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Check the +24 V DC power supply on J6-17 on the

Control Board for +20 to +30 V DC.

Check the -24 V DC power supply on J6-20 on the

Control Board for -20 to -30 V DC.

Check the +15 V DC power supply on J6-15 on the

Control Board for +14.4 to +15.6 V DC.

Check the -15 V DC power supply on J6-16 on the

Control Board for -14.4 to -15.6 V DC.

Check the +5 V DC power supply on J4-19 on the

Control Board for +4.8 to +5.2 V DC.

An oscilloscope should also be used in checking the

above voltages to ensure that there is no excessive

ripple voltage in these DC power supplies.

9.9 OUTPUT CHECKS9.9 OUTPUT CHECKS

9.9 OUTPUT CHECKS

Start the drive and accelerate the motor to full speed.

Measure the phase to phase voltage on the motor leads.

These should be balanced within ±0.5 V AC. Any lack

of balance indicates a problem with the motor wind-

ings, the wiring to the motor or the inverter circuits in

the drive.

NOTE: BECAUSE THE OUTPUT OFNOTE: BECAUSE THE OUTPUT OF

NOTE: BECAUSE THE OUTPUT OF

THE DRIVE IS NOT A PURE SINETHE DRIVE IS NOT A PURE SINE

THE DRIVE IS NOT A PURE SINE

WAVE, THE METER MAY NOT READWAVE, THE METER MAY NOT READ

WAVE, THE METER MAY NOT READ

THE RATED AC OUTPUT VOLTAGE.THE RATED AC OUTPUT VOLTAGE.

THE RATED AC OUTPUT VOLTAGE.

THIS IS NOT A CAUSE FOR CON-THIS IS NOT A CAUSE FOR CON-

THIS IS NOT A CAUSE FOR CON-

CERN. THIS CHECK IS ONLY FORCERN. THIS CHECK IS ONLY FOR

CERN. THIS CHECK IS ONLY FOR

VOLTAGE BALANCE BETWEENVOLTAGE BALANCE BETWEEN

VOLTAGE BALANCE BETWEEN

THE OUTPUT PHASES AND NOTTHE OUTPUT PHASES AND NOT

THE OUTPUT PHASES AND NOT

THE EXACT VOLTAGE READINGS.THE EXACT VOLTAGE READINGS.

THE EXACT VOLTAGE READINGS.

WARNING

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 THE OPERATIONAL TESTSING THE OPERATIONAL TESTS

ING THE OPERATIONAL TESTS

WITH POWER APPLIED TO THEWITH POWER APPLIED TO THE

WITH POWER APPLIED TO THE

DRIVE. THE POWER CIRCUITS OFDRIVE. THE POWER CIRCUITS OF

DRIVE. THE POWER CIRCUITS OF

THE DRIVE NECESSARILY FLOATTHE DRIVE NECESSARILY FLOAT

THE DRIVE NECESSARILY FLOAT

AT A HIGH VOLTAGE ABOVEAT A HIGH VOLTAGE ABOVE

AT A HIGH VOLTAGE ABOVE

GROUND POTENTIAL. BOTHGROUND POTENTIAL. BOTH

GROUND POTENTIAL. BOTH

LEADS OF ANY TEST EQUIPMENTLEADS OF ANY TEST EQUIPMENT

LEADS OF ANY TEST EQUIPMENT

THAT IS CONNECTED TO THETHAT IS CONNECTED TO THE

THAT IS CONNECTED TO THE

DRIVE'S POWER CIRCUITS WILLDRIVE'S POWER CIRCUITS WILL

DRIVE'S POWER CIRCUITS WILL

ALSO BE AT A HIGH VOLTAGE WITHALSO BE AT A HIGH VOLTAGE WITH

ALSO BE AT A HIGH VOLTAGE WITH

RESPECT TO GROUND. INSTRU-RESPECT TO GROUND. INSTRU-

RESPECT TO GROUND. INSTRU-

MENTS CONNECTED TO THEMENTS CONNECTED TO THE

MENTS CONNECTED TO THE

POWER CIRCUITS MUST HAVEPOWER CIRCUITS MUST HAVE

POWER CIRCUITS MUST HAVE

BOTH LEADS ISOLATED FROMBOTH LEADS ISOLATED FROM

BOTH LEADS ISOLATED FROM

EARTH GROUND. IF ONE TESTEARTH GROUND. IF ONE TEST

EARTH GROUND. IF ONE TEST

LEAD IS CONNECTED TO THE CASELEAD IS CONNECTED TO THE CASE

LEAD IS CONNECTED TO THE CASE

OF THE TEST INSTRUMENTS, THEOF THE TEST INSTRUMENTS, THE

OF THE TEST INSTRUMENTS, THE

TEST INSTRUMENT’S CASE WILLTEST INSTRUMENT’S CASE WILL

TEST INSTRUMENT’S CASE WILL

ALSO BE AT A HIGH VOLTAGE WITHALSO BE AT A HIGH VOLTAGE WITH

ALSO BE AT A HIGH VOLTAGE WITH

RESPECT TO EARTH GROUND.RESPECT TO EARTH GROUND.

RESPECT TO EARTH GROUND.

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