Toshiba VF-FS1 - Manual (Page 140)

E6581381
F-44
6
H (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.
5) Adjusting analog command voltages
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 Example of VIA terminal setting
(voltage input) Example of VIA terminal setting
(current input)
H
(60Hz)
H
(0Hz)
0V
H
0% 10V
H
100%
VIB input value
O
ut
p
ut
f
requ
enc
y
H
(60Hz)
H
(0Hz)
0V
H
0% 10V
H
100%
VIA input value
O
ut
p
ut
f
requ
enc
y
H
(60Hz)
H
(0Hz)
4mA
H
20%
20mA
H
100%
VIA input value
O
ut
p
ut
f
requ
enc
y
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 H and enters the PID control mode after a lapse of
the specified time.