Toshiba VF-nC1 Performing PI control, External connection, Types of PI control interfaces

Models: VF-nC1

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E6581090

6.11Performing PI control

H : PI control

H : Proportional (P) gain

H : Integral (I) gain

Function

These parameters are used to perform various kinds of process control, such as keeping the air quantity, flow rate or pressure constant by inputting feedback signals (4~20mA, 0~10V) from a detector.

[Parameter setting]

Title

Function

Adjustment range

Default setting

H

PI control

0: Disabled, 1: Enabled

0

H

Proportional (P) gain

0.01100.0

0.30

H

Integral (I) gain

0.01100.0

0.20

1) External connection

R/L1

U/T1

 

S/L2

V/T2

M

T/L3

W/T3

 

Preset speed

S1

P

setting

S2

Potentiometer setting

 

 

 

 

Panel input setting

 

VI/S3

 

 

CC

 

6

Pressure

gauge

Feedback signal: 4~20mA, 0~10V

2) Types of PI control interfaces

The following combinations of process quantity data (frequency setting) and feedback data can be entered for PI control.

Process quantity input data (frequency setting)

Feedback input data

Setting mode

Frequency setting mode

External analog input

 

HOQF

H: 0 (voltage input)

Internal potentiometer setting



VI/S3 (DC: 0~10V)

Panel input setting



H:1 (current input)

Preset speed setting

 or 

VI/S3 (DC: 4~20mA)

Note: When the PI control function is enabled (H: 1), the VI/S3 terminal is used exclusively as a feedback signal input terminal.

Note: Do not set Frequency setting mode (HOQF) parameter to 0 if VI/S3 terminal is not used as contact input.

If all terminals for preset speed are off, a speed command other than the preset speed

3) Setting the PI control parameter

Set the extended parameter H (PI control) to  (enabled).

(1)It is recommended to set the parameters CEE (acceleration time) and FGE (deceleration time) to as small values as possible.

(2)If there is a need to limit the output frequency, set it with the parameters WN (upper limit frequency) and NN (lower limit frequency). When process quantities are set from the operation panel, their adjustment ranges are limited by the settings of WN (upper limit frequency) and NN (lower limit frequency).

F-17

Page 81
Image 81
Toshiba VF-nC1 instruction manual Performing PI control, External connection, Types of PI control interfaces