Yaskawa VCD 723 - Manual (Page 70)

NO
4 Troubleshooting/Maintenance
64 Troubleshooting Flowcharts
9/15/93
Chart 5. Overvoltage ( ou ) Fault Indication
IS INPUT AC SUPPLY
VOLTAGE CORRECT?
NO
NO
NO
NO
DECREASE TO
PROPER VOLTAGE
RANGE.
YES
YES
YES
YES
YES
DOES OV TRIP
OCCUR ONLY
DURING DECEL-
ERATION?
DOES OV TRIP
STILL OCCUR
DURING DECEL-
ERATION?
WITH DRIVE IN
STOPPED CONDITION,
INCREASE DECELER-
ATION TIME BY
REPROGRAMMING
PER PAC DIAGRAM.
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 SIGNALS TO
BASE DRIVE PCB ARE
FAULTY. REPLACE
CONTROL PCB.
IS BRAKING
OPTION
INSTALLED?
ADD BRAKING OPTION,
OR REPLACE DRIVE
WITH ONE OF LARGER
CAPACITY. CHECK LOAD
INERTIA
REQUIREMENTS.
IS DC BUS
VOLTAGE
CORRECT?
YES