Toshiba TOSVERT VF-FS1 Instruction Manual page 140

5) Adjusting analog command voltages
6 To use external analog setting (VIA or VIB) or feedback input (VIA or VIB), perform voltage-scaling
adjustments (input point setting) as required. ⇒ See section 6.5.2 for further details.
If the feedback input data is too small, voltage-scaling adjustment data can also be used for gain adjustment.
Example of VIB terminal setting
(60Hz)
(0Hz)
0V
0%
6) Setting the time elapsed before PID control starts
You can specify a waiting time for PID control to prevent the inverter from starting PID control before the
control system becomes stable, for example, after start-up.
The inverter ignores feedback input signals, carries out operation at the frequency determined by the amount
of processing for the period of time specified with
the specified time.
(D-gain adjustment parameter)
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 frequency setting and the amount of
feedback).
Note that setting the gain more than necessary may cause great fluctuations in output frequency, and
thus operation to become unstable.
Example of VIA terminal setting
(voltage input)
(60Hz)
(0Hz)
10V
100%
VIB input value
0V 10V
0% 100%
VIA input value
and enters the PID control mode after a lapse of
F-44
Example of VIA terminal setting
(current input)
(60Hz)
4mA
(0Hz)
20%
VIA input value
E6581381
20mA
100%