Yaskawa VCD 723 - Manual (Page 69)

4 Troubleshooting/Maintenance
63 Troubleshooting Flowcharts
9/15/93
Chart 4. Motor Hunting
PROPER PHASE SEQUENCE
OF CONNECTIONS
FROM DRIVE TO MOTOR?
NO
CHECK CONNECTIONS
FOR PROBLEM AND
REPAIR.
YES
ALL PARAMETER SETTINGS
RELATED TO ASR
PROPER FOR APPLICATION?
DOES MOTOR STILL
HUNT?
WITH DRIVE IN STOPPED
CONDITION, REDUCE APPLICABLE
ASR PROPORTIONAL GAIN
SETTING.
NO
NO
CHECK SETTINGS;
REPROGRAM
AS REQUIRED.
DETERMINE THE
OPTIMUM SETTING FOR
WHICH THE MOTOR
WILL NOT HUNT.
VERIFY TACHOMETER
SIGNALS FOR
CORRECT WAVEFORM.
YES
YES
NO
EXCESSIVE
MECHANICAL SYSTEM
CHATTER?
NO
ERRONEOUS
OPERATION DUE
TO NOISE?
YES
CHECK FOR
PROBLEM IN MOTOR,
MECHANICAL SYSTEM
OR BRAKE.
REDUCE ASR OUTPUT
LAG TIME BY
SMALL AMOUNTS UNTIL
AMOUNT OF CHATTER
IS ACCEPTABLE.
YES
CONSULT
MAGNETEK.