KEB COMBIVERT F5 Operation Manual page 107

Error/Message Alt.
(NUM)
Speed Follow- -
ing Error (152)
(continued)
Speed Selec- -
tion Error* (153)
Unintended -
Movement* (158)
/ Description
Speed command
input missing at
beginning of run.
After a normal
high speed run, if
the motor moves
by more than the
value set in LX25
then Unintended
Movement will oc-
cur and can only
be reset manually
by pressing F1
and F4 simulta-
neously on the
keypad.
Cause/Solution/Troubleshoot
Speed gains set too low.
If the speed following error occurs during accel-
eration 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.
For digital, binary and serial binary input speed selection
control modes, the Speed Selection Error is triggered if a
speed input is not given before the LT01, LT03 timers ex-
pire. These timers start after the drive enable and direc-
tion have been given. Not active on inspection run. Refer
to additional information at end of section.
Unintended Movement is not monitored from inspection
speed selection. For analog and serial speed control
modes, an input can be programmed to indicate inspec-
tion runs.
Refer to additional information at end of section.
Drive Faults
107