Toshiba VF-PS1 Instruction Manual page 146

 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
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)
6
aif2 aif2
(80Hz) (80Hz)
f202
(0Hz) 2V 10V
When RR/S4 used as a voltage input terminal
(Default setting)
avf2 f219
(80Hz) (80Hz)
f211 f217
(0Hz) 0V
Feedback value
f201 f203 f201 f203
20% 100% 20% 100%
f210 f212 f216 f218
0% 100% 0% 100%
High differential gain
Low differential gain
When VI/II used as a current input terminal
(f108 needs to be set to 1)
f202
(0Hz) 4mA 20mA
When RX used as a voltage input terminal
(Default setting)
10V (0Hz) 0V
F-34
E6581386
Time
10V