BLOWN FUSE ( PUF ) FAULT INDICATION
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 DRIVE PHASES
SHORTED TO GROUND?
T1 (U), T2 (V), T3 (W) TO
GROUND TERMINAL ( ).
CHECK POWER TRANSISTORS
(SEE APPENDIX 4).
ARE TRANSISTORS
DAMAGED?
DRIVE
IS FAULTY.
6-10
TROUBLESHOOTING CHART 6.4
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