Yaskawa GPD503 Drive - Manual (Page 118)

TROUBLESHOOTING CHART 7.4
BLOWN FUSE ( FU ) FAULT INDICATION
CAUTION
Do not replace DC Bus fuse without first
checking output transistors.
DISCONNECT LEADS FROM
OUTPUT TERMINALS
T1 (U), T2 (V) AND T3 (W).
ARE MOTOR WINDINGS
SHORTED (T1 TO T2,
T2 TO T3, OR T3 TO T1)?
MOTOR
IS FAULTY.
LOCATE AND
REMOVE SHORT.
REPLACE
DAMAGED POWER
TRANSISTORS.
YES
YES
YES
NO
NO
NO
ARE GPD 503 PHASES
SHORTED TO GROUND?
T1 (U), T2 (V), T3 (W)
TO G (E).
CHECK POWER TRANSISTORS
(SEE APPENDIX 4).
ARE TRANSISTORS
DAMAGED?
GPD 503
IS FAULTY.
7-6