KEB COMBIVERT F5 Operation Manual page 106

Drive Faults
Error/Message Alt.
(NUM)
Speed Follow-
ing Error (152)
106
/ Description
-
Cause/Solution/Troubleshoot
The encoder speed deviates from the command speed
by more than the amount set in LX14 Speed Difference
for more than 1 second (fixed). The Speed Following Er-
ror can be ignored as a drive fault by setting LX13 Speed
Following Error = Warning - Digital Output (if any of the
outputs LO05, 10, 15, or 20 are set for At Speed, the
controller may still generate a fault).
Possible causes of a speed following error include:
Lack of control
Maximum Torque limit or peak inverter current
reached.
Monitor the motor current to see if it reaches a
current corresponding to the LC30 Maximum
Torque or the drive Peak Current rating.
Maximum Torque may be set too low (default =
150%; Typical for high speed/full load operation
= 200-250%)
Excessive current
Incorrect motor data, specifically the motor
rated speed and frequency relationship (Di-
agnostic Screen #12) for PM Synchronous
Motors (see Section 4.5.2, LM02 or LM04 for
details).
Incorrect Encoder Pole Position for PM Syn-
chronous Motors. Relearn Encoder Pole
Position as needed (refer to Section 4.10.1 or
4.10.2).
...continued on next page.