Sigma II User’s Manual Chapter 6: Servo Adjustment
6 - 9
Related Parameters
Switch
Parameters
Caution
1. Exercise caution when setting the notch frequencies. Do not set the notch frequencies close to the speed
loop’s response frequency. Notch filter frequency should be at least 4 times higher than the speed loop’s
response frequency. Setting the notch frequency too close to the response frequency may cause vibration
and damage the machine. The speed loop’s response frequency is the speed loop gain (Pn100) when the
inertia ratio (Pn103) is set to the correct value.
2. Change the notch filter frequency (Pn409 & Pn40B) only when the motor is stopped. Vibration may occur
if the notch filter frequency is changed while the motor is rotating, causing damage to the machine.
Parameter
No.
Digit
Place
Parameter Name Setting Description
Factory
Setting
Pn408
0
Notch filter selection 0 Disabled
0
1 Enabled
1
Fixed parameter
––
–
2
Second stage notch filter
selection
0 Disabled
0
1 Enabled
3
Fixed parameter
––
–
Parameter
No.
Name Unit Setting Range Factory Setting
Pn40A Notch filter Q value 0.01 50 to 400 70
Pn40B Second stage notch filter frequency Hz 50 to 2000 2000
Pn40C Second stage notch filter Q value 0.01 50 to 400 70
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