LG Electronics C Series manual PID Control

Chapter 10. Advanced functions

10.7 PID Control

Group

LED Display

Parameter Name

Set

Min/Max

Factory

Unit

value

Range

Defaults

Function

H40

[Control mode select]

2

0/3

0

-

group 2

H50

[PID Feedback select]

-

0/1

0

-

H51

[P gain for PID controller]

-

0/999.9

300.0

%

H52

[Integral time

for

PID

-

0.1/32.0

300

Sec

controller (I gain)]

H53

[Differential time for

PID

-

0.0/30.0

0

Sec

controller (D gain)]

H54

[F gain for PID controller]

0/999.9

0

%

H55

[PID output

frequency

-

0/400

60.0

Hz

limit]

I20~24

[Multi-function

input

21

0/24

-

-

terminal P1-P5 define]

ƒSet H40 to 2 {PID Feedback control}.

ƒOutput frequency of the inverter is controlled by PID control for use as constant control of flow, pressure or temperature.

H50: Select the feedback type of PID controller.

H50

[PID feedback

select]

0{Terminal I input (0 ~ 20 mA)}

1{Terminal V1 input (0 ~ 10 V)}

H51: Set the percentage of output to error. If P Gain is set to 50%, 50% of the error value will be output.

H52: Set the time needed to output the accumulated error value. Set the time required to output 100% when the error value is 100%. If H52 - [Integral time for PID controller (I gain)] is set to 1 sec, 100% is output in 1 sec.

H53: Set the output value corresponding to the variation of the error. The error is detected by 0.01 sec in C series. If differential time is set to 0.01 sec and the percentage variation of error is 100 per 1 sec, 1% in 100% is output per 10msec. H54: PID Feed Forward Gain. Set the gain to add the target value to the PID controller output.

H55: It limits the output of the PID controller.

I20~I24: To exchange PID, set one of P1-P5 terminal to 21 and turn ON.

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