Toshiba G3 Workbook page 53

Also known as anti-hunting gain or rate, differential gain is really not a gain, but a time. Differential gain
is seldom used, but it helps to stop oscillations on slowly changing variables (temperature). Any high
frequency changes in the system variable (including noise, if present) are picked up by the differential
circuit and could lead to instability. The longer the derivative time, the stronger the derivative action.
40
Hz
30
40
Hz
30
For additional assistance, please contact Toshiba Ad
DIFFERENTIAL GAIN
Input to Differential Circuit
Output from Differential Circuit
Derivative
Time
PID Drive Output Hz vs. Time
(in response to pressure drop)
justable Speed Drive Marketing Dept. at (800) 872-
2192
Desired Response
Time
Improve by decreasing
Integral Time
53