LG C Series - Manual (Page 87)

Chapter 10. Advanced functions
10.7 PID Control
Group LED Display Parameter Name
Set
value
Min/Max
Range
Factory
Defaults
Unit
H40 [Control mode select] 2 0/3 0 -
H50
[PID Feedback select]
- 0/1 0 -
H51
[P gain for PID controller]
- 0/999.9 300.0 %
H52
[Integral time for PID
controller (I gain)]
- 0.1/32.0 300 Sec
H53
[Differential time for PID
controller (D gain)]
- 0.0/30.0 0 Sec
H54
[F gain for PID controller]
0/999.9 0 %
H55
[PID output frequency
limit]
- 0/400 60.0 Hz
Function
group 2
I20~24
[Multi-function input
terminal P1-P5 define]
21 0/24 - -
ƒ Set H40 to 2 {PID Feedback control}.
ƒ Output 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.
0
{Terminal I input (0 ~ 20 mA)} H50 [PID feedback
select]
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.
87