Danfoss VLT AutomationDrive FC 301 Programming Manual page 105

Parameter Descriptions
7-06 Speed PID Lowpass Filter Time
Range: Function:
signal that varies by a frequency of less than
1.6 Hz. If the feedback signal varies by a higher
frequency than 1.6 Hz, the PID regulator does
not react.
Practical settings of 7-06 Speed PID Lowpass
Filter Time taken from the number of pulses per
revolutions from encoder:
Encoder PPR
512
1024
2048
4096
NOTICE
Severe filtering can be detrimental to dynamic
performance.
This parameter is used with 1-00 Configuration Mode
[1] Speed closed loop and [2] Torque control.
Adjust the filter time in Flux Sensorless to
3-5 ms.
®
VLT AutomationDrive FC 301/302 Programming Guide
Feedback
7-06 Speed PID
Lowpass Filter Time
10 ms
5 ms
2 ms
1 ms
Feedback
Illustration 3.44 Feedback Signal
MG33MH02 - Rev. 2013-09-30
Disturbed feedback signal
Lowpass lter
f = 10 Hz
g
Filtered feedback signal
3
0.6 t (Sec.)
0.6 t (Sec.)
103
3