Fu2-47: Pid Operation Selection; Fu2-48: Pid F Gain; Fu2-49: Pid Reference Mode Selection; Fu-50: Pid Output Direction Selection - LG SV-iS5 Instruction Manual

Chapter 6 - Parameter Description [FU2]
☞
Note: The response time of a system is affected by the
load inertia. For better control performance, set the FU2-
37 [Load Inertia] correctly.
Related Functions:
FU2-30 ~ FU2-37 [Motor Parameters]
FU2-40 [Control Method]

FU2-47: PID Operation Selection

FU2?Proc PI mode
47 --- No ---
Factory Default:
No
This code selects the PID control.
For HVAC or Pump applications, the PID control can be
used to adjust the actual output by comparing a
feedback with a ' Set-point' given to the inverter. This
' Set-point' can be in the form of Speed, Temperature,
Pressure, Flow level, etc. The ' Set-point' and the
feedback signals are provided externally to the inverter
analog input terminals V1, V2 or I. The inverter
compares the signals in calculating ' total-error' which is
reflected in the inverter output.
Please see FU2-50 to FU2-54 for more detail.
☞
Note: PID control can be bypassed to manual operation
temporarily by defining one of the multifunction input
terminals (P1~P3) to "Open- loop". The inverter will
change to manual operation from PID control when this
terminal is ON, and change back to PID control when this
terminal is OFF.
Related Functions: DRV-04 [Frequency Mode]
I/O-01 to I/O-10 [Analog Signal Setting]
I/O-12 to I/O-14 [Multi-Function Input]
EXT-15 to EXT-21 [Pulse Input Setting]
FU2-50 to FU2-54 [PID Feedback]

FU2-48: PID F Gain

FU2-49: PID Reference Mode Selection

FU2-50: PID Output Direction Selection
FU2? PID F-Gain
48 0.0 %
Factory Default:
0.0%
This code sets F Gain value for use of Feed Forward
control.
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47 0
0
48 0.0
0.0
110
When it is set to 100%, the responsiveness (%) of output
F gain value from controller reference value is 100%.
Used when fast response is needed.
Caution) Control System output may become unstable if
this value is set too high.
FU2?Aux Ref Mode
49 None
Factory Default:
None
This code selects reference input for PID control.
FU2? PID Out Dir
50 Target Freq.
Factory Default:
Target Freq.
This code selects the direction of output value of PID
controller. The output value is added to Target frequency.
FU2-51: PID Feedback Signal Selection
FU2-52: P Gain for PID Control
FU2-53: I Time for PID Control
FU2-54: D Time for PID Control
FU2-55: High Limit Frequency for PID Control
FU2-56: Low Limit Frequency for PID Control
FU2? PID F/B
51 I
Factory Default:
I
Select the feedback signal for PID control. This can be
set one of ' I' (4-20mA), ' V1' , ' V2' according to the signal
(current or voltage) and the terminal (V1 (0-10V) or V2
(Sub-B board)). Refer to I/O 6-10 for I, I/O1-5 for V1 and
EXT -5-10 [V2 Analog Ref. Freq setting] for V2.
FU2? PID P-gain
52 1.0 %
Factory Default:
1.0 %
Set the proportional gain for PID control. When P-Gain is
set at 100% and I-Time at 0.0 second, it means the PID
controller output is 100% for 100% error value. P-Gain is
set to 50% and I- Time to 0.0 sec, PID controller output
becomes 50% for 100% error value.
FU2? PID I-time
53 10.0 sec
Factory Default:
10.0 sec
49 0
0
50 0
0
51 0
0
52 1.0
1.0
53 10.0
10.0