Name: Graham 1703 Series
Brand: Graham
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tion is now full speed (no variable speed control)

when the customer’s motor starter is energized.

3.2.53.2.5

3.2.5

DRIVE/OFF/LINE/TESTDRIVE/OFF/LINE/TEST

DRIVE/OFF/LINE/TEST

TRANSFER SWITCH TRANSFER SWITCH

TRANSFER SWITCH (op-

tional)

This option combines four functions. It acts as a

motor transfer switch, motor disconnect switch,

drive input disconnect switch, and drive test

mode for service and maintenance while system

operation is maintained in bypass. This option

may be supplied either with or without a motor

starter. A motor starter is required for LINE

operation.

DRIVEDRIVE

DRIVE - The motor is connected to the output

of the drive and power is connected to the input

of the drive. Motor speed is controlled by the

drive.

OFFOFF

OFF - The motor and the drive are discon-

nected from the power source. The switch acts

as a drive input disconnect switch and a bypass

input disconnect switch to isolate the drive and

motor from power sources during service and

maintenance functions.

LINELINE

LINE - The motor is connected to the bypass

motor starter for full speed operation. Power is

disconnected from the drive input and the mo-

tor is isolated from the drive output for service

functions on the drive without interruption of

customer operation. If the motor starter is sup-

plied by Graham, the LINE ON/OFF switch

controls the starter.

TESTTEST

TEST - The motor is connected to the bypass

motor starter for continued operation of the

customer’s application at full speed while test-

ing the drive under power. The test mode dis-

connects the motor from the output of the drive

and connects power to the input of the drive for

operational testing without the motor.

DANGER

DO NOT OPERATE ANY OF THEDO NOT OPERATE ANY OF THE

DO NOT OPERATE ANY OF THE

STANDARD OPTION SWITCHESSTANDARD OPTION SWITCHES

STANDARD OPTION SWITCHES

WHILE THE MOTOR IS RUNNING,WHILE THE MOTOR IS RUNNING,

WHILE THE MOTOR IS RUNNING,

OR WHILE THE CUSTOMER’S MO-OR WHILE THE CUSTOMER’S MO-

OR WHILE THE CUSTOMER’S MO-

TOR STARTER IS ENERGIZED. AL-TOR STARTER IS ENERGIZED. AL-

TOR STARTER IS ENERGIZED. AL-

WAYS STOP THE DRIVE OR MO-WAYS STOP THE DRIVE OR MO-

WAYS STOP THE DRIVE OR MO-

TOR STARTER OPERATION BE-TOR STARTER OPERATION BE-

TOR STARTER OPERATION BE-

FORE OPERATING AN INPUT DIS-FORE OPERATING AN INPUT DIS-

FORE OPERATING AN INPUT DIS-

CONNECT, MOTOR DISCONNECT,CONNECT, MOTOR DISCONNECT,

CONNECT, MOTOR DISCONNECT,

MOTOR TRANSFER SWITCH ORMOTOR TRANSFER SWITCH OR

MOTOR TRANSFER SWITCH OR

DRIVE/OFF/LINE/TEST SWITCH.DRIVE/OFF/LINE/TEST SWITCH.

DRIVE/OFF/LINE/TEST SWITCH.

3.2.63.2.6

3.2.6

INTERLOCKEDINTERLOCKED

INTERLOCKED

CONTACTOR BYPASSCONTACTOR BYPASS

CONTACTOR BYPASS (op-

tional)

Interlocked contactor bypass is the use of two

interlocked conventional motor starter contac-

tors to provide the ability to transfer the motor

to full speed operation in the event of a drive

fault or during maintenance. This circuitry can

be operated manually or automatically. When

the drive is equipped with this option, the front

panel has three additional switches and three

additional panel indicator lamps labeled

DRIVE, OFF and LINE.

The DRIVE/OFF/LINE selector switches allow

the user to select:

1. Variable speed from the drive. (DRIVE)

2. Disconnection of the motor from the

drive and the motor starter. (OFF)

3. Constant full speed operation from a

conventional motor starter. (LINE)

DRIVEDRIVE

DRIVE - The motor operates with variable

speed operation from the drive. The DRIVE

lamp on the front panel is illuminated. Inter-

locks from the energized DRIVE contactor lock

the bypass motor starter out of operation.

OFFOFF

OFF - The motor is disconnected from both the

drive and the bypass power sources. The OFF

lamp on the front panel is illuminated. The

drive contactor and the line contactor are dis-

abled.

LINELINE

LINE - The motor operates at a constant speed

from the motor starter connected to the utility

power line. The LINE lamp on the front panel is

illuminated. Interlocks from the energized

LINE contactor lock the drive in the stop mode

and the drive contactor in the de-energized

mode to prevent backfeeding of utility power to

the drive.

AUTO TRANSFERAUTO TRANSFER

AUTO TRANSFER (If provided) Automatic

transfer to the bypass mode (LINE) is accom-

plished by recognition of a fault condition in the

drive circuitry which does not reset and restart

the drive in a designated amount of time. If the

fault condition resets within the time delay, the

LINE transfer system is not activated. If the

fault condition does not reset within the allot-

ted time delay period, the LINE contactor is en-

Brand	Graham
Model	1703 Series
Category	DC Drives
Language	English

Graham 1703 Series User Manual

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Graham 1703 Series Specifications