Mitsubishi Electric MELDAS MDS-B-SVJ2 Series - Page 120

Chapter 5 Adjustment
5-12
(2) Notch filter 2
The frequency can be set separately from the notch filter 1. Note that low frequencies cannot be
set and the depth cannot be compensated.
No. Abbrev. Parameter name Explanation
SV033 SSF2 Servo function selection 2 The notch filter 2 sets the operation frequency with the following parameters.
F E D C B A 9 8 7 6 5 4 3 2 1 0
afs fhz2 nfd
bit No notch filter 2250Hz 1125Hz 750Hz
4 0 1 0 1
5
fhz2
0 0 1 1
(3) Jitter compensation
The load inertia becomes extremely small if the motor position enters the machine backlash when
the motor is stopped. Because this means that an extremely large VGN1 is set for the load inertia,
vibration may occur.
Jitter compensation is the suppression of vibration occurring when the motor stops by ignoring the
backlash amount of speed feedback pulses when the speed feedback polarity changes.
Increase the number of ignored pulses by one pulse at a time, and set a value at which the
vibration can be suppressed. (Because the position feedback is controlled normally, there is no
worry of positional deviation.)
When an axis that does not vibrate is set, vibration could be induced, so take care.
No. Abbrev. Parameter name Explanation
SV027 SSF1 Servo function selection 1 Set the jitter compensation with the following parameter.
F E D C B A 9 8 7 6 5 4 3 2 1 0
aflt zrn2
ovs lmc vfct
bit
No jitter
compensation
One pulse
compensation
Two pulse
compensation
Three pulse
compensation
4 0 1 0 1
5
vfct
0 0 1 1
POINT
Jitter compensation vibration suppression is only effective when the motor is
stopped.