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drives. Retorque the mounting screws and wiring screws

to 53 inch pounds on the 65 through 100 amp drives.

Refer to the “Output Drive Current” rating on the

plastic cover over the control board for this value.

9.6.59.6.5

9.6.5

CONDUCTION/COMMUTATIONCONDUCTION/COMMUTATION

CONDUCTION/COMMUTATION

TRANSISTOR MODULETRANSISTOR MODULE

TRANSISTOR MODULE

The dual transistor module designated Q1 is the con-

duction/commutation transistor module. When chang-

ing this module, a new thermal pad, or heatsink com-

pound, must be used. Use Thermalcote

, manufactured

by Thermalloy, Inc. or equivalent heatsink compound

and apply a layer 1 mil thick. The heatsink must be

thoroughly cleaned before reassembly. Retorque the

mounting screws to 26 inch pounds and the wiring

screws to 17 inch pounds on the 7.5 through 28 amp

drives. Retorque the mounting screws and wiring screws

to 26 inch pounds on the 34 through 100 amp drives.

Refer to the “Output Drive Current” rating on the

plastic cover over the control board for this value.

9.7 POWER UP SEQUENCE9.7 POWER UP SEQUENCE

9.7 POWER UP SEQUENCE

DANGER

HIGH VOLTAGE WILL BE PRESENTHIGH VOLTAGE WILL BE PRESENT

HIGH VOLTAGE WILL BE PRESENT

IN THE DRIVE WHEN PERFORM-IN THE DRIVE WHEN PERFORM-

IN THE DRIVE WHEN PERFORM-

ING OPERATIONAL TESTS WITHING OPERATIONAL TESTS WITH

ING OPERATIONAL TESTS WITH

POWER APPLIED TO THE DRIVE.POWER APPLIED TO THE DRIVE.

POWER APPLIED TO THE DRIVE.

Apply input power to the drive. All the LEDs on the

control chip board should light for approximately one

second. Then, if the drive is in the stop mode, all but the

READY and TEMP LEDs should turn off.

On the control board, the COMM P.S. LED should light

immediately after power is applied. After approxi-

mately one second, the COND. DRIVE LED should

light, and the COMM. DRIVE LED should flash very

dimly.

9.8 POWER SUPPLY ON THE9.8 POWER SUPPLY ON THE

9.8 POWER SUPPLY ON THE

CONTROL BOARDCONTROL BOARD

CONTROL BOARD

Power supply common is connected to J6-19 on the

control board which connects to J3-19 on the control

chip board. Connection to common is also available

from the top side of R67. R67 is a 2 watt resistor located

on the extreme lower right hand corner of the Control

Board. These circuit common points can be used for test

equipment connection for the following steps.

9.6 DIODE, TRANSISTOR AND SCR9.6 DIODE, TRANSISTOR AND SCR

9.6 DIODE, TRANSISTOR AND SCR

REPLACEMENTREPLACEMENT

REPLACEMENT

9.6.1 INPUT SCR MODULES9.6.1 INPUT SCR MODULES

9.6.1 INPUT SCR MODULES

SCRs designated SCR 7/10, SCR 8/11, SCR 9/12 are

input SCR modules. When changing an input SCR

module, use a new thermal pad or apply heatsink

compound. Use Thermalcote

, manufactured by Ther-

malloy, Inc., or equivalent heatsink compound and

apply a 1 mil thick layer. The heatsink must be thor-

oughly cleaned before reassembly. Retorque the mount-

ing screws and wire screws to 35 inch pounds.

9.6.29.6.2

9.6.2

OUTPUT SCR MODULESOUTPUT SCR MODULES

OUTPUT SCR MODULES

SCRs designated SCR 1/4, SCR 2/5, SCR 3/6 are output

SCR modules. When changing an output SCR module,

a new thermal pad, or heat sink compound, must be

used. Use Thermalcote

, manufactured by Thermalloy,

Inc. or equivalent for heatsink compound and apply a

layer 1 mil thick. The heatsink must be thoroughly

cleaned before reassembly. Retorque the mounting

screws and wiring screws to 35 inch pounds on the 7.5

through 53 amp drives. Retorque the mounting screws

and wiring screws to 55 inch pounds on the 65 through

100 amp drives. Refer to the “Output Drive Current”

rating on the plastic cover over the control board for

this value.

9.6.39.6.3

9.6.3

OUTPUT DIODE BRIDGEOUTPUT DIODE BRIDGE

OUTPUT DIODE BRIDGE

The diode bridge designated D BRDG 1 is the output

diode bridge module When changing a diode bridge

module, a new thermal pad, or heatsink compound,

must be used. Use Thermalcote

, manufactured by

Thermalloy, Inc. or equivalent heatsink compound and

apply a layer 1 mil thick. The heatsink must be thor-

oughly cleaned before reassembly. Retorque the mount-

ing screws to 18 inch pounds on the 7.5 through 34 amp

drives. Retorque the mounting screws and wiring screw

to 44 inch pounds on the 40 through 100 amp drives.

Refer to the “Output Drive Current” rating on the

plastic cover over the control board for this value.

9.6.4.9.6.4.

9.6.4.

FREE-WHEELING DIODEFREE-WHEELING DIODE

FREE-WHEELING DIODE

The diode module designated D1 is the free-wheeling

diode module. When changing a diode module, a new

thermal pad, or heatsink compound, must be used. Use

Thermalcote

, manufactured by Thermalloy, Inc. or

equivalent heatsink compound and apply a layer 1 mil

thick. The heatsink must be thoroughly cleaned before

reassembly. Retorque the mounting screws and wiring

screws to 35 inch pounds on the 7.5 through 53 amp

Brand	Graham
Model	1703 Series
Category	DC Drives
Language	English

Graham 1703 Series User Manual

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Questions and Answers:

Graham 1703 Series Specifications