Default: 0
Range: -32768 to 32767
Note: Use positive Feed Forward and Gain values if the pressure increases in the extend direction, and negative values if the pressure increases in the retract direction.
The Differential Gain field is used to minimize the error between the Target Pressure and the Actual Pressure. The change in error is multiplied by the Differential Gain value to get the differentiator drive term. Differential Gain is defined as:
Differential Gain = 0.1 millivolts per change in Pressure Error
Differential Drive is defined as:
Differential Drive = (E0 - E1) x Differential Gain
where E0 is the pressure error (Target Pressure - Actual Pressure) in the first time period and E1 is the pressure error in the second time period. (E0 - E1) is the change in pressure error between the two time periods.
CAUTION: To avoid oscillation during initial tuning, start with values below 10.
Why Bother?
The differentiator field should usually be set to a value of 0. This is because analog input signal noise causes the speed calculations to be noisy.
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