Actual signals and parameters
190
2302
INTEGRATION TIME
Defines an integration time for the speed controller. The integration time
defines the rate at which the controller output changes when the error value
is constant. The shorter the integration time, the faster the continuous error
value is corrected. Too short an integration time makes the control unstable.
The figure below shows the speed controller output after an error step when
the error remains constant.
Note:
For automatic setting of the integration time, use autotune run
AUTOTUNE RUN).
2.5
0.00…600.00 s
Time
1 = 0.01 s
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
0.…10000 ms
Time
1 = 1 ms
Parameters – complete descriptions
Index Name/Selection
Description
Def, FbEq
T
I
Controller output
t
%
Gain = K
p
= 1
T
I
= Integration time > 0
T
D
= Derivation time = 0
K
p
· e
e = Error value
K
p
· e
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
T
I
K
p
· e
Controller output
t
%
e = Error value
K
p
·
T
D
·
Δ
e
T
s
K
p
· e
Error value
Summary of Contents for ACS350 Series
Page 1: ...ACS350 User s Manual ACS350 Drives 0 37 22 kW 0 5 30 HP ...
Page 4: ......
Page 8: ...Safety 8 ...
Page 18: ...Table of contents 18 ...
Page 24: ...Hardware description 24 ...
Page 44: ...Installation checklist 44 ...
Page 56: ...Start up control with I O and ID Run 56 ...
Page 140: ...Program features 140 ...
Page 242: ...Actual signals and parameters 242 ...
Page 266: ...Fieldbus control with embedded fieldbus 266 ...
Page 284: ...Fault tracing 284 ...
Page 288: ...Maintenance and hardware diagnostics 288 ...
Page 309: ...Dimensions 309 Frame size R2 IP20 NEMA 1 3AFE68586658 A Frame size R2 IP20 NEMA 1 VAR EMC ...
Page 311: ...Dimensions 311 Frame size R3 IP20 NEMA 1 3AFE68579872 B Frame size R3 IP20 NEMA 1 VAR EMC ...
Page 313: ......