Toshiba TOSVERT VF-AS1 Instruction Manual page 153

 Differential (D) gain
The differential (D) gain set with f366 is the differential (D) gain obtained by PID control.
The differential gain increases the speed of response to rapid changes in deviation. If this gain is set excessively
high, a phenomenon in which the output frequency greatly fluctuates may occur.
Previous deviation-current deviation
Feedback value
If one of input terminals is assigned input terminal function 52/53 (PID differentiation/integration reset), differential
and integral values are always 0 (zero) during the input terminal on.
5) Adjusting the analog command voltage and current
For items which can be adjusted by reference and feedback input, such as voltage/current input (VI/II input),voltage
input (RR/S4 input) and voltage input (RX input), adjust scaling factor of the voltage/current if necessary.
When feedback signals are very low, the gain can be increased by this adjustment.
When VI/II used as a voltage input terminal
(Default setting)
aif2
(80Hz)
f202
(0Hz) 2V
f201
20%
When RR/S4 used as a voltage input terminal
(Default setting)
avf2
(80Hz)
f211
(0Hz) 0V
f210
0%
High differential gain
When VI/II used as a current input terminal
(f108 needs to be set to 1)
aif2
(80Hz)
f202
10V (0Hz)
f203
100%
When RX used as a voltage input terminal
(Default setting)
f219
(80Hz)
f217
10V (0Hz) 0V
f212 f216
100% 0%
F-37
Low differential gain
4mA
f201
20% 100%
E6581445
Time
6
20mA
f203
10V
f218
100%