Ge Rpm 13a User manual

INSTRUCTIONS

TI

MI NG RELAYS

Types

RPM

13A,

138,

130

...

PM15A, 158,

15C

and

150

POWER SYSTEMS MANAGEMENT DEPARTMENT

G-ENERAL

_

ELECTRIC

PHILADELPHIA,

PA.

GEH-2031B

Supersedes

GEH-2031A

I

11

.1

i1

;1

i

1

j

I

i

GEH-2031 TimiIl,g

Relays

Type

RPM

TARGETS

INNER

CONTACT

OUTER

CONTACT

Fig. I

(8030298)

REAR

MOUNTING

PINION

PAWL

RPM

Relay, Unit

Withdrawn

From

Cas~

(Front

-View)

MAGNETIC

DAMPING

ELEMENT

SET

SCREW

FOR

COPPER

CYLINDER

FRONT

MOUNTING

PLATE

Left Side

Vi

ew

Fig. 2

(8030297)

FRONT

MOUNTING

PLATE

---f-,'J

DRIVING

ARM

ARMATURE

RESET

SPRING

ROTANOID

TY

RELAY

RPM

Relay, Unit

Withdrawn

From

Case

(Rear

View)

-

MAIN SHAFT

BRACKET

FLEXIBLE

STOP ARM

Right Side

View

,-:----REAR

MOUNTING·

LARGE GEAR

ON

MAIN

SHAFT

DRIVING

SPRING

DRIVING

SPRING

COLLECT

Fig. 3

(800qB23

&

800qB2~)

RPM

Relay

Unit

Subassembly

Between

Front

and

Rear

Mounting

Plates

2

-

•

I

-

•

8

.-~

(

"I

-"--./

7""-'\

I )

,---,

!

-----

!'J

INTRODUCTION

The

RPM

13

and

15

relays

mounted

in

'

an

SI

drawout

case

are

general

purpose

direct

current

operated

auxiliary

timing

relays

having two

cam

operated

closing

contacts.

Each

contact

has

an

independent

adjustable

time

setting

with

the

exception

that

the

contacts

must

always

close

in

the

same, sequenc.e

with

a

minimum

time

of

several

cycles

between

the

closings

of

the

two

contacts.

Sl'!e

the

section

on

CHARAC-

TERISTICS

for'

further

discussion

of

the

minimum

time

between

contact

closings.

Each

contact

has

its

own

target

and

the

relay

has

one

electrically

separate

seal-in

unit

generally

used

with

the

TU-l

contact.

In

addition

the

RPM15

relay

employes

a

telephone

type

relay,

TY,

to

provide

a

con-

tJm!PJ!s

~Qil

n~tJng.

,S.ee

Table

No.

A.

for

different

models.

APPLICATION

These

RPM

relays

can

be

applied

wherever

an

accurate,

direct

current

op-

erated,

timing

d.evice, .

.wJfu_

~_adjustable

timing

ranges

0.1

to

1

second

or

0.15

to

3

seconds

is

required:

-A

typical

application

is

illustrated

in

Fig.

4

where

the

RPM13

relay

is

used

to

provide

a

time

delay

before

the

back-up

fault

relays

b~come

effective.

The

fault

relays

together

with

the

RPM

re-

'lays

are

used

here

to

provide

back-up

protection

for

a

unit

type

generator

installa-

tion

against

P:rolongE!d

multiphase

faults

on

the

adjacent

system.

When

the

fault

relays

operate,

they

start

the

RPM

relay

which

trips

the

main

breaker

after

a

predeter-

mined

time

thru

its

own TU

-1

contact

and

the

fault

relay

contacts.

If

for

some

reason

the

generator

is

still

connected

to

the

fault,

the

fault

relays

will

remain

picked

up

and

when

the

second

RPM

contact

(TU-2)

closes

after

an

additional

predetermined

time

it

will

operate

a

lockout

relay,

Type HEA,

which

shuts

down

the

unit

generator.

Fig.

5 shows

the

RPM15

relay

sub-

stituted

for

the

RPM13

relay

in

a

similar

application.

, Tbe

RP~

re~ay

tripping- cpnt!ict.s

@o:t,Il,c;I:

alwaysOe

used

IIi

senes

WIth

the

lll-

itiating

relay

contacts

in

a

trip

circuit.

In ,this way any

overtravel

which

may

exist

in

:

the

RPM

relay

is.

negated

by

the

opening

of

the-initiating

relay

contacts.

TIMING RELAYS

TYPE'RPM

* TABLE A

TIMING

COILCmCUIT

CONTACT DWELL TIME

RANGE TIME RATING

TU-l

TUc.2

~ODEL---

- -

Seconds Seconds

Cycles

(60 Cycle

Base)

12RPM13All

&

Up

0.15 -

3.0

60

9-15 9-15

12RPMI3B11 &

Up

0.10 -1.0 60 'Maintained 3,.5

12RPM13D11 &

Up

0.15 -

3.0

60 Maintained 9-15.

12RPM15Al '&

Up

0.15 -

3.0

.Continuous

9-15

Maintained

12RPM15Bl1 &

~

0.10 -1.0 Continuous Maintained Maintained

12RPM15CL'&

p

'12RPMl5Dl:

.&'Up

0.15 -3.0 Continuous

Maintained

,0.15 -

3,.0,

, COl;ltinuous

Maintained

'Maintained

RATINGS

These

RPM

relays

are

available

with

i

operating

coils

for'

24

to

250

volts

D.C.,

As

indicated

in

Table

A

the

RPM13

relaysl

have

coils

rated

for

one

minute

and

the

RPM15

relays

have

continuously

rated

coils.:

The

target

and

seal-in

units

are

current,

,

operated

devices

with

ratings

of

either

0.2

,

or

1.0

amperes.

The

timing

contacts

TU-1

and

TU-2

are

for

circuit

closing

only. They

will,

carry

a

maximum

of 30

amperes

for

the

time

it

takes

to

trip

a

breaker

and

have no

interrupting

rating.

Since

these

contacts

have

no,

interrupting

rating,

any

control

circuit

involving

these

contacts

must

be

cleared

bya

circuit

breaker

auxiliary

switch

or

other

suitable

means~

The

contact

interrupting

rating

of

the

telephone type

relays

are

shown

in

Table

B.

'The

contact

rating

of

the

seal-in

unit

is

shown

in

Table

C.

CONTACT INTERRUPTING ABILITY

TABLE

:i3

..

'-

TARGET

AND

SEAL-IN UNIT

TABLE C

,1~()'Amp

'0.2 Amp'

~'Tap

Tap

DC

Resistance

O,2;L'ohms ;jl

..

:ohms

Minimum

Operating

l~O,amps

0

•.

2

amps

Carry

Continuously

;2

..

.if:amps 0.35

amps

Carry

30

amps

for

'2

sees.

---------

Carry

10

amps

for

15

secs.

0.2 flecs.

60-cycle

Impedance

:2.0:

ohms

52

ohms

CHARACTERISTICS

OPERATING

PRINCIPLE

The

RPM

relay

operates

on

the

prinCiple

of

using

the

energy

from

a

charged

spr.ing.

The

spring

is

charged

by a

solenoid

called

a

rotonoid

because

of

its

circular

shaped

plunger.

The

energy

of

the

spring

is

diSSipated

through

a

gear

train

at

a

rate

controlled

by a

damping

magnet.

The

timing

contacts

are

operated

by

cams

attached

to,

this

gear

train.

,

The

TX

coii

of the

RPM

relay

has

a

very

low

drop-out

voltage.

This

low

drop-

out

makes

it

possible

for

an

indicating

lamp

in

series

with the, TX

coil

to

keep

that

el~mentpicked

up

after

it

has

operated.

For

thIS

reason

it

is

important

that

caution

be

~xercised

in

the

application

of

the

relays

to

msure

that

there

are

no

sneak

circuits

which

can

permit

the

TX

coil

to

be

sealed

in

through

a

lamp

or

some

other

device.

Volts

Interruption

Current'

(Amps) MINIMUM OPERATING VOLTAGE

Inductive* Non-Inductive

48-DC

1.0

3.0

125-DC 0.5 1.5

250-DC ' 0.25 0.75

115-60

cy.

0.75 2.0

230-60.cv.

0.5 1.0

* Inductance of

Average

Trip

Coil

The

operation

of

,the rotonoid desig.;

nated

as

"Tun

is

controlled

by

the

contacts

of

the

telephone

type

relay

designated

as

"TX". .

Both

this

telephonetype

reia

y

"TX",

and

the

telephone

type

relay

"TY"

which

is

used

in

the

RPM15

relays

will

operate

at

80%

of

rated

voltage

or

above.

These instructions do not purport to cover all details

or

variations

in

equipment nor to provide for every poaib/e

contingency to

be

met

in

connection with installation, operation

or

maintenance. Should further information

be

desired

or should particular problems arise which

are

not covered sufficiently for the purchaser's purpases, the matter should

be

referred to the General

Electric

Company.

3

GEH-2031

Timing

Relays

Type

RPM

4

.........

------~--------

(+)

1

94

7

"-'T

62

TU

INDICATmG

lAMP

IF

reED

1-00

SHUI'

DOWN

r---

}

S6

CONTACTS

C

UNrr

-+-------;6--

____

~

(-)

LEGEND

DEVICE

FUNCTION

NO.

TYPE

21

CEB12C

BACK

UP

DT.~.HT~1i'

'R'W,T.A

V

94

HGAJ.4AM

or

.At

AUXILIARY

TRIPPTI7G

RELAY

86 HE!

LOCKOUT

REIAY

62

RPM13A,13B

or

13D

TlMmGRELAY

Fig.

~

(IO~A8985-1)

Typical

Applicaiionof

the

RPM!3

Relay

As

A Timer In A

Unit

Generator

Back

Up

Scheme

.1"\.\

)

/

,'1

J~

<..J

r,

i~~

___

)

.-

......

_.

--

..

--

..

~-.-

-==================

TimiJ\g Relays Type RPM GEB-2031

WHEN

USED

2

1

SI

TX

PROTECTIVE

lY

RELAY

1

lY

lSI

TY

T2

SI

10

4

TO

5

TRIP TRIP

CIRCUIT

Fig. 5

(~18A836-1)

Typical

Appl

icatioli

of

the

RPMI5

ReJ'ay

r---~------

__

---,

I

I.

I

7 I 9 I,

. I I

~/~/

TEST

PLUG

1l.I2

WHEN

USED

lY

TO

8

TO

TIME

TU-l

TO

10

TO

T.IME

TU-2

TIMER

A.C..

SUPP

Y

TIMER

VOLTAGE

SEAL-IN.

RATING

AMPS.

24

1.0

o 2

4 1 0

48

0.2

1

0.2

D..

c..

CONTROL

SUPPLY

R

OHMS

0

24

120

0

120

600

CAUTION:-

DO

NOT

KEEP

Sl

CLOSED

LONGER

THAN

NECESSARY

TO

OBTAIN

TIME

TEST,

BECAUSE

OF

THE

SHORT

TIME

RATING

OF

THE

ROTONOID.

lY

Fig.

6 (377AI21-1)

Test

Circuit

For Checking

Time

Calibration

of

the

RPM

Relays Covered

By

This

Book.

_______

.

____

.

___

.____

~_

..

_____

.

__

Testl!!!L.!!rminlll

Numbers

Corrllspond iQ.!/1e

ReI!!)'

$J~!l

Numbe.r.s_

5

GEH-2()3~

Timing

Relays

Type

RPM

'rhe

rmmmum

pickup

of

the

rotonoid

i:>

'('leU below

the

pi(~kup

level

of

the

"'IX"

relay

or

about

50%

of

rated

voltage.

THE

TIMING OPERATION

The

maximum

operating

times

of tIlese

RPM

:relays

are

either

"one"

or

"three"

seconds

depending upon tile

nlOdeI.

The

minimum

operating

time

is

in

the

order

of

0.1

seconds.

The

desired

operating

time

is

con~

trolled

by

cams

which

can

be

set

at

any

position

on

the

Ume

dial.

These

cams

as

they

rotate

>.will

close

the

front

and

back

contacts

called

TU-1

and

TU-2

respectively.

The

cams

in

passing

will

hold

the

contacts

closed

for

a

specific

time

called

"DWELL

TIME".

Some of tile

models

have

tile

front

contact

maintaining,

cam

shaped

to

hold

the

contact

closed

through

the

balance

of the

time

range.

The

back

contact

on

the

con-

tinuously

rated relay

is

in

effect

maintainild

by a

contact

of

the

"TY"

r.elay which

seals

around'1;'U-2.

NOTE:

The

"dwell"

time

will

vary

depend-

ing

upOn

the

time

range

and

position

of

the

cam.

See

Table

No. A

for

details.

The

cams

cannot

be

set

togetller

to

operate

their

contacts

at

tile

same

time.

The

time

difference

between

the

closing

of

the

front

contact

and

the

back

contact

with

the

cams

set

as

close

together

as

the

mechanism

will

permit

will

vary

depending

on

the

time

range

and

the

position

of

the

cams

on

the

dial.

Fer

the

one

second

rel;j.y

this

time

difference

range

will

be

between

0.030

and

0.06

seconds.

The

range

for

the

three

second

relay

i~

.08

to

0.12

seconds.

Under

nor!llill

operating

voltage,

the

operr4tingtb:pe

at

the

maximum

dial

setting

will

be

accura.te within

±.

5%.

As

the

dial

scal.e

settings

are

decreased,

the

variation

will

apprqach

a

maximum

of

::,

10%

of.

the

scale

reading.

The

consistency

of

the

op-

erating

time

on

any

specific

setting

will

be

within

±.

2%.

The

resistance

of

the

various

relay

:

components

is

shown

in

Table

D.

CONSTRUCTION

The

general

construction

of

these

re-

lays

is

shown

in

Figs.

1

and

2.

The

basic

elements

are

the

driving

magnet"the

gear

train,

the

damping

magnet

and

the

time

dial

assembly.

The

auxiliary

elements

such

as

the

telephone

type

relay,

targets

and

seal-in

unit

round

out

the

con-

struction.

The

driving

mag;net,

or

rotonoid

charges

two

spiral

springs

as

it

rotates

approximately

180

degrees.

One of

the

springs

located

on

the

rotOnoid.

serves

to

l'eset

tbe

as.sembly.

The

other

in

the

gear

train

drives

the

gearing

and

the

associated

damping

system.

The

gail!;'

train

~s

anacCl!r~t~!y~~I.'1~~

bled

clock

type

mechilnism

mounted

be-

v,veen two

parallel

plates

in

such

a

manner

as

to provi(ie

proper

shaft

.end

play

and

gear

mesh

(see

Fig.

3)

..

The

charged

spring

drives

this

mechanism

at

a

speed

which

is

controlled

by

the

damping

system.

A

ratchet-pawl

assembly

permits

quick

reset:

The

damping

system

consists. of a

copper

cup

mounted

on a

shaft

rotating

in

.

an

annular

gap

across

which

exists

a

permanent

magnE)t

field.

While

the

position

of

the

cup in

the

magnetic

field

will

provide

some

control

of

the

time,

the

main

control

varies

with

thEl.

degree

to whiCh

the

spring

is

charged.

On

the

one

second

relays

the

length

of

the

copper

cup

has

been

repuced

to

provide

less

drag

which.

helps

to

obtain

the

faster

operating

time.

The

time

d'lal

assembly

is

mounted

on

the

out-put

shaft

of

the

gear

train.

The

un~t

consists

of

adjustable

insulated

cams

which Operate

the

TU~l

and

TU-2

contacts.

There

are

pointers

on

the

cams

which

can

be

lined-up

on

the

time

dial

scale.

The

time

dial

scale

on

the

three

second

relays

is

calibrated

in

tenths

of a

second.

The

one

second

relay

is

calibrated

in

cycles

(60

cycle

bases)

with

graduations

of 2.5

cycles

•.

TABLE P

VOLTAGE T RESISTANCE IN OaMS

RATING I TU R1 TX

RS

TY R4

250 I 100 300 5000 5000 7500 7500

220 I 100 250 5000 5000 7500 7500

125 100 100 5000 7500

110 100

75

5000 7500 7500

48

I

7 }'3.5 200 200 425 425

32 7 6 200 70

24 7 3 200 425

CURRENT I RESISTANCE

IN

OHMS

RATING ! TARGET SEAL-IN UNIT

0.2A I 7.5 6.0

1.0A 0.35 0.25

6

The

relays

may

have

either

a

pointed

shaped

cam

in

the

front

position

which

in

passing

closes

the

TU-1contact

momen-

tarily

or

a

contact

maintaining

cam

which

when

engaging

the

TU-1

contact

holds

it.

closed

throughout

the

timing

range.

The

"TX"

and

"TY"

components

are

telephone

type

relays.

The

seal-in

unit

is

a

small

hinged

armature

type

relay

consisting

of a

"U"

shaped

magnet

frame,

fixed

pole

piece,

armature,

and

a

tapped

coil.

The

arma-

ture

carries

a

"T"

shaped

moving

contact

which

bridges

the

two

stationary

contacts.

The

targets

are

hinged

armature

as-

semblies

with

armatures

painted

orange.

When

operated

they

release

a

shield

which

drops

and

exposes

the

orange

colored

sur-

face

of

the

armature.

RELAY CASE

Components

of

each

relay

are

mounted

on a

cradle

assembly

which

can

be

easily

removed

from

the

relay

case.

The

cradle

,is

locked

in

the

case

by

means

of

latches

at

the

top

and

bottom.

The

electrical

con-

nections

between

the

case-block

and

cradle

block

are

completed

through

a

removable

cDnnection

plug.

A

separate

testing

plug

can

be

inserted

in

place

of

the

connection

plug

to

permit

testing

the

relay

in

its

case.

The

cover

is

attached

to

the

front

of

the

case

and

includes

the

target

reset

mecha.-

nism

and

an

interlock

arm

to

prevent

the

cover

from

being

replaced

until

the

con':'

nection

plug

has

been

inserted.

The

case

is

suitable

for

either

semi-

flush

or

surface

mounting.on

panels

up

to

two

inches

thick.

Hardware

is

available

for

all

panel

thickness

up

to

two

inches,

but

panel

thickness

must

be

specified

oil

the

order

to

insure

that

the

proper

hardwar.e

will

be

provided.

Outline

and

panel

drilling

dimensions

are

shown

in

Fig.

14.

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

dam-

age

claim

at

once

with

the

transportation

company

and

promptly

notify

the

nearest

General

Electric

Apparatus

Sales

Office.

Reasonable

care

should

be

exercised

in

unpacking

the

relay.

If

the

relays

are

not

to

be

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.

ACCEPTANCE

TESTS

Immediately

upon

receipt

O.f

the

relay

an

inspection

and

acceptance

test

should

be

made

to

insure

that

no

damage

has

been

sustained

in

shipment

and

that

the

relay

calibration

has

not

been

disturbed.

VISUAL INSPECTION

Check the

nameplate

stamping

to

insure

that

the

model

number,

rating

and

calibra-

. tion

range

of the

relay

received

agree

with

the

requisition.

Remove

the

relay

from

its

case

and

check

by

visual

inspection

that

there

are

no

broken

or

cracked

molded

parts

or

other

signs

of'

physical

damage

that

may

have

occurred

in

transit

and

that

all

screws

are

tight.

MECHANICAL INSPECTION

The

essentials

of a

mechanical

inspec-

tion

are

to

determine

that

all

of

the

operating

elements

are

free

from

any tendency to

bind

and

are

in

correct

adjustment

as

specified

below:

.L The rotonoid

-'

The

shaft

end

play

in

this

assembly

is

limited

to

insure

proper

clear-

ances

between

the

armature

and

the

spool

body. The

armature

should

rotate

without

any

tendency to bind.

2.

The

gear

train

-Check

for

end

play

in

all

the

shafts.

Rotate

the

assembly

bythe

roto-

noid

and

note

that

it

moves

with a

steady

motion to the

limit.

of

its

travel.

Permit

the

assembly

to

reset

reasonably

fast

to

check

the

action

of the

ratchet.

See

that

the

pawl

engages

the

gear

teeth

with

positive

action. Check

all

the

set

screws

to

see

that

they

are

tight.

3. The

time

dial

-Check the

action

of

the

cams

as

they engage the

timing

contacts.

They should engage

at

the

"V"

section

on~y,

causing

the

contact

to

deflect

and

close

WIth

about 1/64:" wipe. The

contact

gap

at

the

TU-1

and

TU-2

contact

should

be about

1/16".

" .

4:.

Telephone Type relays. -With

t~l.ephone

relays

in

the

de-energIzed

posibon

all

circuit

closing

contacts

should have a gap

of 0.015" and

all

circuit

opening

contacts

have a wipe of 0.005". Gap

maybe

checked

by

inserting

a

feeler

gage

and

wipe

can

be

checked by

observing

the amount of

de-

flection

on the

stationary

contact

before

parting

the

contacts.

The

armature

should

then

be'

operated

by hand

and

the gap

and

wipe

again

checked

as

described

above.

5.

Seal-In

unit

-

The

seal-in

unit

should

be

checked

as

follows: The

armature

and

seal-

in

contacts

should move

freely

when op-

erated

by hand.

There

should be a

screw

in

only one of the tap

positions

on the

right

stationary

contact

strip.

Operate

the

arma-

ture

by hand and check

that

there

is

at

least

1/32"

wipe on

the

seal-in

contacts.

6.

The

targets

-

Operate

the

armature

and

note

that

when

the

shield

drops

the

armature

will

continue to

travel.

This

indicates.

that

the

shield

will

have adequate

clearance

when

it

falls.

ELECTRICAL TESTS

The

following

electrical

tests

are

recommended

upon

receipt

of

the

relay.

1. Make

time,tests.

2. Check

minimum

operating

value of

telephone

relay.

3. Check

target

and

seal-in

unit

pickup .

values.

Check the

time

calibration

using

the

connections shown in

Fig.

6. Check the

operating

time

:;tt

the

maximu~

time

range

setting

and agaro

at

some

porot about

1/2

of the

time

range.

The

relay

timing

ac-

curacy

should be within the

test

limits

indicated

in the

section

under

CHARAC-

TERISTICS. The

test

circuit

is

arranged

to include the

seal-in

unit

time

which

was

not included in

the

factory

time

setting.

Howe:ver~

since

this

seal-in

wiit

time

is

about 0.01

seconds,

it

will have

little

effect

on the

final

results.

Using connections shown in Fig. 7 the

telephone type

relays

should

pick

up

at

80%

or

less

of

rated

voltage. When

testing

the

RPM15

relays

the

normally

closed

contacts

of the TY

relay

should blocked open

and

the

TU-2

(rear)

contact

should be

closed

manu-

ally.

This

is

to

prevent

the

operation

of

solenoid TU

so

that

the

regulation

of the

test

circuit

will

be adequate to

permit

reliable

test

results.

Using connections shown in Fig. 7

check

the

targets

and

the

seal-in

unit

pickup. to

confirm

that

they

:will

operate.

on

rated

current

or

less.

While

making,

these

.. test!:; the Qperating

cams

caIJ. be

manually held in the

proper

position

to

keep the

desired

contact

closed.

When

seal-in

unit

(SI)

is

picked

up the opening of

switch

"S" should not

de-energize

this

unit.

Connections

can

be

made

to the

relay

studs

but

for

panel-mounted

relays

a

test

plug

can

be

used

to faCilitate the

operation.

Since

the

rotonoid

has

only a one minute,

rating,

the

operator

must

be

sure

that

this

solenoid

is

not

damaged

by overheating.

If

as

a

result

of

these

tests

any

adjustments

are

necessary,

refer

to the

section

on

SERVICING

for

information.

INSTALLATION

PROCEDURE

If

after

the ACCEPTANCE TESTS the

relay

is

held in

storage

before

shipment

to

the

job

site,

it

is

recommended

that

the

visual

and

mechanical

inspection

described

under

the

section

on ACCEPTANCE TESTS

be

repeated

before

installation.

It

is

also

advisable

to

check

the

specific

time

settings

that

are

to be

used.

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

In view of

the

vital

roll

of

protective

relays

in the

operation

of a

power

system

it

is

important

that

a

periodic

test

program

be followed.

It

is

recognized

that

the

interval

between periodiC

checks

will

vary

depending

upon environment, type of

relay

and the

user's

experience

with

periodic

testing.

.Until

the

user

has

accumulated

enough

experience

to

select

the

test

interval

best

suited

to

his

individual

requirements,

it

is

suggested

that

the

followingpointsbe

check-

ed

at

an

interval

of

from

one to two

years.

ELECTRICAL TEST

Using connections shown

in

Fig.

6

check

the

operating

time

of the TU-1 and TU-2

contaCts

at

rated

voltage

and

present

time

Timing

Relays

Type RPM GEH-2031

setting

to

be

sure

they

are

within the

limits

specified

under

ACCEPTANCE TEST and,

that

the

targets

operate

properly.

If

for

any

reason

the

operating

times

are

outside

these

limits,

refer

to

the

SERVICING section.

SERVICING

CONTACT CLEANING

For

cleaning fine

silver

contacts,

a

. flexible burnishing tool should be

used.

This

consists

of a flexible

strip

of

metal

with

an

etched

roughened'surface,

resem-

bling

in

effect

a

superfine

file.

Thepolish-

ing

action

is

so

delicate

that

no

scratches

are

left,

yet

corroded

material

will be

removed

rapidly

and thoroughly. The

flexibility

of the tool

insures

the

cleaning

•of the

actual

points

of contact.

Fine

silver

contacts

should not

be

-cleaned with knives,

files

or

abrasive

paper

or

cloth. Knives

or

files

may

leave

.

scratches

which

increase

arcing

and

de-

terioration

of the

contacts.

Abrasivepaper

or

cloth

may.

leave

minute

particles

of

in-

sulating

abrasive

material

in the coritacts,

thus

prevent

closing. ,

A

burnishing

tool

as

described

above

can be obtained

from

the

factory.

MECHANICAL ADJUSTMENTS

The

specific

adjustments

and

setting

on

this

relay

should

rarely

require

atten-

tion.

If

for

one

reason

or

another

they

have

been

disturbed

the

following

points

should be

observed

in

restoring

them:

1. The gap between the

contact

tips

on

each

set

of

the

timing

unit

contacts

should

be apprOximately

1/16

inch.

Each

contact

brush

should

bear

against

its

respective

scraper

brush.

.2. When

rotated,

the

insulated

cams

should

touch the

inner

contact

brush

at

the "V"

only,

but

high enough on

the

"V"

to

insure

1/64: inch wipe on the 'outer

contact

brush.

These

cams

should not extend beyond the

edge of

their

respective

contact

brush.

3. With the

pointer

'of the

rear

insulated

cam

set

at

the

maximum

time

setting

on

the

scale,

this

cam

should

rotate,

far

enough beyond the apex of the

"V"

in the

contact

brush

to allow

the

contacts

to

re-

,open when the

timing

unit

is

fuily

operated.

4.

There

should be

at

least

1/32

inch

clearance

between the

time

scale

assembly

and the

front

mounting

plate~

5.

There

should be no binding between

the

gear

on the main

shaft

and

the

pinion

on

the

magnetic damping

element

shaft.

6. The pawl of the

ratchet

assembly

on

the magnetic damping

element

shaft

should

'remain

engaged to the

same

tooth when

the

time

scale

is

rotated

from

zero

to 'the

maximum

time

setting

mark

and

should

allow

the

gear

to

slip

when the

scale

is

released.

7. The flexible

stop

arm

at

the

rear

of

the

main

shaft

should

clear

the supporting

bracket

by

at

le::tst

1/32

inch. .

7

GEH-2031 Timing

Relays

Type RPM

8

tc

SLnty

RAlBI

VDlTACE

•

Tl

13

,

15

RElAYS

----I----r

, . ®

r·

L •

rl

TlU•

,.-,

TlU-l

__

RPM

13

,

15

RPM

13

RPM

15

-SEa.

IN--....-

4

TARGET

...

TIIICiET

atIJ

SEa.

IN

lJIIT

TEST

aHECTlatS

F~

RPM

13

&

15

5

Tl

AC

SUPPLY

TIMER

CLUiCH

COIL

At.

INlJII T

1lJRREHT)

/~

\

'I

(J

8. With

the

operating

magnet

in

either

the

de-energized

or

the fully

operated

posi-

tion, the driving,

arm

should

clear

the

cutout

section

of the

main

shaft

supporting

bracket

by

at

least

1/32

inch.

9. The

driving

arm

assembly

should

clear

the

rear

mounting

plate

by

at

least

1/32

inch.

10.

There

should

be

at

least

1/64

inch

clearance

between

the

reset

spring

collet

and

the

rear

bearing

of the rotonoid.

11. The

time

of

operation

for

any

scale

setting

may

be

varied

by

sliding

the

copper

cup

forward

or

backward

on

its

shaft

or

turning

the

driving

spring

collet

on

its

shaft.

Be

Sure

to

tighten the

set

screw

,

after

adjustments

have

been

made.

12. With

the

rotonoid

de-energized,

the

reset

spring

is

prewound

approximately

one-half

revolution-and

the

driving

spring

is

prewound

approximately

three-fourths

of

a

turn.

13.

The

gap of

all

TX and TY

unit

con-

tacts

should be 0.015".

14. The wipe of

all

TX

and

TY

unit

con-

tacts

should be

approximately

0.005 inch.

15. The end of

the

residual

screw

of

the

TX

unit

should

project

at

least

0.002"

beyond the

inside

surface

of

the

armature.

16.

The

seal-in

unit

should have

at

least

1/32"

wipe on

its

contacts,

measured

at

the

end of

the

armature

adjacent

to the

contacts.

If

wipe

is

too

small,

it

can

be

increased

by

lowering

the

position of

the

stationary

contact

members.

In

the

final

adjustment

the

contacts

should

make

ap-

prdximatelyaftlie-same

liistant

whe

-the

armature

is

operated

by hand.

TIME

CALm~ATION

Adjust

the

front

cam

so

that

it

ap-

proaches

the

zero

mark

on the

time

cilal

scale.

The TU-1

contact

should

just

make

when the pOinter

reaches

zero.

Set the

time

dial

at

its

maximum

setting

and with

the

test

cii'cuit

shown iil

Fig. 6

check

the

time

at

rated

voltage.

The

limits

should

be

within

:±:.

5%

of

the

dial

reading.

'If

the

time

is

outside

these

limits

Timing

Relays

Type RPM GEH-2031

it

can

be

corrected

by

sliding

the C JPper

cup

forward

or

backward

on the

magnetic

damping

element

shaft

or

by

turning

the

driving

spring

collet

on

its

shaft.

Moving

the

copper

cup

forward

de-

creases,

the

time

delay and moving

it

backward

increases

the

time

delay.

Never

move

the

copper cup backward enough to

strike

the

rear

plate

of damping

magnet

element.

Turning the

driving

spring

collet

in a

counter

clockwise

direction

(front view)

decrease

the

time

delay and in a clockwise

direction

increase

the

time

delay.

RENEWAL

PARTS

It

is

recomm

ended

that

sufficient

quan-

tities

of

renewal

parts

be

carried

in

stock

to enable

the

prompt

replacement

of

any

that

are

worn,

broken

or

damaged.

When

ordering

renewal

parts,

address

the

n'earest

Sales

Office of the

General

Electric

Company, specifying the quantity

required

and

describing

the

parts

by

cata-

logue

numbers

as

shown in Renewal

Parts

Bulletin

No. GEF-3835.

9

I

·1

1

j

I

1

I

====,,--,-~~~-~~-~

,-----_

..

-

GBB-2OS1

Timing Relays Type RPM

VOLTS

RES

I

STANCE

TX

TU

RI

VOLTS

RESISTANCE

,

125

!l000

100

10,0

TX

R3

TU

RI

"110

500"0

100

75

.,

211' '

-200

7 3

250

5000

100

300

118

200

7

13.5

220

COOO

5000

100

250

32

200

7IJ 7 II

S

..

I 1

R3N

L1

S.L.

'

IX'

- - 1

5,.

L.

Tl

i"

I--

TX

TU

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s. L.

I I I

-I

II,

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,'I'

'I,'

"I,',

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,,

2

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'"

Ii

'

,8_

'10'

l III

~

I{III

2 4

".'

8

10

Fig.

8

(6375892~2)

Internal

Connections

(Front

Ylew) For

~

RFMI3A,

Band

D Relays Rated

2~,

110

or

125

YDC

FIg.

II

(1375893-5)

Internal

Connections

(Front

View) For

The

IPMI3A,

'~d

D Relays Rated 32,

~8,

220or,250,YDC

i

vom

,

RES

I

STAliCE

~

,

...

'IX

R3

TU

Rl

TY

'R4

,VOlTS

REStSTMCE

TX

'TU

'Rl

" 'lY

148

200

200 7 13.5 425 '425 ,24

200

'7

3 425

r

250

5000

100 300 7500 ,

7500

125 5000 100 100 '7500

I 220 5000 5000 100 250 7500 7500 110 5000 100 75 7500

r-

J-~

OR3

tTY

:-

51

,¥TY

,Wl

;:;.51

I

it--

t---

,

'Tl

T2

t-:--

ITX

[}.

TX

';>

~

TU

TY

TV

.---

tTY

IIT~

1_n

-

'51

;

¥-TY

,<

SI

RiO

:

t--

I--'-

TY~

-T1

T2

I--

::-

TX

I

rx

',T"('

TX

?TU

0--

'I

I

3

\

"I

\

\,

~

I I

3

2

Fig.

10

(~3AI8~-2)

Internal

Connections

(Front

View) For The

RPMISA

Relays Rated

~,

220

or

250

VDC

Fig.

II

(IJOSAI83-3)

Internal

Connections

(Front

View) For The

RPMI5A

and C Relays Rated

2~,

110

or

125

'DC

10

r',

'\.

-')'

c)

VOLTS

Rl

TV.

24

j

..

125 100

7!!1!1l

110

7J

7.

SI

51

•

r~.

J

~

I

';g.

12

(!27A9402-1)

W,rn"

COMOOtlS

(F'oot

Vi,w)

Fo,

Th.

!!I'

I

51

6

I

RPM15B

Relays

Rated

24, 110

or

125 VDC

51

r

~

-r

~

5 r

2

l!

6

TI

T2

~

7

1Y

.tlQIE;POLARITY

ON

TX

COILS MUST

BE

THE

SAME,

OTHERWISE

THEY WILL

,.!!l.!QL

*

Fig.

14A (0208A5573-0) Sh.1

Internal

Connections

(Front

View)

For

The

RPM

15DRtHay

_

'<-"ff

*

Denotes

change

smce

supersededllssue.

Timing

Relays

Type

RPM

GEH-2031

RESISTANCE

VOLTS

TX

R3

I

TU

1

Rl·

jW

I

R4

41!

200

200]

7

Il~.5

i42!l I 425

250

5000

,100 I

;:100

1

7500

17500

1220

5000

j 100 I

~"c

7500:

,

7500

'-

51

...

--

t----

-Fig.

13

(127A9401-0)

Internal

Connections

(Front

View) Fo!"

The

RPM15B

Relays

Rated

48,220

or

250

'roc

RESISTANCE

VOLTS

TX

TU

!

Pi

I

TY

48 I I

i

125

5K

15K

100

I7,5K

I I

250

1 L

...

~

........

*Fig.

14B (020SA5573-0) Sh.2)

Internal

Connections

(Front

View)

For

The

RPM

15D

Relay

11

GEH-2031

Timing

Relays

Type

RPM.

-

m·

606b6

00000

·2

4 6 8

10

Ii)

NUMBE~NG

OF

STUDS

(fRONT

VIEW)

.

PANEL

.DRILLING

FOR

SEMI-FLUSH

.

MOUNTING

(FRONT

VIEW)

PANEL

LOCATION

SEMI-FLUSH

SURFACE

~TG.

..

.

MTG.

"IH11~'

r-

-1

m

V

.:..

.--

1110-32-

~

MTG.

~

8

SCREW

vLl

OUTLINE

r

:I

PANEL

V

U

VIEW

.SHOWINGASSEMBLY

OF

HARDWARE

FOR

SURFACE

Nrc;.

ON

STEEL

PANELS

.

Fig.

I~

(6209271-3) Outline

And

Panel

Drilling

DI.enalons For

The

RPM

Relays Covered

By

This

IIoGk

3-7l

GENERAL

ElECTIIC

COMPANY,

PHILADELPHIA,

PA.

•

GE RPM 13A User manual

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