Parameter listing and descriptions
233
ACH550-01 User's Manual
2303
DERIVATION TIME
0…10000 ms
Sets the derivation time for the speed controller.
• Derivative action makes the control more responsive to 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 figure below shows the speed controller output after an error step
when the error remains constant.
Code Description
Range
T
I
K
p
·
e
Error value
Controller output
%
e = Error value
K
p
·
T
D
·
Δ
e
T
s
K
p
·
e
K
p
= Gain = 1
T
I
= Integration time > 0
T
D
= Derivation time > 0
T
s
= Sample time period = 2 ms
Δ
e = Error value change between two samples
t
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