Yaskawa GPD503 Drive - Manual (Page 121)

TROUBLESHOOTING CHART 7.7
UNDERVOLTAGE ( Uu ) FAULT INDICATION
IS INPUT AC
SUPPLY
CORRECT?
NO
NO
YES
YES
NO
YES
IS THERE
AT LEAST 450VDC
(FOR 460V GPD 503) OR
225VDC (FOR 230V GPD 503)
FROM TERMINAL B1 TO
B2 (OR B0 TO B1)?
- INCREASE VOLTAGE
WITHIN PROPER RANGE.
- CHECK WIRING BETWEEN
MAIN AC CONTACTOR
AND GPD 503.
GPD 503
IS FAULTY.
REMOVE NOISE SOURCE:
• CONNECT SURGE
SUPPRESSOR TO RELAY
AND MAGNETIC CON-
TACTOR COILS.
• PROVIDE LINE FILTER
TO REMOVE NOISE ON
INPUT POWER LINE.
ERRONEOUS OPERATION
DUE TO NOISE?
CONTROL PCB OR BASE
DRIVE PCB IS FAULTY.
REPLACE FAULTY BOARD.
7-9