Drive Faults - KEB COMBIVERT F5 Applications Manual

8. Drive Faults

Faults and error codes are listed alphabetically. Additional troubleshooting of Operational Problems are
listed in Section 9. The last drive fault can be found in CP36. Fault history can be viewed in the Fault Log
Screen, accessible through the Menu. After 50 errors the fault log will be written down to the memory of
the keypad. These les can be retrieved with an SD card.
Error/Message Alt.
(NUM)
Error Encoder1 EEnC1
(32)
Error Low Ebr
Motor Current (56)
/ Description
Loss of
incremental
encoder channel
or differential pair
are the same for
TTL encoders.
Closed loop only
Low current
during initial
current check
Cause/Solution/Troubleshoot
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 to con rm.
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 (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)
Possible causes for low motor current error during
current check:
One or more motor leads not connected
Motor contactor not closing (in time)
Motor contactor contacts are damaged
Motor windings are damaged
Check:
Check/replace/bypass motor contactor
Measure motor resistance
11