KEB COMBIVERT F5, Reference Manual, Page: 273 / 349

273
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Alt. /
(NUM)
Description Cause/Solution/Troubleshoot
Error Encoder1 EEnC1
(32)
Loss of
incremental
encoder channel
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
cannot be at the same level. Channel pair voltages can
be measured t
o confirm.
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)
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 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.