KEB COMBIVERT F5 Reference Manual page 288

Diagnostics and Troubleshooting
Error/Message Alt. /
(NUM)
Speed -
Following Error (152)
288
*Additional information at end of section
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
Error 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:
...continued on next page.
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
(Diagnostic Screen #12) for PM Synchronous
Motors (see Section 5.5.2, LM02 or LM04 for
details).
Incorrect Encoder Pole Position for PM
Synchronous Motors. Relearn Encoder Pole
Position as needed (refer to Section 5.10.1 or
5.10.2).