KEB COMBIVERT F5 Reference Manual page 289

Error/Message Alt. /
(NUM)
Speed -
Following Error (152)
(continued)
Speed -
Selection Error* (153)
Unintended -
Movement* (158)
*Additional information at end of section
Diagnostics and Troubleshooting
Description Cause/Solution/Troubleshoot
Speed command For digital, binary and serial binary input speed selection
input missing at control modes, the Speed Selection Error is triggered if
beginning of run. a speed input is not given before the LT01, LT03 timers
expire. These timers start after the drive enable and
direction have been given. Not active on inspection run.
Refer to additional information at end of section.
After a normal Unintended Movement is not monitored from inspection
high speed run, if speed selection. For analog and serial speed control
the motor moves modes, an input can be programmed to indicate
by more than the inspection runs.
value set in LX25
then Unintended Refer to additional information at end of section.
Movement will
occur and can
only be reset
manually by
pressing F1 and
F4 simultaneously
on the keypad.
Speed gains set too low.
If the speed following error occurs during
acceleration or deceleration, the speed tracking
may lag if the speed control gains are too low.
Increase corresponding proportional speed
gain for acceleration or deceleration.
Learn system inertia.
If the speed following error occurs at takeoff,
there may be high break away friction.
Increase LC11 KI Speed Offset Acceleration.
Mechanical Issues/High Friction.
Modulation grade exceeds maximum.
If the modulation grade in Diagnostic Screen #2
or DG10 exceeds 100% there may be a loss of
speed control. This may also prevent the motor
from reaching the command speed.
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