ABB ACH550-01 User Manual page 281

ACH550 User's Manual
Code Description
4003 DERIVATION TIME
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
0.0 =
NOT SEL
output.
0.1...10.0 = Derivation time (seconds).
PID output
4004 PID DERIV FILTER
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 =
NOT SEL
0.1...10.0 = Filter time constant (seconds).
Parameter listing and descriptions
– Disables the error-derivative part of the PID controller
Error
100%
0%
D-part of the controller output
Gain
P 4001
P 4003
– Disables the error-derivative filter.
Range
0...10 s
PID DERIV FILTER
Process error value
t
t
0...10 s
.
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