Mitsubishi FREQROL-SFJ Maintenance Manual page 117

Ac spindle drive
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Cause
Hunting occurs at Decrease parameter 1x1 and
stop.
Servo stiffiness
(stability) poor
Overshoot in
speed control
Checkup
settings to check.
PG2
Check gear ratio settings.
_
Remedy
Parameter #22
PG2
E
l
Parameter #21
Set these para-
meters properly.
Increase speed
control loop con-
stant.
o
r
Decrease speed
control loop con-
stant.

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