Yaskawa GPD503 Drive User Manual

Page 119

TROUBLESHOOTING CHART 7.5

OVERCURRENT (

) FAULT INDICATION

DOES OUTPUT

CURRENT EXCEED

200% OF RATING?

WITH GPD 503 IN STOPPED CON-
DITION, INCREASE ACCELERATION
TIME BY REPROGRAMMING bn-01
OR bn-03, IF OC TRIP OCCURS ONLY
DURING ACCELERATION.
OTHERWISE, REDUCE LOAD.

YES

DOES OC TRIP

OCCUR, OR MAIN CIR-

CUIT CONTACTOR

TRIP, WHEN POWER

IS TURNED ON?

MACHINE JAMMED

OR MOTOR

FAILURE?

CLEAR JAM, OR
REPLACE MOTOR.

DISCONNECT WIRING

FROM OUTPUT TERMINALS

T1, T2 AND T3 AND

CHECK LOAD IMPEDANCE.

CHECK POWER

TRANSISTORS

(SEE APPENDIX 4).

ARE TRANSISTORS

DAMAGED?

REPLACE
DAMAGED POWER
TRANSISTORS.

WITH GPD 503 IN STOPPED
CONDITION, INCREASE
ACCELERATION TIME BY
REPROGRAMMING bn-01
OR bn-03.

DOES OC TRIP
STILL OCCUR?

DECREASE
LOAD INERTIA.

MOTOR STARTED BY CONTACTS

WIRED BETWEEN GPD 503

AND MOTOR?

- REWIRE TO ELIMINATE MOTOR

FULL VOLTAGE STARTING.

- REPLACE GPD 503 WITH

ONE OF LARGER CAPACITY.

ERRONEOUS OPERATION

DUE TO NOISE?

REMOVE NOISE SOURCE:

• CONNECT SURGE SUPPRESSOR
TO RELAY AND MAGNETIC CON-
TACTOR COILS.

• PROVIDE LINE FILTER TO
REMOVE NOISE ON INPUT
POWER LINE.

CONTROL PCB OR BASE
DRIVE PCB IS FAULTY.
REPLACE FAULTY BOARD.

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