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Actual signals and parameters 237
4003 DERIVATION
TIME
Defines the derivation time for the process PID controller.
Derivative action boosts the controller output if the error
value changes. The longer the derivation time, the more the
speed controller output is boosted during the change. If the
derivation time is set to zero, the controller works as a PI
controller, otherwise as a PID controller.
The derivation makes the control more responsive for
disturbances.
The derivative is filtered with a 1-pole filter. Filter time
constant is defined by parameter
0.0 s
0.0…10.0 s
Derivation time. If parameter value is set to zero, the
derivative part of the PID controller is disabled.
1 = 0.1 s
4004 PID DERIV
FILTER
Defines the filter time constant for the derivative part of the
process PID controller. Increasing the filter time smooths
the derivative and reduces noise.
1.0 s
0.0…10.0 s
Filter time constant. If parameter value is set to zero, the
derivative filter is disabled.
1 = 0.1 s
4005 ERROR
VALUE INV
Selects the relationship between the feedback signal and
drive speed.
NO
Normal: A decrease in feedback signal increases drive
speed. Error = Reference - Feedback
0
YES
Inverted: A decrease in feedback signal decreases drive
speed. Error = Feedback - Reference
1
4006 UNITS
Selects the unit for PID controller actual values.
%
0…128
See parameter
selections.
4007 UNIT SCALE
Defines the decimal point location for PID controller actual
values.
1
All parameters
No.
Name/Value
Description
Def/FbEq
t
t
100%
0%
Error
Process error value
D-part of controller output
PID output
Gain
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