Yaskawa VCD 723 - Manual (Page 73)

4 Troubleshooting/Maintenance
67 Troubleshooting Flowcharts
9/15/93
Chart 8. Overload ( oL ) Fault Indication
LOAD TOO LARGE
(MOTOR OVERHEATED)?
YES
YES
YES
YES
YES
DECREASE LOAD
WITHIN RATING.
CHECK MOTOR
AND LOAD.
CONSULT
FACTORY.
NO
NO
NO
NO
NO
WITH DRIVE IN
STOPPED CONDITION,
REPROGRAM PER PAC
DIAGRAM.
IS VCD 723 CAPACITY
FACTORY SET
CORRECTLY?
IS CORRECT
CURRENT RATING
DISPLAYED?
DISCONNECT WIRING FROM
OUTPUT TERMINALS T1(U),
T2(V) AND T3(W). IS OL
STILL INDICATED?
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.
ERRONEOUS OPERATION
DUE TO NOISE?