Parker AC890PX Series, Engineering Reference

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A p p e n d i x D : P r o g r a m m i n g
D-145
AC890PX AC Drive
Parameter Descriptions
SPEED DMD FILTER
PREF: 78.05 Default: 0.0 ms Range: 0.0 to 14.0 ms
The speed demand is filtered to reduce ripple. The filter is first order with time constant equal to the value of this parameter.
SPEED FBK FILTER PREF: 78.06 Default: 0.0 ms Range: 0.0 to 15.0 ms
The speed feedback is filtered to reduce ripple, such as that caused by low line count encoders. The filter is first order with time constant equal to
the value of this parameter.
AUX TORQUE DMD
PREF: 78.07 Default: 0.00 % Range: -300.00 to 300.00 %
When the drive is operating in speed control mode, the value of this parameter is added on to the torque demand produced by the speed loop PI.
When the drive is operating in torque control mode (i.e. “torque demand isolate is TRUE) the speed loop PI does not operate, and the torque
demand becomes the sum of this parameter plus the DIRECT INPUT (if selected).
ADAPTIVE THRESH PREF: 78.08 Default: 5.00 % Range: 0.00 to 10.00 %
If the speed demand is less than the adaptive threshold, the speed loop proportional gain is the adaptive p-gain.
ADAPTIVE P-GAIN PREF: 78.09 Default: 20.00 Range: 0.00 to 300.00
Proportional gain used if speed demand < adaptive threshold.