Yaskawa VCD 723 - Manual (Page 75)

4 Troubleshooting/Maintenance
69 Troubleshooting Flowcharts
9/15/93
Chart 10. Inverter Overheated ( oH ) Fault Indication
IS AMBIENT
TEMPERATURE
45°C (113°F)
OR GREATER?
REDUCE AMBIENT
TEMPERATURE. YES
YES
YES
YES
NO
NO
NO
NO
IS HEAT SINK
CLEAN?
INTERNAL
COOLING FAN
STOPPED?
CLEAN HEAT
SINK.
REPLACE
COOLING FAN.
ERRONEOUS OPERATION
DUE TO NOISE?
CONTROL PCB OR BASE
DRIVE PCB IS FAULTY.
REPLACE FAULTY BOARD.
REMOVE NOISE SOURCE:
• CONNECT SURGE
SUPPRESSOR TO RELAY
AND MAGNETIC CON-
TACTOR COILS.
• PROVIDE LINE FILTER
TO REMOVE NOISE ON
INPUT POWER LINE.