Toshiba TOSVERT VF-MB1 Instruction Manual page 182

f366 (D-gain adjustment parameter)
Previous deviation-current deviation
6
5) Adjusting feedback input
To use external feedback input (VIA, VIB, VIC), perform voltage/current-scaling adjustments (input point
setting) as required. Refer to section 6.6.2 for details.
If the feedback input data is too small, voltage-scaling adjustment data can also be used for gain adjustment.
Example of 0 - 10 Vdc voltage input
setting

(60Hz)

(0Hz)
0V

0%
This parameter adjusts the differential gain level during PID control. This gain increases the speed of
response to a rapid change in deviation (difference between the process value and the feedback value).
Note that setting the gain more than necessary may cause fluctuations in output frequency, and thus
operation to become unstable.
Feedback value
Assign an input terminal function 52 (PID integral/derivative) to an input terminal, when that input
terminal is ON, it is possible to calculate integral/derivative amounts always as 0 (zero).
Example of 0 - 10 Vdc voltage input
setting
13
(60Hz)
11
(0Hz)
10V

100%
VIA input value
High differential gain
0V 5V
10 12
0% 100%
VIB input value
F-62
Low differential gain
Example of 4 - 20 mAdc voltage input
setting
19
(60Hz)
17
4mA
(0Hz)
16
20%
VIC input value
E6581697
Time
20mA
18
100%