KEB COMBIVERT F5 Reference Manual page 273

Error/Message Alt. /
(NUM)
Error Encoder1 EEnC1
(32)
*Additional information at end of section
Diagnostics and Troubleshooting
Description Cause/Solution/Troubleshoot
Loss of For an incremental encoder interface, the recognition
incremental of encoder channel breakage or defective track triggers
encoder channel a fault if the voltage between two signal pairs (A+/A-,
or differential B+/B-, N+/N-) is smaller than 2V. That is, a signal pair
voltages for the cannot be at the same level. Channel pair voltages can
signal pairs are be measured to confirm.
the same for TTL
encoders.
During a Pole Position Learn for a PM motor, the correct
direction was not detected indicating that either the
direction 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 all other troubleshooting steps fail, the encoder card
may be faulty. Replace the encoder card.
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
always be jumpered high/low.
If performing a Motor Learn in open-loop, the
incremental 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)
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.
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