Section 6: PI controller
Table 6.1. Control and information parameters of the PI controller
Parameter
Name
Description
0.30
PI
reference
The value of the currently selected PI controller
referencing-unit [%]. Read-only.
0.31
PI input
The value of the currently selected PI feedback signal
input [%]. Read-only.
0.32
PI error
The value of the current controller error. Par. 0.32 [%] =
par. 0.30 - par. 0.31. Read-only.
0.33
PI output
The current value of the PI controller output [%]. Read-
only
2.60
The choice
of PI ref.-
unit
The referencing-unit source for the PI controller is used to
set the process reference value. Possible values:
0 - KBD:
PI referencing-unit from the control panel
1- Ref.-unit A1
2- Ref.-unit A2
3:
not used
4-RS:
reference via 485 interface (Modbus)
2.61
The choice
of PI input
The source of the PI controller feedback signal
0: Ref.-unit A1
1: Ref.-unit A2
2.62
Error
negation
Error negation (difference between reference value and
feedback signal)
0: NO
1: YES
2.63
P
amplificatio
n (Kp)
Amplification of the proportional part of the PI controller.
The greater the amplification , the faster the controller will
react to a speed error. Range:
1 ... 3000%
2.64
Constant I
(Ki)
Time constant of the PI controller.
Range:
0.01 ... 320.00s
2.66
Max.Out.PI
Maximum value that the PI controller output can reach
(saturation limitation)
Range:
0.0 ... 3000.0 %
2.67
Min.Out.PI
The minimum value that the PI controller output can
reach (saturation limitation)
Range:
-3000.0 ... 0.0 %
2.68
PI reset
Resetting the PI output when the system is stopped:
0:
reset to STOP
1:
the controller is always active
TWERD Power Electronics
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