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ergized. At the time the LINE contactor is acti-

vated:

1. The DRIVE contactor is de-energized to

isolate the motor and utility power from

the output of the drive to prevent

backfeeding.

2. The drive’s emergency shutdown cir-

cuitry is activated.

The required time delay before automatic

transfer is determined by the application and

the amount of inertia in each individual sys-

tem. Delay time selection is determined by

4TMR3 in the bypass circuitry.

3.2.73.2.7

3.2.7

TRANSFER SWITCH MOTORTRANSFER SWITCH MOTOR

TRANSFER SWITCH MOTOR

SELECTIONSELECTION

SELECTION (optional)

This three position manual switch will connect

the output of the drive to either motor #1 or

motor #2. In the middle “OFF” position, neither

motor is connected to the drive.

WARNING

DO NOT TURN THIS SWITCH UN-DO NOT TURN THIS SWITCH UN-

DO NOT TURN THIS SWITCH UN-

LESS THE DRIVE AND BOTH MO-LESS THE DRIVE AND BOTH MO-

LESS THE DRIVE AND BOTH MO-

TORS ARE STOPPEDTORS ARE STOPPED

TORS ARE STOPPED

This switch is interlocked with the drive to

shutdown the drive if the switch is turned while

the drive is running.

3.2.83.2.8

3.2.8

CONTACTOR MOTORCONTACTOR MOTOR

CONTACTOR MOTOR

SELECTIONSELECTION

SELECTION (optional)

When motor alternation is required for an ap-

plication which has a backup or redundant sys-

tem, such as a lead/lag pumping system, CON-

TACTOR MOTOR SELECTION is typically

provided.

In this system only one motor may be operated

at any time. Motor operation is determined via

a three position door mounted selector switch.

Motor #1 position connects that motor to the

drive through a contactor. Motor # 2 position

connects that motor through a second contac-

tor. With the switch in the AUTO position, mo-

tor selection is determined via a customer con-

tact closure.

Brand	Graham
Model	1703 Series
Category	DC Drives
Language	English

Graham 1703 Series User Manual

Table of Contents

Questions and Answers:

Graham 1703 Series Specifications