RUN EXCITE-2008: Service & Maintenance Manual - rev. 1.3
Page 6.32
6.13. TREAD BELT MOTOR IS JERKING
The probable cause is a disconnected phase either at the ALE/AT UL driver board output or on the
motor;
TREAD BELT
MOTOR IS
JERKING
Are the tread belt motor
windings resistance correct?
NO
1
YES
Replace the tread belt
motor
Replace the AT driver
Check if the encoder works
properly by carry ing out the
troubleshooting procedure
"The encoder does not
work properly"
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
(1) Check parameter P409 as detailed at paragraph 9.4.6.2 “Config. registers”.
(2) Disconnect the cable from the motor and place a tester across its terminals U-V, U-W and V-
W. The measured value of the resistance should be 1.9 Ohm.
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