91
Drive Faults
Error/Message Alt. /
(NUM)
Description Cause/Solution/Troubleshoot
Error Encoder1 EEnC1
(32)
Loss of incremen-
tal encoder chan-
nel or differential
voltages for the
signal pairs are
the same for TTL
encoders.
For an incremental encoder interface, the recognition of
encoder channel breakage or defective track triggers a
fault if the voltage between two signal pairs (A+/A-, B+/B-
, N+/N-) is smaller than 2V. That is, a signal pair can-
not be at the same level. Channel pair voltages can be
measured to conrm.
If an incremental encoder does not have N+/N- (or
Z+/Z-) tracks, then the corresponding inputs on the
encoder interface card must be jumpered high/low.
That is, jumper X3A.5 (N+) to X3B.7 (+5V) and X3A.6
(N-) to X3A.8 or X3B.8 (0V Common). In any case,
the N+/N- are not needed and these inputs could al-
ways be jumpered high/low.
If performing a Motor Learn in open-loop, the incre-
mental encoder interface card could be removed if an
encoder is not connected.
Verify the encoder power ratings & connections
(e.g. Powering a 8-30VDC rated encoder with 5V)
During a Pole Position Learn for a PM motor, the correct
direction was not detected indicating that either the direc-
tion was incorrect due to the A/B channel phasing or that
movement did not occur either due to excessive friction,
brake not lifting, etc.
If the encoder A/B phasing is incorrect during the Pole
Position Learn for a PM motor, this can be changed in
LE03 Swap Encoder Channels. This is automatically
done during the Encoder Synchronization procedure.
During the Pole Position learn, the motor must be able
to move with little friction which may require either a
balanced car or unroped sheave. Additionally, verify
the brake is picking and fully released.
If all other troubleshooting steps fail, the encoder card
may be faulty. Replace the encoder card.
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