Toshiba VF-nC1 User Manual download pdf (Page 82)

E6581090

F-18

4) Adjusting the PI control gain level

Adjust the PI control gain level according to the process quantity, the feedback signal and the object

to be controlled.

The following parameters are provided for gain adjustment.

Parameter Adjustment range Default setting

H (P gain)

0.01～100.0

0.30

H (I gain)

0.01～100.0

0.20

H (Proportional (P) gain adjustment parameter)

This parameter is used to adjust the proportional gain level during PI control. A correction factor,

which is proportional to the particular deviation (the difference between the set frequency and the

feedback value), is obtained by multiplying this deviation by the parameter setting.

Increasing the P gain increases response. However, increasing it higher than required results in an

undesirable event such as hunting.

Slow response

Process quantity

setting

Time

Fast response

H (Integral (I) gain adjustment parameter)

This parameter is used to adjust the integral gain level during PI control. Any deviations remaining

after proportional control are cleared to zero (residual deviation offset function).

Increasing the I gain increases response. However, increasing it higher than required results in an

undesirable event such as hunting.

Residual deviation

Process quantity setting

Time

5) Adjusting an analog command voltage

To u s e f eedback input (VI/S3 terminal), perform a voltage-scaling adjustment as required. See

Section 6.4.1 for details.

If the feedback input value is very small, the voltage-scaling adjustment value can also be used for

gain adjustment.

Example of voltage signal setting Example of current signal setting

H

(80Hz)

H

(0Hz)

H

10V

H

100%

H

(80Hz)

H

(0Hz)

4mA

H

20%

20mA

H

100%

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Toshiba VF-nC1 User Manual Page 82

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