Yaskawa GPD503 Drive - Manual (Page 119)

TROUBLESHOOTING CHART 7.5
OVERCURRENT ( oC ) 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
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
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.
7-7