Ge Vt-700 User manual

PRELIMINARY

GEK·228IS

VT-700

@

GENERAL

PURPOSE

DUPLEX

DRIVE

SYSTEM

(DRIVE

CODE

AC·3061)

INSTRUCTION

MANUAL

FOR:

INSTALLATION

OPERATION

TROUBLE

SHOOTING

GENERAL.

ELECTRIC

SECTION

I

II

III

IV

1.1

1.2

1.3

2.1

2.2

2.2.1

2.2.2

2.2.3

2.2.4

2.2.5

2.3

2.3.1

2.3.2

2.3.3

3.1

3.2

3.3

3.4

3.4.1

3.4.2

3.4.3

3.5

3.5.1

3.5.2

4.1

4.2

TABLE

OF

CONTENTS

INDEX

GENERAL

Scope

of

Manual . • • • • • . • • • • .

Safety,

Personnel

and

Equipment.

Warranty

and

Shipping

• • • • . •

SYSTEMS

EQUIPMENT

DESCRIPTION

Equipment

Prupose

• • • • • •

Equipment

Furnished

-

General

•

Power

and

Control

Unit

. • • •

AC

Drive

Motor • • • • . .

Sensor

. . . . . . « • • • • • •

Special

Purpose

Equipment •

Receiving,

Handling

and

Storage

• .

Equipment

Functional

Descripticn

Function

of

Controls

and

Indicators

• •

Location

of

Controls,

Indicators

and

Assemblies

• •

••

••••••

Theory

of

Operation

• • . • • • • • • • •

INSTALLATION

General

. . · · · · ·

Equipment

Location

· · · ·

Tools

Required

· . . .

Mechanical

Installation

Power

Unit

Pressure

Sensor

· . · · · ·

Motor . · · ·· · . · · ·

Electrical

Wiring

and

Interconnection

· ·

Motor

Connections

. . . I · · · ·

Driver

Power

Unit

Connections

· . · · · ·

STARTUP

AND

CHECKOUT

General

· · · · · . · .

Startup

and

Checkout

i

PAGE

1-1

1-3

2-1

2-2

3-1

3-2

3-5

3-6

4-1

SECTION

v

VI

VII

VIII

IX

5.1

5.2

6.1

6.1.1

6.1.2

7.1

7.2

6.1.3

8.1

8.1.1

8.1.2

9.1

9.1.1

9.1.2

9.1.3

9.1.4

9.1.5

9.1.6

9.2

TABLE

OF

CONTENTS

(Continued)

INDEX

MAINTENANCE

Mechanical

Motor

Lubrication

TROUBLESHOOTING

General" • •

••

••••••••

• •

Troubleshooting

-

Startup

• • • •

Troubleshooting

-

Regulator/Power

Conversion

Module

Checking SCR's

••••••••••

SPARE

PARTS

RECOMMENDATION

General

. • • • • • • • • •

. .

~.

.

Recommended

Spare

AssembJies t

Subassemblies

and

Printed

Circuit

Card/Boards

• • • •

DOCUMENTATION/DRAWINGS

FURNISHED

General

• • • • • • •

Documentation • •

Drawings/Prints

•

APPENDIX

Detailed

Theory

of

Operation

• • • • • • •

AC

Power and

Protective

Circuits

Command

and

Logic

Circuits

• • • . • . • •

Regulator

• • • • • • . • • • • • • •

Transfer

Function

(TRFUNC)

• • • •

Power

Conversion

Module • • •

AC

Motor • . . • • • . • • • • • • •

Nomenclature Symbols and

Abbreviations

ii

PAGE

5-1

6-1

6-2

7-1

8-1

9-1

9-2

9-3

9-4

9-6

FIGUBE

2-1

2-2

2-3

2-4

3-1

9-1

•

TABLE

2-1

6-1

6-2

LIST

OF

ILLUSTRATIONS

INDEX

PAGE

Location

of

Controls

and

Indicators

-

Control Unit (C.U.)

Door

• • • • 2-6

Location

of

Regulator

Adjustments • 2-7

Location

of

Assemblies and

Controls

Inside

C.

U•

••••••••••••

2-8

Simplified

Block Diagram -

VT-700B

2-9

Sensor

Installation

• • 3-4

Functional

Flow Diagram

9-5

LIST

OF

TABLES

INDEX

PAGE

Function

of

Controls

and

Indicators

• • • 2-4

Troubleshooting Tables

Startup

• • • • • • • • • • • • • • • • • 6-4

Regulator/Power Conversion Module • • • • 6-7

iii

1.1

SCOPE

OF

MANUAL

SECTION

I

GENERAL

This

instruction

manual

is

structured

around

a

basic

system.

It

is

a

guide

for

the

installation,

checkout

and

operation

of

the

equip-

ment

furnished

with

general

troubleshooting

procedures

for

the

basic

system.

Any

special

purpose

equipment,

as

requested

on

the

requisi-

tion,

will

normally

be

covered

in

the

schematic

drawings

included

with

this

package.

These

instructions

do

not

purport

to

cover

all

details

or

variations

in

the

equipment

nor

to

provide

for

every

possible

contingency

to

be met

in

connection

with

the

installation,

operation

or

maintenance.

Should

further

information

be

desired

or

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser's

purpose,

the

matter

should

be

referred

to

the

General

Electric

Company.

1.2

SAFETY,

PERSONNEL,

AND

EQUIPMENT

The

following

paragraphs

list

some

general

safety

reminders

and

safety

recommendations

to

be

followed

when

operating

or

installing

this

equip-

ment.

Only

authorized

electrical

and

electronics

personnel

should

install

and

maintain

this

equipment.

Definition

of

terms

and

sign

colors:

WARNING:

CAUTION:

------

NOTE:

Denotes

operating

procedures

and

practices

that

may

result

in

personal

injury

or

loss

of

life

if

not

correctly

followed.

Color:

Black

or

White

lettering

on

red

field.

Denotes

operating

procedures

and

practices

that,

if

not

strictly

observed,

will

result

in

damage

to.

or

destruction

of.

the

equipment.

Color:

Black

lettering

on amber

field.

Denotes

an

operating

procedure

or

condition

that

should

be

highlighted.

Color:

Black

lettering

on

white

field.

1-1

WARNING:

HIGH

VOLTAGE

ELECTRIC

SHOCK

CAN

CAUSE

PERSONAL

INJURY

OR

LOSS

OF

LIFE.

WHETHER

A-C

VOLTAGE

IS

GROUNDED

OR

NOT,

HIGH

VOLTAGES

TO

GROUND

WILL

BE

PRESENT

AT

MANY

PLACES

WITHIN

THE

SCR

DRIVE.

EXTREME

CARE

MUST

BE

EXERCISED

IN

THE

SELECTION

AND

USE

OF

TEST

INSTRUMENTS.

1.

OPERATOR

SHOULD

NOT

STAND

ON

GROUNDED

SURFACES

OR

BE

IN

CONTACT

WITH

GROUND

WREN

APPLYING

TEST

INSTRUMENTS

TO

TEST

POINTS.

2.

CONVENTIONAL

TEST

INSTRUMENTS

SHOULD

NOT

HAVE

CHASSIS

GROUNDED

WHILE

TESTS

ARE

BEING

MADE.

THUS

THE

CHASSIS

CAN

BE

AT

HIGH

VOLTAGE

WITH

RESPECT

TO

GROUND

DURING

TESTING.

EXTREME

CARE

SHOULD

BE

TAKEN

WHILE

ATTEMPTING

TO

ADJUST,

TROUBLESHOOT,

OR

MAINTAIN

ANY

DRIVE

SYSTEM

DESCRIBED

HEREIN.

When

working

on

or

near

the

equipment

with

power/voltage

applied,

i~

ts

recommended

that

all

metal

objects

such

as

rings,

watches,

and

tie

clasps

be

removed.

It

is

highly

recommended

that

all

personnel

working

on

this

equip~

ment wear

rubber

soled

shoes

(insulated).

WARNING

WHEN

WORKING

AROUND

ROTATING

EQUIPMENT,

DO

NOT

WEAR

ANY

LOOSE

CLOTHING

THAT

COULD

BECOME

CAUGHT

IN

THE

EQUIPMENT.

CAUTION

DO

NOT

INSERT

OR

REMOVE

PRINTED

CIRCUIT

CARDS

FROM

THE

EQUIPMENT

WHILE

POWER

IS

APPLIED

OR

OPERATING;

THIS

CAN

DAMAGE

THE

EQUIPMENT.

NOTE

ALWAYS

READ

THE

COMPLETE

SUBSECTION

(EXAMPLE,

3.2)

PRIOR

TO

ANY

TURN-ON

OR

TROUBLESHOOTING

OF

THE

EQUIPMENT.

FOLLOW

THE

PROCEDURE

STEP

BY

STEP.

READ

AND

HEED

ALL

WARNING,

CAUTION

AND

NOTE

SIGNS

POSTED

ON

THE

EQUIPMENT.

1-2

1.3

WARRANTY

AND

SHIPPING

1.3.1

W~rranty

Statement

The

Company

warrants

to

the

Purchaser

that

the

equipment

to

be

delivered

hereunder

will

be

free

from

defects

in

material

or

workmanship and

will

be

of

the

kind

and

quality

designated

or

specified

in

the

contract.

This

warranty

shall

apply

only

to

defects

appearing

within

one

year

from

the

date

of

shipment

by

the

Company.

1.3.2

Receipt

of

Shipment

All

equipment

is

factory

inspected

before

shipment

and

is

shipped

in

good

condition.

Any

damages

or

shortages

evident

when

the

equipment

is

received

must

be

immediately

reported

to

the

commercial

carrier

who

transported

the

equipment.

If

required

t

assistance

may

be

received

from

the

General

Electric

Company) Speed

Variator

Department,

but

when

seeking

aSSistance,

please

use

the

purchase

order

number,

requisition

number, and

model number

to

help

us

in

assisting

you.

1-3

•

2.1

•

2.2

•

SECTrON

rr

SYSTEMS

EQUIPMENT

DESCRIPTION

EQUIPMENT

PURPOSE

The VT-700 Duplex

AC

Variable

Torque

Drive

is

a

pre-engineered

system

designed

for

variable

torque

load

application,

such

as

constant

pressure

puming, where

the

torque

varies

as

the

square

of

the

speed

and

the

horse-

power

as

the

cube

of

the

speed.

Adjustment

of

motor

speed

by

primary

voltage

control

by

using

silicon

controlled

rectifiers,

allows

the

driven

pump

to

control

system

para-

meters,

such

as

pressure,

liquid

level

or

flow

according

to

the

sensing

device

used.

EQUIPMENT

FURNISHED

-

GENERAL

The

general

purpose

VT-700 Duplex

consists

of

one power and

control

unit

to

operate

the

variable

speed

motor and a

logic

unit

and

a

starter

for

operation

of

the

constant

speed

motor.

2.2.1

Power and

Control

Unit

Input

voltage:

one

of

three:

200, 230

or

460VAC,

3-phase,

60

hertz.

The power

unit

contains

the

SCR

assembly,

the

regulator

and

the

associated

power and

control

components

in

a

floor

mounted

enclosure.

2.2.2

AC

Drive

Motors

Five

to

fifty

horsepower,

four

rated

speed

available,

specially

designed

type

KXA

high-slip,

squirrel

cage

induction

motor

with

thermal

protection.

The

constant

speed

motor

is

a

super

standard

type

K

motor.

2.2.3

Sensor

Normally Honeywell

type

L918,

other

types,

depending upon

application,

are

available.

2.2.4

Special

Purpose

Equipment

See

Elementary

Diagrams.

2.2.5

Receiving,

Handling

and

Storage

2.2.5.1

Receiving

The equipment

should

be

placed

under

adequate

cover

immediately

upon

receipt,

as

packing

cases

are

not

suitable

for

out-of-doors

or

unprotected

storage.

2-1

2.2.5.2

Handling

The power

units,

floor

mounted,

can

be

transported

by

lift

trucks

with

the

forks

completely

under

the

base

of

the

packing

case.

All

power

units

have

two

detachable

lifting

brackets

at

the

top

for

lifting

by

crane.

2.2.5.3

Storage

If

the

equipment

is

not

to

be

installed

immediately,

it

should

be

stored

in

a

clean,

dry

location.

Precau-

tions

should

be

taken

to

prevent

moisture

from accumula-

ting

in

the

equipment.

The

entrance

of

moisture,

dust

or

dirt

during

storage

or

installation

is

detrimental

to

the

equipment

insulation.

2.3

EQUIPMENt

FUNCtIONAL

DESCRIPtION

2.3.1

Function

of

Controls

and

Indicators

table

2-1

will

give

a

listing

of

all

the

controls,

indicators

and

adjustments

with

a

brief

functional

descriPtion.

This

table

is

cross-referenced

to

the

illustrations

of

the

equipment.

2.3.2

Location

of

Controls,

Indicators

and Assemblies

Figure

2-1

through

2-3

provide

pictures

and

illustrations

of

the

equipment

assemblies,

controls

and

indicators

with

a

cross-refer-

ence number

to

identify

the

item

in

table

2-1.

2.3.3

Theory

of

Operation

To

best

understand

the

theory

of

operation

of

the

Vt-700 Duplex

General Purpose

AC

Variable

Torque

Drive

System,

it

is

necessary

to

state

what

the

electrical

system

is

required

to

do.

a.

Maintain

a

required

pr.essure

or

level.

b.

Start,

stop

and

control

motor

to

maintain

the

desired

pressure

or

liquid

level.

c.

Provide

automatic

or

manual

operation.

d.

Insure

operator

safety.

e.

Provide

visual

status

of

normal

operation.

f.

Provide

emergency

override

operation.

2-2

l'h.e

total

system

can

be

divided

into

four

parts

(see

J:':lgure 2

....

4).

The

four

parts

are:

command

and

logic,

regulator,

power

conver-

sion

module and

the

AC

drive

motors.

The

following

is

a

brief

description

of

the

function

of

each

major

portion

of

the

four

parts

of

the

system.

2.3.3.1

Command

and Logic

Circuitry

The

command

and

logic

circuitry

is

responsible

for

the

starting

or

stopping

of

the

system,

providing

the

pro-

tective

logic

and

the

manual

run

control

plus

the

auto-

matic

transfer

between

drive

systems.

The

selection

of

mode

of

operation

(manual

or

automatic)

is

also

included.

2.3.3.2

Regulator

The

regulator's

job

is

to

receive

an

input

signal

from

either

the

sensor

or

the

manual

speed

control

and

pre-

pare

it

as

a

command

signal

to

the

power

conversion

unit.

Its

other

functions

include

system

response,

stability

and power

conversion

module

protection

in

the

form

of

current

limiting.

2.3.3.3

Power

Conversion

Module

The power

conversion

module's

task

is

to

deliver

the

proper

amount

of

voltage

to

the

motor,

based

on

the

commands

received

from

the

regulator,

to

cause

the

motor

to

drive

at

the

correct

speed

corresponding

to

the

re-

quired

torque.

2.3.3.4

AC

Motor(s)

The

"KXA"

AC

motor's

task

is

to

drive

the

pump

as

commanded

by

the

sensor

or

manual

control

input

with

the

motor

drive

power

supplied

from

the

power

conver-

sion

module.

The

"K"

AC

motor

is

a

constant

speed

motor

that

comes

on

(auto

mode) when

the

KXA

motor

cannot

satisfy

the

sensor

demand. As

the

"K"

motor

comes up

to

speed,

the

KXA

motor

decreases

speed

until

the

sensor

demand

is

satisfied.

For

a more

detailed

explanation

of

system

theory

of

operation,

see

Appendix,

Section

IX.

2-3

TABLE

2-1

FUNCTION

OF

CONTRPLS

AND

INDICATORS

EQUIPMENT/ITEM

Control

Unit

D0(b

CONTROL/INDICATOR

(Fig.

2-1)

Circuit

Breaker

"ON-OFF"

Control

Handle

"ON"

Indicator

"START"

Pushbutton

"STOP"

Pushbutton

"MOTOR

RUN"

Indicator

"NO.1

AUTO-NO.2

MODE"

Selector

Switch

"ALABM"

Indicator

Manual Speedpot

2-4

FUNCTION

Controls

application

of

three

phase,

a-c

power

input

to

drive

system.

Provides

an

indication

that

the

"START"

button

has

been

pressed

and

the

"RUN"

relay

has

energized

and

there

are

no

"faults

ll

in

the

system.

Applies

ll5VAC

to

the

"RUN"

relay

coil

and power

"ON"

indicator.

Interrupts

l15VAC

to

the

"RUN"

relay

coil

which

causes

the

power

"ON"

light

to

extinguish,

and

also

connects

the

regulator

input

signal

to

common,

causing

the

motor

to

stop.

Provides

a

visual

indication

of

motor run

voltage;

brilliance

will

increase

as

the

voltage

or

motor speed

increases.

In

Position

No.

1

the

variable

speed

motor

may

be

operated

in

manual.

In

the

auto

position

the

drive

system

operates

as

a

function

of

sensor

reference.

In

the

No.

2

Position

the

con-

stant

speed

motor

may

be

operated

at

rated

speed

for

emergency

operation.

With

the

application

of

external

l15VAC

to

the

alarm

circuit,

this

indicator

will

illuminate

when-

ever

there

is

a

fault

due

to

a

problem

or

malfunction

in

the

system.

With

mode

selector

switch

in

No.

1

Position,

provides

a means

of

set-

ting

in

a

constant

speed

command

TABLE

2-1

FUNCTION

OF

CONTROLS

AND

INDICATORS

EQUIPMENT/ITEM

@

@@@

Transfer

Func-

tiobTRFUNC

®

CONTROL/INDICATOR

FUNCTION

(Fig.

2-2)

Supplies

±20VDC

for

regulator

and

±20VDC

Power Supply

sensor

power. Fused

inputs

FUAl

Card (no

adjustments)

and

2.

"Coordination"

Card

Provides

input

signal

amplifica-

tion,

motor

response,

and

stability

adjustments

and

the

oscillator

circuit.

"Stability"

Adjust

Potentiometer

"Range"

Adjust

Potentiometer

"Response"

Adjust

Potentiometer

Provides

a means

of

fine

tuning

the

response

of

the

motor

to

eliminate

speed

variations.

Provides

a means

of

electrically

center~ng

sensor

pickoff

arm

to

provide

balanced

range.

Provides

a means

of

setting

the

system

sensitivity

to

control

the

motor

response

time

to

a

pressure

change.

"Driver

Coordination'

Provides

signal

amplification

and

Card

current

limit

circuit

with

adjustments.

"Current

Limit"

Adjust

Potentiometer

"Zero

Adj"

Potentiometer

"Gate

Pulse

Generator"

Cards

(Fig.

2-3)

Balance

Pot

P322

2-5

Provides

an

adjustment

range

for

overcurrent

protection

for

the

SCR's

(normally

set

at

130%).

Provides

a means

of

min1m1zing

the

output

with

no

input

applied.

Provides

the

pulse

trains

to

the

SCR

modules

in

the

proper

time

sequence

and

phase

for

firing

the

SeR's

causing

the

right

amount

of

voltage

at

the

motor

to

increase

or

decrease

the

motor

torque.

Provides

a means

of

adjusting

the

point

where

the

constant

speed

motor comes

on.

FIGURE 2 - 1 LOCATION

OF

CONTROLS

AND

INDICATORS

CONTROL

UNIT

fCU) DOOR

2·6

'"

I

.....

NOTE:

Before replacing fuse(s)

check for possible short circuit(s)

acrossthe power supply output(s).

Replace fuse only with one of the

same type and rating for maximum

protection.

50

n

~

»0

."

cz

-c.. o

e;')

C

5i."

:xJ

-1::0

m

3:m

N

me;')

I

Zc

N

~c

~

0

::0

193X741ABG03

STABILITY

~

fRl

AAHGE

~

ADJ.

@

193X237

AAGOl

~

CURRENT

~

LIMIT

(R\

ZENO

~~

ADJ.

®

193X236ABGOl

NOTE:

These

cards

have

been factory bijl_d for this application.

Therefore card frequency

may

be

different than drive fre-

quency. Refer

to

instruction bobk before changing.

® ® ®

193X235ACGOl

RUN

AUTO

SPR

FIGURE

2·3

LOCATION

OF

ASSEMBLIES

AND

CONTROLS INSIDE CONTROL

UNIT

{CUI.

2·8

N

I

\C

Jl

G')

C

~

i

I!

"

!:

."

in

c

~

c

~

::u

~

i

c

•

r-

m

><

PWR

"ON"

...--!

START

AUTO

NO.1

NO.2

STOP

PUMP

~

PUMP

I

.Jr."

'"

"-0

cr-:-o

I0 COMMAND

AND

LOGIC

AUTO

NO.2

PUMP

TRANSFER

FUNCTION

to----

11&VAC EXT.

PWR.

DRIVER

POWER

o , 0 C •

CPT

115V

-

REGULATOR

200, 230,

OR

460V,

~PH,

60

HE

RTZ

A

)CB

CONVERSION

MOT. 1 RUN

j ,

MOT. 2 RUN

PUMP

-E}

-~

3.1

GENERAL

SECTION

III

INSTALLATION

There

are

different

types

of

drawings/diagrams

created

for

specific

purposes.

The

type

of

drawing/diagram

is

noted

in

the

title

block

of

each

diagram

sheet.

The

three

major

types

of

diagrams

are

elementary

(sometimes

referred

to

as

schematic),

connection

and

interconnection.

a.

The

Elementary

Diagram

represents

(in

symbolic

form)

the

fundamental

operation

and.relationship

of

the

electrical

parts

of

a

system.

These

diagrams

are

drawn

in

such

a manner

that

the

operation

of

the

control

is

easily

understood.

Mechanical

relationships

of

control

devices

are

subordinated

to

the

most

simple

presentation

of

the

electrical

circuits.

b.

The

Connection

Diagram

is

one

which

shows

the

relative

physical

position

of

the

devices

on

the

control

panel~s

well

as

other

electrical

components

located

within

the

same

enclosure.

Actual

wire

connections

made

between

control

devices

and power

devices

within

the

enclosure,

as

well

as

outgoing

terminal

points,

are

shown on

this

type

diagram.

c.

The

Interconnection

Diagram

indicates

the

type

and number

of

con-

nections

to

be

made

between

major

components

of

the

system

(power

unit,

motor

and

sensing

device),

the

power'~ource,

and

auxiliary

devices.

3.2

EQUIPMENT

LOCATION

Speed

Variator

power

units

are

suitable

for

most

building

areas

where

other

equipment

is

installed.

Locations

subject

to

steam

vapors

or

excess

moisture,

oil

vapors

or

chemical

fumes

should

be

avoided.

Power

units

should

be

installed

in

a

well-ventilated

area

not

subjected

to

excessive

heat

(above 1040F).

WARNING

EQUIPMENT

SHOULD

NEVER

BE

INSTALLED

WHERE

HAZARDOUS,

INFLAMMABLE

OR

COMBUSTIBLE

VAPORS

OR

.DUSTS

ARE

PRESENT.

DRIVE

POWER

UNITS

SHOULD

BE

INSTALLED

A~AY

FROM

HAZARD-

OUS

AREAS,

EVEN

IF

USED

WITH

AC

MOTORS

SUITABLE

FOR

USE

IN

SUCH

LOCATIONS.

When

installing

units

provide

f)r

sufficient

clearance

in

front

of

doors

to

allow

access

to

unit.

3-1

3.3

TOOLS

REQUIRED

The normal

electrical

and

mechanical

tool

boxes

maintained

in

most

buildings

plus

a

lifting

deVice ("A" frame)

with

hooks and

sling

or

fork

lift.

Mounting

holes

for

the

power

unites)

are

suitable

for

3/8

incn

mount-

ing

bolts

and

flat

washers.

(Recommend

a

minimum

of

four

bolts

per

enclosure

base.)

A

volt-ohm

meter

(VOM)

is

required

for

verifying

continuity

and

making

voltage

measurements.

A clamp-on ammeter

is

required.

3.4

MECHANICAL

INSTALLATION

3.4.1

Power Unit

Refer

to

outline

drawing

for

mounting

dimensions

and equipment

weights.

3.4.2

Pressure

Sensor

The recommended

installation

of

the

sensor

is

pictured

in

Figure

3-1.

Any

installation

other

than

the

ones

pictured

in

Figure

3-1

may

cause

fa1s.e

or

faulty

system

operation

due

to

water

turbulence,

hammer

or

incorrect

sensing.

3.4.3

Motor

Except

for

close

coupled

pumps,

use

of

flexible

couplings

between

the

motor and

the

pump,

to

compensate

for

possible

misalignment

is

recommended.

To

minimize

introducing

noise

into

the

hydraulic

system,

it

may

be

desirable

to

provide

vibration

isolation

between

the

motor

base

and

the

foundation,

as

well

as

flexible

couplings

between

suction

and

discharge

parts

of

the

pump

and

distribution

piping.

3.5

ELECTRICAL

WIRING

AND

INTERCONNECTION

All

wiring

shall

be

in

accordance

with

the

National

Electrical

Code

and

be

consistent

with

all

local

codes.

All

internal

electrical

con-

nections

between components and

the

power

units

were

made

at

the

General

Electric

Factory.

When

installing

units,

all

connections

should

be

checked

for

tightness.

Connections

may

become

loose

in

shipping

or

storage.

A

diagram

showing

the

connections

between

the

power

unit

and

the

is

furnished

with

each

equipment.

All

terminals

to

which

the

external

connections

are

to

be

made

are

numbered on

the

equipment

as

indicated

on

the

connection

diagram.

The equipment

should

be

wired

as

per

the

interconnection

diagram

and

verified

by

continuity

3-2

tests.

It

is

recommended

as

each

connection

lor

wire

is

connected

to

the

equipment,

that

it

be

checked

off

on

the

interconnection

diagram

and

the

wire

labeled

to

indicate

where

it

is

connected.

When

sensor

leads

are

connected,

it

is

recommended

that

they

be

run

in

separate

conduit

from

the

motor

armature

leads.

WARNING

ALL

MOTOR

BASES

AND

EQUIP-

MENT

ENCLOSURE

HOUSINGS

SHOULD

BE

CONNECTED

TO

THE

BUILDING

OR

FACILITY

EARTH

GROUNDING

SYSTEM

IN

ACCORD-

ANCE

WITH

THE

NATIONAL

ELEC-

TRICAL

CODE.

If

a

separate

AC

line

breaker,

switch

and/or

fuse

is

used,

the

device

and

fuse

selection

should

be

in

accordance

with

the

National

Electrical

Code

and/or

local

requirements

based

on power

unit

Input

data.

Codes

generally

require

the

use

of

a

fused

disconnecting

switch

or

circuit

breaker.

CAUTION

MAKE

CERTAIN

THE

INPUT

VOL-

TAGE,

FREQUENCY

AND

PHASE

OF

THE

POWER

SUPPLY

AGREE

WITH

THE

POWER

UNIT

NAMEPLATE

ON

THE

CONTROL

PANEL

INSIDE

THE

ENCLOSURE.

IT IS

NECESSARY

ON

THE

THREE

PHASE

POWER

UNITS

TO

CONNECT

THE

AC

SUPPLY

IN

THE

CORRECT

PHASE

SEQUENCE

FOR

THE

PROPER

DIRECTION

OF

MOTOR

ROTATION.

Conduit

entrance

can

be

made

th!ough

the

top,

ends

or

bottom

of

the

power

unit

enclosure.

Recommended

entry

for

power and

control

leads

is

through

the

base

or

the

top

near

the

left

end

of

the

enclosure.

Entrance

of

conduit

through

other

than

the

left

end

of

the

base

or

top

may

be

blocked

by components.

Protect

electrical

circuit/

com-

ponents

when

cutting

conduit

entrance

by

covering

them.

CAUTION

DO

NOT

GROUND

ANY

POWER

OR

CONTROL

CIRCUITS

OF

THE

VT-70D

DRIVE

UNLESS

NOTED

ON

THE

DIAGRAMS.

NATIONAL

ELECTRICAL

CODE

AND

SOUND

LOCAL

PRACTICES

SHOULD

BE

CONSULTED

FOR

FURTHER

REQUIRE-

MENTS.

3-3

GE VT-700 User manual

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