Toshiba VF-FS1  D-gain adjustment parameter, Adjusting analog command voltages

E6581381

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.

6	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)
Output frequency	H
	(0Hz)

0V	10V
H	H
0%	100%
	VIB input value

Output frequency

H (60Hz)

H
(0Hz)
0V	10V
H	H
0%	100%
	VIA input value

H (60Hz)

Output frequency

H
(0Hz) 4mA	20mA
H	H
20%	100%
	VIA input value

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.

F-44