Parameter listing and descriptions
269
ACH550 User's Manual
4003
DERIVATION TIME
0…10 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 =
NOT
SEL
– Disables the error-derivative part of the PID controller
output.
0.1…10.0 = Derivation time (seconds).
4004
PID DERIV FILTER
0…10 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 =
NOT
SEL
– Disables the error-derivative filter.
0.1…10.0 = Filter time constant (seconds).
Code Description
Range
t
100%
Gain
Process error value
P 4003
D-part of the controller output
PID output
Error
t
0%
P 4001
Summary of Contents for ACH550-01
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