recloslng

switch "AB-BC"

operates.

It

is

not

recommended that the interval between immediate

reclosure

and

reset

be

set

for

less

than ten seconds.

The double-ended

cams

"D" should

now

be

set

to provide from one to

three

subsequent delayed

reclosures

at

the

desired

intervals.

Approximate

settings

can be made by means of the calibration

markings shown

on

the dial plate.

For

example,

If

two delayed

reclosures

were

desired,

one

at

30 and

one

at

90

seconds, one of the "D"

proj

ections would

be

set

to line

up

with the

30

second

marking

and the

remaining

two "D"

cams

would be

set

back-to-back,

lining

up

with the

90

second

marking

on the dial

plate.

It

should be emphasized

that

such

settings

will be approximate. More

exact

settings

can

be

made

If

desired,

by

starting

with the approximate

settings

as

described

and using a

timer

to obtain

a

more

exact adjustment.

The delayed

reclosures

are

each followed In

10

seconds by operation of the

reset

contact "MN"

by the opposite end of the

same

cam

which initiated

the

reclosure.

This Interval between delayed

re-

closure

and

reset

is

non-adjustable.

It

is

set

at

the

factory

by controlling the angular displacement

between the "AB-BC" and the "MN" switches, and

should

require

no

further

attention. The

10

second

I between a delayedrec1psure andaccornpan.!-

-

term

es

the minimum

per-

missible

Interval

of

15

sec

ve

deJayed rec]osUl..es. This allows 5

seconds

between

operation of the

reset

switch "MN" and of the

recloslng

switch "AB-BC" for the next delayed

11

GEH-1786

Reclosing

Relay Type ACR

reclosure.

Under no

circumstances

should

the

interval

between

successive

delayed

reclosures

be

reduced

to a

point

where

the

reset

switch "MN"

is

etlll

closed

when

switch

"AB-BC"

is

again

operated

initlate

the

reclosure.

Where

time

settings

are

not specified,

relays

will be

adjusted

at

the

factory

for

immediate

inltlal

reclosure

followed by two delayed

reclosures,

with

automatic

reset

following

each

reclosure

if

it

is

successful.

For

this

setting,

an

internal

jumper

will

be

connected

between

terminals

13

and

17

as

shown by the

solid

line

in Fig. 3.

If

It

is

later

desired

to

change to delayed

initial

reclosure,

this

jumper

should

be

shlfted

as

described

under CHANG-

ING

INITIAL RECLOSURE.

OELAYEO INITIAL RECLOSURE

When a

delayed

Initial

reclosure

is

desired,

the connections

are

slightly different

from

these

shown in

Fig.

3. The

internal

connection

will

be

between

terminals

13

and 12. The closing

relay

(152X)

circuit

should be connected

directly

to

ter-

minal 19, thus

by-passing

conlact 179E5.

The

179E

"operate"

winding will

now

be

energized

immedlately

when the

circuit

breaker

trips,

thus

starting

the

driving

motor

and Initlating the delayed

recloslng

cycle.

The

adjustment

of the

"0"

cams,

for

delayed

reclosures

at

the

desired

intervals,

Is

the

same

as

described

in the

When

the

relay

Is

set

for delayed

initlal

re-

closure

and

the

first

delayed

reclosure

Is

at

least

'5

seconds,

the

factory

will

also

prepare

the

relay

.

immedlate

Initial

reclosure

by using one of

the

.lgle ended

cams

to

hold"

AB" closed. The

Internal

Jumper

will

be

set

across

studs

12

and

1:1.

This

arrangement

permits

an

easy

transfer

to

immedlate

initial

reclosure

by

merely

shifting the

jumper

to

studs

13

and 17. Of

course

if a change to a

initial

delayed

reclosure

of

less

than

15

seconds

is

re-

quired,

it

will

become

necessary

to

relieve

the

single

ended

cam

from

holding "AB" closed and

line

It

up with one of the

"0"

cams.

MINIMUM OELAYEO INITIAL RECLOSURE

The

relay

can

be

adjusted

for

a minimum

de-

layed

reclosure

of approximately

2-1/2

seconds.

In

making

this

setting

first

be

sure

that the

gear

train

is

In

its

fully

reset

position. Also be

sure

that

the two

sections

of the crown

gear

clutch

are

fully engaged.

It

may be

necessary

to disengage

the

cluch manually and

turn

the

motor

shaft,

by

mo-

menlarily

energizing

the

motor

coil before

this

condition

can

be

realized.

One of the double-ended

cams

"0"

should then

be

set

so

that

it

partially

operates

the

roller

actuator

of

switch

"AB-BC".

When the

motor

slarts

follow-

ing the opening of

the

circuit

breaker,

the

"AB-BC"

switch

will

operate

in

about 2

-1/2

seconds. The

cam

adjustment

must

be

such that the

"AB-BC"

switch

will

open when the

relay

has

reset

following

-eclosing

sequence.

It

is

this

requirement

which

armines

the

minimum

value of

reclosing

time.

"Ice

the

crown

gear

clutch does

not

always

com-

pletely

re-engage

when the 179R

armature

is

12

released

following automatic

reset,

the minimum

reclosing

time

will

vary

up to

3/4

second

above the

2-1/2

second

figure.

Connections used with

this

setting

wtll

be

the

same

as

those

for

the

normal

delayed

inittal

re-

closure.

CHANGING INITIAL RECLOSURE

The change

from

immedlate to delayed initlal

reclosure,

or

vice

versa,

can

be

easily

accomplished

on

the

Type ACR

relay

without

recourse

to

ex-

tensive

mechanical

adjustments

in

the

relay.

Whether

the

first

reclosure

is

immediate

or

delayed

is

determined

mainly

by

the connection of

conlact

179El

in the

reclosing

circuit.

If

the

relay

is

adjusted

at

the

factory

for

immedlate

initial

reclosure,

the

internal

jumper

will

be

connected between

terminals

13

and

17,

as

shown

in

Fig. 3, and a

"E"

cam

will

be adjusted to

hold "AB" closed when the

relay

is

in

the

reset

position.

A subsequent change to delayed

initlal

reclosure

Is accomplished by

removing

the

relay

cradle

from

the

case

and

reconnecting

the

jumper

between

termlnals

12

and 13. A

brightly

colored

lead

has

been

used

for the

internal

jumper

to

aid

in

Identification.

If

the Intial delayed

reclosure

is

to be

at

15

seconds

or

more,

no

further

adjustment

Is

required.

For

initlal

delayed

reclosures

or

less

than

15

seconds,

the

three

single-ended

cams

"E"

should

be

grouped

together

and

set

directly

behind one of

the

"0"

cam

projections

so

that

they will

perform

no function in the

reclosing

cycle.

If

the

relay

is

originally

set

for

delayed

initlal

reclosure,

the

internal

jumper

will be connected

between

terminals

12

and 13.

It

should be shifted

to

13

and

17. The single-ended

cams

"E"

should

be

rearranged

as

follows: One

cam

should be

set

to hold the "AB" contact

closed,

when the

relay

is

in

its

reset

position. The

remaining

two,

set

back-to-back

should be adjusted to

operate

switch

"MN"

approximately

10

seconds

from

the

start

of the

cycle.

This

provides

for

reset

after

a

successful

Initial

reclosure.

These

adjustments

have been

more

thoroughly

discussed

under

IMMEOIATE

INITIAL RECLOSURE.

The

internal

jumper

has

been

employed to

factlitate

the change

In

initial

reclosure.

Thechange

in

connections

can

be made on

the

internal

relay

connection block.

It

is

not

necessary

to change

connections on the back of the

panel.

OMISSION

OF QUICK RESET

For

some

applications,

it

may be

desired

to

omit

the

quick

reset

feature

following a

successful

immediate

reclosure,

or

possibly

after

certain

of

the

delayed

reclosures.

This

may

be

necessary

on

applications

where

the

operating

time

of the

protective

relays

for

minimum

fault

conditions

is

longer

than the

reset

interval

of

the

ACR following

the

attempted

reclosure.

This

can

be

accomplished

by

proper

adjustment

and

coordination

of

the

•

r

•

(

•

l

single-ended

cams

with

respect

to the immediate

rec10sure

and

to

the double-ended

cams.

Assume,

for

example

that

the

requirement

is

for

an

im-

mediate

reciosure

followed by

delayedreclosures

at

15

and 60

seconds,

with the

reset

omitted, follow-

ing the

first

and second

reclosures.

The immediate

reclosure

is

obtained

as

previously

described,

with one of

the

single-ended

cams

"E"

set

to

operate

"AB-Be"

in

the

reset

position. The remaining two

single-ended

cams

should

be

set

back-to-back

at

the

15

second

dial

marking to initiate the

first

delayed

reclosure.

The

three

double-ended

cams

"n"

set

back-to-back

and lined up with the

60

second dial

marking,

provide

the

third

and final

reclosure.

Note

that

with

this

arrangement,

the

,,?tnt'"

switch

is

not

operated

after

the

first

two

reclosures

i and hence

the

relay

will not

reset

whether the

rec

osures

are

successful

or

not.

No

provisions

are

made to

omit

the

reset

attempt

following final delayed

reclosure.

MINIMUM

nELA

YEn

RECLOSURE INTERVALS

In

a

it

was stated

that

the

minimum

interval

between immediate and

first

delayed

reclosure

and between subsequent delayed

reclosures,

was

15

seconds. This

is

true

if

a

reset

attempt

is

made following the immediate

reclosure

and

each

of the delayed

reclosures.

Shorter

in-

tervals

are

possible

if

the

reset

feature

is

omitted

and the

single-ended

cams

are

adjusted

properly.

As

an

example,

assume

that

the initial

reclosure

is

to

be delayed,

occurring

after

five seconds, and

that

two additional

reclosures

are

desired

at

fi.ve

second

intervals.

The 179El contact

is,

of

course,

con-

nected

as

previously

described

for delayed

initial

reclosure.

The

reclosures

at

5 and

10

seconds

are

obtained by

setting

a single-ended cam

at

each of

these

positions

on the dialplate. The

third

reclosure

at

15

seconds

is

obtained by setting the

three

double-ended

cams

"n"

and the remaining

"E"

cam,

back-to-back

at

the

15

second dial marking.

The

dial

markings should be used only

as

a

reference

setting,

and

more

accurate

adjustments

made with the aid of a

timer.

It

is

essential

that

the "AB-BC" switch reopen following each

re-

closure.

Note that a

reset

attempt will follow

the

final

reclosure

by 10 seconds.

RESET AFTER

LOCKOUT

The Type ACR

relay

locks out, that

is,

its

motor

circuit

is

opened, when the "GH" contact

is

opened

by the

auxiliary

cam

shaft.

When

"GH" opens,

"Hr'

closes,

iransferring

the motor

circuit

through

an

"a"

switch

on the

breaker.

A successful manual

reclosure

following lockout will thus

restart

the

motor. Approximately 5 seconds

later

the "MN"

switch will

operate,

completing the

circuit

to

the

clutch

release

unit 179R, thus causing the

relay

to

reset.

This

delay

in

reset

after

lockout

prevents

improper

reset

of

the Type

ACRllB

relay

if

the

breaker

trips

again

following the manual

reclosure.

Fig.

8 shows, in

chart

form

the wide

variety

Jf

reclosing

cycle

patterns

obtainable with

this

recloser.

From

these

patterns

three

typical

cycles

have been

derived.

Reclosing Relay Type

ACR

00-1786

APPLICATION

CONSIDERATIONS

The Ty))e

ACR

relay

offers

a wide

degree

of

versattlity

hiadjustment

and

application.

In

addition

to

providing

for

the wide choice

of

adjustments

previously. described, the

relay

has

provisions

for

blocking the instantaneous

trip

circuit,

for

selective

reclosing

and

for

blocking

automatic-load

ratio

control

during the reclosing cycle.

It

can

be used

as

a

single-shot

reclosing

relay

and

later

be

re-

adjusted

as

a multi-shot reclosing

relay.

Some of

these

features

are

described in the following

sec-

tions.

Closing Relays.

It

is

essential

that

the

circuit

breaker

solenoid mechanisms have closing

relays

which

assure

complete closure of the

breaker,

even

though the

auxiliary

switch on the

breaker

mecha-

nism

opens before closure

is

complete.

Control Switches. Referring to

Figs.

3 and 4

it

will

be

noted that a four-stage, Type

SB-l

controlswitch

should

be

provided where

these

relays

are

furnished.

This

switch

has

extra

contacts which

prevent

the

ACR

relay

from

reclosing the

breaker

after

it

has

been tripped by means of the

control

switch.

If

tripped

in this manner, the

breaker

must

be

re-

closed

by the control switch before the automatic

reclosing

feature

is

restored.

InterruptiWA Ratings of Power

Circuit

Breakers.

TIle

dera

g

factors

appiYfi\g

to

the tnterrupttrig

ratings

of

circuit

breakers

should be checked for

all

applications of

ACR

relays.

Latch-checking Switches. In

order

to

assure

suc-

cessful

operation

of

breakers

reclosed

by the

ACR

relay

adjusted for immediate

initial

reclosure,

it

Is

necessary

to add a latch-checking switch to all

trlp-

free

solenoid mechanism. This switch completes

the closing

circuit

only

after

the mechanism latch

is

properly

reset

for the

reclosure.

Latch-checking

switches

are

not required for the

non-trip-free

solenoids.

Overcurrent

Relavs. The

protective

relays

that

trip

the

ctrcuit

breaker

must open

their

contacts

before

the

breaker

recloses;

otherwise

the

breaker

may immediately

trip

a second time even though the

fault has

cleared.

Some

of

the

superseded

types

of

induction

relays,

such

as

the IA-201,

are

not

satisfactory

to

use

with the

ACR

relay

adjusted for

immediate

initial

reclosure.

Undervoltage Devices. In

order

to obtain full

ad-

vantage of immediate Initial

reclosure,

undervoltage

devices should have a one-or-two second

time

delay.

This

prevents

motor shuidown during the

reclosing

period.

CO-ORnINA

TION

WITH

BRANCH

FUSES

On

some

systems

involving

"multi-shot"

re-

closing

relays,

the main feeder

is

protected

by

a

circuit

breaker

and

the branch

feeders

by fuses.

This

economical means

of

sectlonalizing a

system

requires

that a fault on a branch be

cleared

initially

by

the main

breaker

tripped by a high-speed

relay

unit.

If

the fault persiSts following immediate

13

GEH-1786 Reclosing Relay Type

ACR

reclosure,

it

must

be

cleared

the second

time

by

the

branch

feeder

fuse.

To accomplish this, the

'ltacts

of the

high-speed

unit must be blocked

lowing the Initial

trip-out.

This

transfers

tripping

.0

the main

breaker

to a

time

delay unit and thus

allows

time

for

the

branch

fuse

to

clear.

Contact 4

of the

inter

locking unit 179E can be used for this

blocking function.

This

contact,

which opens when

the 179E

operating

unit

Is

energized,

can be

con-

nected in

series

with

the

instantaneous

trip

circuit

as

shown in Fig.

7.

This

will block instantaneous

tripping

of the

breaker

on

the

first

and subsequent

reclosure!!! thus

providing

time

for the branch fuse

to

clear

tne fault

rather

than the main

breaker.

Instantaneous tripping

can

be reinstated

auto-

matically

when

the

relay

locks

out. This

is

ac-

complshed

by connecting the

spare

switch

RS

In

parallel

with 179E4

contact

and

by

setting the

adjustable

cam

segment

to

operate

the

RS

switch

when the locked-out

position

is

reached. With this

connection,

if

the fault

is

still

present

when the

circuit

breaker

Is

manually

reclosed,

the

trip

circuit

will be

energized

instantaneously.

t--a::::::]

1151-, 1,51-1

151-2151-2151-31,5

1

,-3

INST INST

11i!;T.

Ina

152 T • C.

,

T

"T

179Eli

151-TIME

OVERCLRRENT

RElAY

I~I-INST

-

OVERCURRENT

RElAY

I

NSTANTANEOUS

ATTACHMENT

179Eli-BlOCKING

CONTACT-

RECLOSING

RELAY

152

-

CIRCUIT

BREAKER

Fig.

7 (6556530-0)

Typical

Application

of

the

TJ~e

ACE

Contact-to-Block

Instantaneous

Trip

Circuit

SELECTIVE RECLOSING

In

certain

applications

it

is

desirable

to provide

immediate

initial

reclosing

if

the

circuit

breakers

are

tripped

by

an

Instantaneous

relay,

but to

elimin-

ate

the

immediate

reclosure

and wait for the

first

delayed

reclosure

in the event

that

the

breaker

is

tripped

by a

time

delay

relay.

Such a situation

is

easily

handled with the Type ACR reclosing

relay.

Referring

to Fig. 3,

if

a

contact

of the time' delay

protective

relay

or

an

auxillary,

is

connected

from

the

positive

control

bus to

terminal

12

of

thE!

Type

ACR

relay,

the

inter

locking unit 179E will be

energized

when the

protective

relay

operates.

The

179E unit will

operate

and open the immediate

'lOSing

circuit

before

the

breaker

"b"

switch can

le.

"INGLE

SHOT

RECLOSING

The Type ACR

relay

can

be applied

as

a single

shot

reclosing

relay.

To

accomplish

this, follow

14

the connections shown

In

Fig. 3

for

Immediate

first

reclosure,

using

either

of the

"Immediate

reclosure"

settings

described

underADJUSTMENTS,

adjust

an

"E"

cam

to

close

"AB"

at

reset.

The

"RS"

contact

should be connected in

series

with the

reclosing

circuit,

that

is,

terminals

18

or

19

de-

pending upon the adjustment. With the

usual

factory

adjustments,

the "RS" contact

is

closed

when the

relay

is

reset,

and

closes

again

just

prior

to lockout.

If

all

delayed

reclosure

points

occur

during

the

period

when "RS"

is

open, delayed

reclosures

will

be blocked and

therelaywillfunctionasa

single-shot

recloser.

The

reset

time

of

this

single-shot

re-

closer

can be controlled by the

setting

of the

remaining

two

single-ended

"E"

cams.

If

the

re-

closure

Is

unsuccessful, the

relay

will

run

to

its

locked-out

position

as

previously

described,

and

will

reset

following a

successful

manual

reclosure.

Delayed

reclosures

can be

restored

if

the "RS"

contact

is

by

passed.

FUNCTIONS OF CONTACT "RS"

The

spare

contact "RS" can

be

applied

In

a

variety

of ways. The contact Is

operated

by a

flat

on

an

adjustable

cam

segment,

accessible

through

the opening in the upper contact block on the

cradle.

Normally, the

cam

segment

is

adjusted

so

that

the

"RS"

contact

is

closed

In

the

reset

position, and

opens

shortly

after

the

start

of the

cycle,

and

recloses

just

ahead

of lockout. The

contact

may

also

be connected to be open in the

reset

position

by

transferring

the

red

lead to stud No. 10.

With the

normal

adjustment, the "RS" contact

can

be

used

to block automatic

load-ratio

control

during

the rec10sing cycle.

If

the contact

is

con-

nected

in the

control

circuit,

load-ratio

control

will

be blocked while the Type

ACR

relay

is

running, but

will be

reinstated

when the

relay

locks-out.

The "RS" contact, with the

normal

adjustment,

can

also

be

used

to block the instantaneous

trip

circuit

following the second,

rather

than the

first,

reclosure

if

it

is

connected in

series

with this

circuit.

With

this

arrangement

the

initial

tripout

and the tripout following immediate

reclosure

will

be instantaneous. Tripping

after

subsequentdelayed

reclosures

will be time delay. The Instantaneous

trip

circuit

will be

restored

when the

relay

reaches

lockout.

The "RS"

contact

can

also

be

used

as

a

spare

alarm

contact,

if

the

cam

segment

Is

reset,

so

that

the

contact

operates

just

prior

to the lockout but

Is

not

operated

In

the

reset

position of the

relay.

In

making

adjustments

on

the "RS" contact,

it

should

be

remembered

that

the flat

In

the

cam

segment

Is

dimensioned to hold "RS" contact

closed

for

about

30

seconds

at

normal

shaft speed.

MAINTENANCE

The

relays

have been completely adjusted

at

the

factory

and, except for

adjustments

of the

front

dial

cams

to obtain the

desired

reclosing

intervals,

no

further

adjustments

should be

required.

These

routine

adjustments

are

described

In

the

section

headed ADJUSTMENTS.

In

the event

that

some

of

•

Reclostng Relay Type

ACR

GEH-1786

SINGLE

SHOT

A

INSTANTANEOUS

SINGLE

SHOT

DELAYED

TWO

SHOT

DELAYED

THREE

SHOT

DELAYED

TWO

SHOT-

ONE

INSTANTANEOUS

AND

ONE

DELAYED

THREE

SHOT-

ONE

INSTANTANEOUS

AND

TWO

DELAYED

FOUR

SHOT

-

ONE

INSTANTANEOUS

AND

THREE

DELAYED

SECONDS

0

v

AA

AI\

A

,

F V

F •

F

..

AA

....

A1'.

T

AA

T

I I

10

I,

A,I\

F V "

AI\

F

At'>

F

• v "

F v "

F

AA

F

"'-

....

v

F

~

F A F

'"

T

....

v

I I I I I I I I I j t I ,

20

30

40

50

60

170

180

NOTE:

RESET

AFTER

MANUAL

RECLOSURE

FOLLOWING

LOCKOUT

OCCURS

5

SECONDS

AFTER

RELEASE

OF

CONTROL

SWITCH

TO

NEUTRAL

POSITION.

LEGEND

~

AUTOMATIC

RECLOSURE

~

FINAL

AUTOMATIC

RESET

..

OPTIONAL

INTERMEDIATE

AUTOMATIC

RESET

A

-ADJUSTABLE

INTERVAL

-

MINIMUM

VALUE

5

SECONDS

F

-FIXED

INTERVAL

-

10

SECONDS

X

-LOCKOUT

CHART

OF

AVAILABLE

RECLOSING

PATTERN

CYCLES

OF

THE

ACR11B

RELAY,

SHOWING

MINIMUM

INTERVALS.

0-5-5-5

SEC.

, A V P

'~

15-30-75

SEC.

t'>

C>

• • v

0-15-15-15

SEC.

t'>

A A

, 7 I I

'7'

I i I I

II

I I)

SECONDS

0

10

20

30

40

50

60

120

130

180

TYPICAL

RECLOSING

CYCLES

DERIVED

FROM

ABOVE

CHART

BY

VARYING

INTERVALS

AND

OMITTING

OPTIONAL

RESETS.

Fig.

8 C377Al83-2)

Chart

of

Available

Reclosing

Pattern

Cycles

of

the

ACR

Relays

Showing Minimum

Intervals

15

'GEH-1786 Reclosing Relay Type

ACR

the

permanent

adjustments

are

disturbed during

periodic

testing

or

installation

of renewal

parts,

the

following suggestions will

be

helpful:

SWITCHES

AB-BC

ANDMN

These

switches

perform

the

reclosing

and

reset

functions when

operated

by the

adjustable

cams.

The

switch

and

roller

actuator

are

mounted

on

spacing

blocks which

are

clampedto

the

front

plate

by

screws

passing

through slotted mounting holes.

The "AB-BC" switch

sets

up the reclosing

cir-

cuit

when

operated

by

one of the adjustable

cams.

Its

point of operation,

therefore

must

be

co-ordtnated

with the

time

dial

markings.

The

procedure

to follow

to

confirm

the

correctness

of the switch setting,

is

to

loosen the

three

screws

on the

time

dial hub

sufficiently to

permit

easy

movement of any

of

the

adjustable

cams.

Then with the

relay

in the fully

reset

position, move one of the

cams

toward the

roller

of the "AB-BC" switch. The switch will be

properly

set

if

the

cam

"just"

causes

operation of

the switch,

as

it

engages the

roller

from

the

left

hand

side,

when

its

point

lines

up with the

zero

time

dial

mark.

When

relays

are

set

for

immediate

first

re-

closure,

which

is

the

normal

factory

adjustment,

the "AB-BC" switch

is

held

closed

by one

of

the

single-ended

"E"

cams.

The position of the

cam

is

on the

right

hand

side

of

the

roller

in

this

case,

so

'~'\t

the switch will open

as

soon

as

possible

after

front

dial hub

starts

to

turn.

The

"MN"

block

must

be

adjusted in relation to

"AB-BC"

so

that

"MN"

is

operated

10

seconds

after

"AB-BC". That

is,

the

switch

roller

shouldbe about

10

degrees

in a clockwise

direction

from a line

passing

through the

"AB-

BC"

roller

and the

center

of the dial.

It

is

important

to check

that

the

cams

will cause

the switch buttons to

depress

for approximately

1/64

inch

overtravel

as

they

progress

by the

roller

to

insure

positive

operation. On the other hand, the

overtravel

shoulu not exceed the

total

travel

of

the

switch button, otherwise the

cam

will jam against

the switch.

When the motor

restarts

following a

successful

manual

reclosure

after

lockout, "MN" should

be

operated

about 10 seconds

later

by the flat-ended

cams

"F".

After the final

adjustments,

check that

the points of the

cams

clear

the

rivet

heads on the

actuator

arms

by

at

least

1/64

inch when the hub

is

turned. The manual

release

rod

provides a

con-

venient means of

releasing

the

clutch

sothatthe dial

hub can be

turned

by hand

during

adjustments.

AUXILIARY SWITCHES

A

series

of switches ("DE", "GH-HI",

"JK",

j "RS")

are

operated

by indentations

on

the

~IIXiUary

cam

shaft. The

relative

positions

of

these

switches in the

assembly

are

shown by the

series

of

pictures

in Fig. 1.

16

Normally, the only switch

requtring

adjustment

Is

"RS".

This

Is

a

spare

switchthat can be adjusted

to operate

at

any point in the timing cycle.

It

Is

operated

by

the

flat

on

an

adjustable

cam

segment

fastened to the

auxiliary

shaft

by

set

screws.

This

segment and Its

set

screws

are

accessible

through

the hole in the

upper'

contact block on the

relay

cradle.

All

auxlltary

switches

are

mounted on spacing

blocks, which

are

in

turn

fastened to

either

the

front

or

rear

plates

by

clamp

screws

passing

through

oversize

holes in the

plates.

They have

been

set

at

the factory to provide the operating

sequences

described

underPRINCIPLES OFOPERA-

TION.

Normally, the factory settings of auxiliary

switches "DE", "GH-HI", and

"JK"

should not be

disturbed.

If

adjustments

are

necessary

the follow-

ing sequences

must

be maintained.

Switch

"DE"

must

be closed when the

relay

is

in Its

reset

position. When the shaft operates,

this

switch

must

open

before

"MN" Is operated for the

first

time.

Switching "GH-HI"

determines

the lockoutposl-

tion

of

the

relay.

It

should

operate

about 5 seconds

before the stop on the

targe

back

gear

strtkes

the

fixed stop on the

rear

plate.

Alarm

switch

"JK"

must operate

either

simul-

taneously with,

or

slightly ahead of the lockout

switch "GH-HI".

The setting

described

for "GH-HI" and "JK"

provides the delay in

reset

following a manual

re-

closure,

which was

described

under LOCKOUT.

If

deSired, these switches can be

set

so

that

reset

will occur Immediatelyfollowing a successful manual

reclosure

from

lockout. To accomplish this,

switches should be

set

so

that

"GH-Hr'

operates

just

before the stop

posts

meet, and

so

that

"JK"

and "MN"

operate

just

prior

to this point.

Be

sure

that

all

contacts have the

prescribed

1/64 inch

overtravel,

and

that

all

clamping

screws

are

se-

curely tightened

after

any switch adjustment.

CLUTCH RELEASE

UNIT

178R

The clutch

release

unit should function

as

des-

cribed

in the

earlier

section headed INSPECTION.

The

seal-in

switch

is

attached to a mounting

strip

which in

turn

Is fastened to the

clutch-release

mounting

bracket

by means

of

spacers

and

screws.

These

screws

pass

through

clearance

holes

In

the

mounting

strip

which

permit

adjustment in the

operating point of the switch. These

screws

are

accessible

if

the two fastening

screws

on the lower

cradle

block

are

removed. The block can then be

swung hack

far

enough to expose the

screw

heads.

In

its

ftnal adjustment, the

seal-In

switch should

operate before the

armature

strtkes

the pole-piece

when the

armature

is

operated by the thumb and

forefinger. When the

armature

Is

released,

the

seal-In

switch

must

reopen before the

tips

of the

clutch teeth meet.

This

Is

important since, in the

reset

position, the crown

gears

may not reengage

•

(

•

(

•

(

perfectly,

and

it

is

essentlal

that

the 179R

contact

be

open when the

relay

Is In the

reset

position.

ESCAPEMENT

The

speed

of

the

gear

train

and

cam

shaft

during

reset

Is Hmited by an

escapement

consistlng of a

star

wheel

cam,

fastened

tc

the

idler

gear,

and a

cam

follower. The follower pivots about a lower

bearing

and

is

guided

by

an

upper

bushing

and

washer.

The lower

bearing

has

an

eccentric

mount-

Ing.

screw

which

permits

adjustment

elf

the two

projections

of the follower with

relation

to the

star

wheel.

Normally,

this

eccentric

bearing

should

not

require

adjustment

during the full

life

of the

relay.

1f

the

adjustment

is

Inadvertently

disturbed,

the

bearing

should be

reset

so

that

a line through the

two follower

projections

passes

approximately

through the

center

of the

motor

shaft,

and the

clamp

screw

retightened.

The

relay

should

bEl

operated

through

its

entire

cycle

by

releasing

the clutch and

turning

the

knurled

knob on the

front.

There

should

be

some

play

between the follower

proj

ections and

the

star

wheel

cam

at

every

point In the

timing

cycle.

1f

there

is

any tendency

for

the follower to

bind

or

jam,

the

eccentric

bearing

shouldbe

adjusted

until

the

bind

is

eliminated. Be

sure

that

both

screws

are

securely

tightened

after

adjustments

are

completed.

INTERLOCKING

UNIT

179E

As

previously

described

In the PRINCIPLES

OF

OPERATION, this unit Is a mechanically

inter-

locked device.

The

operation

of the latching

mechanism,

plus

the gap and wipe of the contacts

are

tWO

features

that should be checked.

The latching must be

positive

as

each of the

armatures

are

operated

by

hand. To

,~heck

the

correctnesF

of the adjustment,

place

a 1.5

mil

shim

between the

armature

and pole

piece

and

operate

the

armature

so

that

it

will

bear

against

the

shim.

1f

the

latch'ng

is

positive

under

these

cir-

cumstances,

the mechanical

interlocking

is

satis-

factory.

To

confirm

the contact

adjustment,

first

see

that

all

the open contacts have

at

least

a 0.02 inch

gap. Second, check the wipe on

all

the

closed

con-

tacts,

by

depressing

the

stationary

contact

members

and noting

that

the movable

members

follow

for

at

least

a 5

mil

deflection.

Third,

check the

contact

wipe on

those

contacts

that

close

when the

a,rmatures

are

operated,

as

follows:

Place

a two mil

shim

between the

armatur~

and pole

piece,

and hold the

armature

in the pickea

up

position.

1f

the

contacts

are

closed

under

these

conditions, the

resulting

wipe will be adequate when the

shim

is

removed.

Finally,

check

to

see

that

these

same

contacts

uinta

in

their

wipe when held

closed

by the latching

rrangement

alone,

by

deflecting the

stationary

members

as

described

above to

see

that

a five

mil

wipe

is

present.

Reclosing

Relay

Type ACR GEH-1786

PERIODIC INSPECTION

It

is

suggested

that

mechanical

Inspection

of

the

relay

be

made once

every

six

months. The

relay

should be

turned

by hand through Its complete cycle

and the

operating

sequence

of the

auxlltary

switches

checked with

reference

to the

detailed

description

given above. The clutch should

be

released

manually

with the

relay

in

the

locked

out

position

to be

sure

that the

mechanism

resets

properly.

Thelnterlock-

Ing unit should be

operated

by handIn both

directions.

CAUTION:

After

any

mechanical

inspection of

the relay, be

sure

that

the

Inter

locking unit 179E Is

In

its

reset

position

before

the

relay

is

replaced

In

Its

case.

When

reset,

the

armature

of

the

upper

unit should be latched in

•

PERIODIC TESTING

TIME CHECKS

When

the

relay

Is

installed,

recloslng

Intervals

may be

desired

which

differ

from

the settings

originally made

at

the

factory.

1f

the approximate

settings

indicated by the

numbers

on the dial

plate

are

not

accurate

enough,

more

exact

settings

may be

made

by

following the

circuit

In Fig. 9

and

the

des-

cription

which follows. The

relay

may be

tested

while In Its

case

at

the

installation

by using

test

(:

@ @

,~~

~--

11

13

15

17 19

12

¥

16

18

20

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1 7 9

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~

10

C ©

i

I

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I .

"-

S2

TYPE

XLA

EST

PLUGS

SOURCE

Jr

RATEC

~OTOR

I"Ol

TS

SOURCE

OF

RATED

CONTROL

'f01,

TO:;

I

RESET

CIRCUIT}

l

1S41

~

L,/~SI

I

'~

SOURCE

OF

RATED

CONTROL

YOLTAGE

CLOSING

CIRCUIT)

11511

A.C.

II /

RESISTOR

TO

/

T T T T

ADAPT

IMER

cu

au

0

VOLTAGE

RATING

OF

CLOSING

CIRCUIT

0 [

p 0 0

i-

0_

1"

..;::~

--

..

"'.

.

STANDA

to.

TYP

TIIofER

TIMER

CLUTCH

COIL

RO

ELEe.

[ AC-l

Fig.

9 (362A672.l)

Test

Connections

for

Relay

l'JPe

ACR

17

,GEH-1788 Recloslng Relay Type

ACR

plugs

and

portable

test

equipment including a

timer,

switches

and a

source

of motor and

control

voltages.

This

scheme

Is

Illustrated

by

Fig.

9. The

relay

can

be

removed

from Its

case

and

replaced

with a

e

relay,

and then checked In the

laboratory

with

...

.,rmanent

test

Installation. Note

that

the

sources

of

rated

voltage

referred

to In the

test

dtagrams

are

the

rated

voltage and frequency shown on the

name-

plate

for

the motor and the

control

circuits.

The following

paragraphs

give the

proper

op-

erating

sequences

used to check the various,

time

Intervals.

1.

Reset

interval

after

Immedlate

recloser-

(a)

Close

81

and 83.

(b)

Pulse

82

(close and open);

this

operates

179E, which

starts

the

ACR

motor and

also

the

timer

(179E4 opens).

(c) Operation of

MN

a

short

time

after

the

start

of the cycle

causes

ACR

to

reset,

and contact 179E4 to

reclose,

stopping

the

timer.

(d) Read time and open switches.

The

timer

reading will

closely

apprOximate the

Interval

between immedlate

first

reclosure

and

ac-

companying

reset

attempt.

It

will be In

error

by

the

short

time

it

takes the

ACR

to

return

to

its

reset

position

and for the 179E4 contact to

reclose.

2.

First

Delayed

Reclosure

-

(a) Close 81.

(b)

Pulse

82; this

starts

the

timer

and

operates

179E which

energized

the

ACR

motor.

(c)

Close

83

and 84

after

interval

for

reset

following immediate

reclosure

has

passed.

(d)

Operation

of

AB

at

first

delayed

recloser

closes

contact

AB

stopping the

timer.

Read this time.

(e) Upon passing

of

the

cam

operating

AB

the

timer

will again

operate

until

MN

is

operated.

(f)

Operation

of

MN

sets

up

reset

circuit

resetting

the

relay.

If

the

relay

Is

set

for delayed Inlttal

recloser

and the "AB" contact

is

not held

closed

whilE'

In

the

reset

pOSition, this step Is not

necessary;

S3

and

84

can

be

closed

in step (a).

3. Second

or

Third

Delayed

Recloser

-

~

al

Close 81.

b

Pulse

82

(starts

motor and

timer).

c After

first

delayed

reclosure

and

reset

pOSition Is

passed,

cloF.e

S3

and

84.

(d)

When AB

operates

for second

recloser,

timer

will stop,

recording

time

to second

(e) A

short

time

later

ACR

will

reset.

(f)

Open switches.

The

time

Interval to the

third

delayed

reclosure

...

1

be

checked by following the

same

prQ(:edure,

but

waiting until

after

the second delayed

reclosure

and

reset

position Is

passed

before

closing

S3

and

84.

18

4. Interval between Delayed Reclosure and

Reset

-

(a)

Pulse

82.

(b)

Close S3,

86

and

81

In this sequence

prior

to operation of the

AB

contacts

for the

reset

interval

to

be

timed but

after

the

Interval

has

passed,

if

any.

(c) Open 86

immediately

after

the timer

has

started.

8tartlng

of the

timer

occursdue

to opening of the

BC

contacts.

(d)

Operation

of

the

MN

contact after

first

delayed

reclosure

will then cause the

ACR

to

reset

and the resultant

re-

closure

of 179E4 will stop the

timer.

While the

sequence

are

given

primarily

to

facilitate

the setting

of

required

time Interval, the

same

circuits

can

be

used for

periodic checking of

time

intervals.

OPERATION CHECK8

The

test

circuit

used

In the previous section

can

also

be adapted

to

checking operating points

of

the

various

units.

A.

Interlocking Unit 179E; Clutch Release

Unit 179R.

Adjust the

control

voltage

sources

to

80%

of

the

rating

shown on

the

nameplate. Set the

source

of

motor voltage

at

80%

of the nameplate rating.

Close

81

and

pulse

(close and open) 82; the 179E

unit should

operate

and the motor should drive the

ACR

through the

complete

cycle to the lockout

posi-

tion. Close

S3

and 85

In

this

sequence. This

restarts

the motor and the dial moves from the

lockout position. A

short

time

later

the

179R

unit

should operate

permitting

the

relay

to

reset.

When

the

reset

position

is

reached, the 179E unit should

also

reset.

Open

83

and check that 179E1 contact

between

terminals

13

and

14

is

closed. This indi-

cates

whether the 179E unit

resets

properly

at

80%

of the

rated

voltage.

Note

that

both the 179E and

179R

coils

are

Intermittently

rated,

so

care

must be taken to

remove control voltage

at

once

In

the event that a

unit does not

operate

properly.

B. Motor

The operation of the motor

at

80%

of

rated

motor voltage was checked In the previous section.

C. Anti-Pump Unit 179Z

Apply

60%

of

rated

d-c

closing

circuit

volts

if

d-c

rated

or

80%

of

rated

closing

circuit

if

a-c

rated

between

terminals

11

and

17

and check

that 179Z

operates.

Do

not

leave

voltage

on

continuously

as

possible damage to the 179E operate coil can

result,

should the 179E

relay

not operate

at

60%

voltage•

Relay 179E should

operate

at

80%

voltage

as

checked In (A).

•

r

•

(

•

l

RENEWAL PARTS

INSTALLATION

The

following

sections

will be helpful

If

it

is

.lecessary

to

install

replacement

parts.

SWITCHES

Any

of

the

cam-operated

switches can be

re-

moved

from

its

spacing

block by taking out the two

small

fastening

screws

passing

through the switch

body.

Before

the

switch

is

removed, take

care

to

notice

the

relative

position

of the actuator

so

that

it

can

be

installed

in

the

same

position with the new

switch. When

leads

are

soldered

onto the

terminals

of

a

replacement

switch, the switch should be

held

in a

horizontal

position

to

prevent

any possibUity

that

solder

will

flow into the switcb mechanism.

Small

fiber

baffles

are

provided to prevent

this,

but

the

added

precaution

is

advisable. Since the

spacing

block

was

not

disturbed,

no adjustment

should

be

required

on

the

replacement switch.

However,

since

there

are

minor differences in

the

operating

points

of individual switches,

It

is

ad-

visable

to

recheck

the

operation of the switches.

The

switches

operated

by the auxiliary

cam

shaft

are

accessible

If

the top

cradle

block

is

swung

upwards.

Since

the

small

clamp

screws

are

not

accessible

on

these

switches,

it will be

neces-

sary

to

remove

the

spacing

blocks. Remounting

of

the

blocks

will

be

facUitated

If

the original position

of the block

is

marked

with a

scribing

tool

or

sharp

"encll

before

the

clamp

screws

are

1')Osened.

,LUTCH RELEASE UNIT 179R

The

clutch

release

magnet and coil

assembly

can be

removed

as

a

unit.

Remove the two

screws

which

clamp

the

magnet to the formed

bracket.

One

coil

lead

is

connected to

terminal

3 and the

other

to

the

reset

coil of 179E. Disconnect

these

leads,

cutting

the

cabling

twine

If

necessary.

The

assembly

can

now

be removed, the replacement

fastened

in position, and

its

leads connected to the

proper

terminals.

Although this change should not

have

disturbed

the clutch

release

adjustments,

it

is

advisable

to

check

the operation of the clutch

as

described

under MAINTENANCE.

MOTOR

Since the

motor

is

not

readily

accessible

it

is

suggested

that

the

following

steps

be followed in

making a

replacement:

A. Removing

the

Motor

1. Be

sure

the

relay

is

in the

reset

position.

2. Remove the

square

nameplate, which

is

held in

place

by

four

corner

screws.

3. Remove the

dial

hub and

cam

assembly by

unscrewing

the button

on

the

release

rod

and

removing

the

slotted

retaining

screw

in

the

center

of the knurled

knob..

Note

that

a

spot-drill

marking

on the

cam

shaft

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

Reclosing Relay Type ACR

GO-I'"

gear

is

aligned with a

similar

marking on

the

dial

hub

gear.

Remove switches

"AB-Be"

and "liN", from

their

spacing blocks.

Do

not

remove

the

blocks. Note the

relative

position

of

the

roller

actuators

in

relation

to the switches

before they

are

removed.

Remove the two

screws

holding the 179Z

unit to the

rear

of

the

front

plate.

Remove the two

screws

holding

the

upper

molded

cradle

block to the

cradle.

The

block can

now

be swung back exposing the

auxiliary

switches and blocks.

Carefully

mark

the

positions

of

the two

front

switch spacing blocks, using

either

a

scriber

or

a

sharp

pencil.

Whlle

this

step

is

not

essential,

It

does

simplify

the

re-

assembly.

Remove the

screws

clamping' the switch

blocks to the

front

plate.

Remove the four

screws

holding

the

front

plate

to the hexagonal doweled spacing

posts.

Hold the hexagonal

posts

against

turning whlle the

screws

are

beingloosened.

The

front

plate

can now be lifted

from

the

doweled

posts

and swung back exposing the

motor.

The

relay

should

be

resting

on

its

back

during

this

and

the

following

steps

so

that

the

various

units,

suspended

by

the

leads,

will

remain

in

their

relative

posi-

tions. Be

careful

not to bend the

release

rod

during

this step.

Cllp the

leads

of the

motor

so

that

the

leads

of the new motor can be

spllced

to them.

Remove the four

screws

holding the motor

plate

in position. The

motor

and

plate

assembly

as

well

as

the

rod

and

its

guide

plate

can

now

be lifted out.

Remove the motor

from

the

plate.

B. Mounting the

New

Motor

1.

Fasten

the

new

motor to the

plate.

2. Mount the

plate

and

motor

on

the four

spacing

posts.

Note

that

the

motor

shaft

must

be guided into the

bearing

hole

in

the

idler

member

and the hole in the

rear

outboard bearing

plate.

The

release

rod

should engage with the

front

surface

of

the

star

wheel.

3.

Place

the front

plate

assembly

in

its

general

position by

threading

the

release

rod

through the hole in the dial hub

post,

at

the

same

time

centering

the

front

cam-

shaft

gear

with the hole in the

plate.

19

-GEB-1786 RecloBing Relay Type

ACR

20

4.

Before

the

plate

is

forced

all

the way onto

the doweled

posts,

the two switch and block

assemblies

should be remountedonthe

rear

of

the

plate

and

aligned with the

scribe

lines.

5.

6.

7.

The

plate

can

now

be

pressed

all

the way

against

the shoulders

of

the doweled

posts,

first

aligning the bearing pin

on

the

cam

shaft

with the hole in the front

bearing

plate.

Replace the four mounting

screws

and tlghten

securely.

Remount

the

179Z unit.

Remount the two

front

switches and

roller

actuators,

being

sure

that the

roilers

are

in

their

origtnal

posltlons.

8. Replace the hub and

cam

assembly, being

sure

that

the

gear

tooth in "B"

gear,

identlfled

by

the spot meshes with

the

simila~ly

identlfled'villey on the "c"

gear.

9. Replace the hub retaining

screw

and knob

on the

release

rod.

10.

Before

the top block

is

replaced, the

relay

should

be

operated

by hand through a

com-

plete

cycle

and the operating sequence of

the

auxiliary

switches checked.

If

minor

readjustments

are

required,

they can be

more

easily

handled with the block

off.

If

the switch operation

ls

satlsfactory,

the

molded block should be fastenedinpositlon.

11. Replace the nameplate.

During the reassembly

steps,

care

must

lie

taken

to

keep

leads

away

from

the moving

parts

ali

to avoid pinching lead insulatlon under blocks

or

plates.

Normally, the

reset

spring

wlll not be

disturbed

during motor replacement,

or

during

other

adjustments.

If

the

spring

shouldlnadvertently

unWind, note

that

with the

relay

in

the

reset

posiUon

the

inittal

windup of the

spring

should

be

approxi-

mately

180

degrees

from the

free

posiUon.

ORDERING INSTRUCTIONS

It

is

recommended that sufficient quantltles

of

renewal

parts

be

carried

in

stock

to enable the

prompt

replacement

of

any

that

become worn

or

damaged.

When

ordering

renewal

parts,

address

the

nearest

Sales Office

of

the

General

Eleciric

Com-

pany, specifying the quanUty

required

anddescribing

the

parts

by

catalogue numbers

as

shown

in

Renewal

Parts

Bulletin

No.

GEF-3801.

•

GE ACR11B User manual

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