Parameter descriptions
446 Derivative time (D)
If the control behavior of the PI controller (or P controller) is too slow, a faster control can be
achieved by activating and adjusting the differential part (
Derivative time 446). However, if the dif-
ferential part is activated, the control circuit has a higher tendency toward vibration. For this reason,
the differential part should be activated and changed carefully.
By default, the differential part is set to
Derivative time 446 = 0 ms, i.e. it is deactivated. High values
for
Derivative time 446 cause fast control, but amplify interferences.
The amplification (P) is included in the calculation of the derivative time (D), see figure PID controller.
446 Derivative time 0 ms 1000 ms 0 ms
442 Maximum Frequency
443 Minimum Frequency
Parameters Maximum Frequency 442 and Minimum Frequency 443 define the working range of the
controller. In this way, you can also define if the PID controller is to operate the drive in one direction
only or if both directions of rotations are to be possible.
442 Maximum Frequency 0 Hz 999.99 Hz 50.00 Hz
443 Minimum Frequency -999.99 Hz 0 Hz -50.00 Hz
If the PID controller is to operate the drive in both directions, (Minimum Frequen-
cy
443< 0 Hz), Parameter Minimum Frequency 418 should be set to 0 Hz.
If Maximum Frequency 442 and Minimum Frequency 443 are set asymmetric (in
example
Maximum Frequency 442 = 30.00 Hz and Minimum Frequency 443 =
Amplification 444), setting the Start-Right-Control will resu
Maximum Frequency 442
for Clockwise rotation (positive control deviation) and
Minimum Frequency
443 for Anticlockwise rotation (negative control deviation).
-Left-Control will result in using Minimum Frequency 443 for Clock-
rotation (positive control deviation) and Maximum Frequency 442 for Anticlock-
wise rotation (negative control deviation).
618 Backlash
With parameter
Backlash 618, you can set a range in which a control deviation is not processed. In
this way, frequent post-controlling and jerking of the drive can be avoided.
Requirement:
Stator Frequency 210 < Switch-Off Threshold Stop Function 637.
No. Description Min. Max. Fact. sett.
618 Backlash 0% 30.00% 0%
616 Backlash Motor Power off
In different applications it could be requested to switch off the power stage with a small control devia-
tion and low output frequency. With parameter
Backlash Motor Power off 616 this behavior can be
set up.
226
Operating Instructions
Agile
06/2013 Control functions
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