Parameter listing and descriptions
279
ACH550-01 User's Manual
4003
DERIVATION TIME
0.0…10.0 s
Defines the derivation time of the PID controller.
• You can add the derivative of the error to the PID controller output.
The derivative is the error value’s rate of change. For example, if the
process error value changes linearly, the derivative is a constant
added to the PID controller output.
• The error-derivative is filtered with a 1-pole filter. The time constant of
the filter is defined by parameter 4004
PID
DERIV
FILTER
.
0.0 – Disables the error-derivative part of the PID controller output.
0.1…10.0 – Derivation time (seconds).
4004
PID DERIV FILTER
0.0…10.0 s
Defines the filter time constant for the error-derivative part of the PID
controller output.
• Before being added to the PID controller output, the error-derivative is
filtered with a 1-pole filter.
• Increasing the filter time smooths the error-derivative, reducing noise.
0.0 – Disables the error-derivative filter.
0.1…10.0 – Filter time constant (seconds).
4005
ERROR VALUE INV
0=NO, 1=YES
Selects either a normal or inverted relationship between the feedback
signal and the drive speed.
0 =
NO
– Normal, a decrease in feedback signal increases drive speed.
Error = Ref - Fbk.
1 =
YES
– Inverted, a decrease in feedback signal decreases drive
speed. Error = Fbk - Ref.
Code Description
Range
100%
Gain
Process error value
P 4003
D-part of the controller output
PID output
Error
0%
P 4001
t
t
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