Troubleshooting Guide 4 - YASKAWA USAREM-A5A Bulletin

12. TROUBLESHOOTING GUIDE
12. 1 A C SERVOMOTOR
Trouble
Motor does n o t
start
Unstable operation
Motor overheats
Unusual noise
Corrective actions in s h o u l d be performed
after turning O F F t h e p o w e r
Ta b l e 1 2 . 1 T r o u b l e s o o t i n g G u i d e for A C S E R V O M O T O R
Cause
Loose connection
Wrong wiring
Overload
Motor defective
. . . M A V I A , M e a M M I I K b
Wrong wiring
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Excessive ambient
temperature
Motor dirty
Overload
Motor loosely mounted
Motor misaligned
Coupling o u t of balance
Noisy bearings
Vibration o f driven machine
WARNING
Tighten connection
Correct wiring
Reduce load o r use a larger motor
Measure voltage across motor terminals U, V, and W
with a tester W h e n correct, replace motor
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nspect and correct wiring across motor terming s U
V, and W, and PG
Reduce below 40 °C
Clean motor surface
Reduce load o r use a larger motor
Tighten foundation bolts
Realign w i t h driven machine
Balance coupling
Check alignment, loading of bearing, lubrication and
contact Yaskawa representative
Contact the machine manufacturer
Corrective Action
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