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7-05 Speed PID Diff Gain Limit
Range:
Function:
5.000
*
[1.0 - 20.0]
Set a limit for the gain provided by the differentiator. Since the differential gain increases at higher frequencies,
limiting the gain may be useful. For example, set up a pure D-link at low frequencies and a constant D-link at
higher frequencies. This parameter is used with par. 1-00
Speed closed loop
[1] control.
7-06 Speed PID Lowpass Filter Time
Range:
Function:
10.0 ms
*
[1.0 - 100.0 ms]
Set a time constant for the speed control low-pass filter. The low-pass filter improves steady-state performance
and dampens oscillations on the feedback signal. This is an advantage if there is a great amount on noise in the
system, see illustration below. For example, if a time constant (
τ
) of 100 ms is programmed, the cut-off frequency
for the low-pass filter will be 1/0.1= 10 RAD/sec., corresponding to (10/2 x p) = 1.6 Hz. The PID regulator only
regulates a feedback 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 Par. 7-06 taken from the number of pulses per revolutions from encoder:
Encoder PPR
Par. 7-06
512
10 ms
1024
5 ms
2048
2 ms
4096
1 ms
Note that severe filtering can be detrimental to dynamic performance.
This parameter is used with par. 1-00
Speed closed loop
[1] and
Torque
[2] control.
The filter time in flux sensorless must be adjusted to 3-5 ms.
7-08 Speed PID Feed Forward Factor
Range:
Function:
0%
*
[0 - 500%]
The reference signal bypasses the speed controller by the amount specified. This feature increases the dynamic
performance of the speed control loop.
2.10.3. 7-2* Process Ctrl. Feedb.
Select the feedback sources for the Process PID Control, and how this feedback should be handled.
7-20 Process CL Feedback 1 Source
Option:
Function:
The effective feedback signal is made up of the sum of up to two different input signals.
2. How to Programme
FC 300 Programming Guide
102
MG.33.M3.02 - VLT
®
is a registered Danfoss trademark
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