238 Actual signals and parameters
2303 DERIVATION
TIME
Defines the derivation time for the speed 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 figure below shows the speed controller output after an
error step when the error remains constant.
0 ms
0.…10000 ms
Time
1 = 1 ms
All parameters
No.
Name/Value
Description
Def/FbEq
Gain = K
p
= 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
e = Error value
Controller
output
K
p
· e
%
t
K
p
· e
T
I
Error value
K
p
·
T
D
·
Δ
e
T
s
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...