Actual signals and parameters
215
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
PID DERIV FILTER.
0
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
0.0…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
NO
Normal: A decrease in feedback signal increases drive speed. Error = Ref -
Fbk
0
YES
Inverted: A decrease in feedback signal decreases drive speed. Error = Fbk -
Ref
1
4006
UNITS
Selects the unit for PID controller actual values.
%
OUTPUT1 UNIT selections NO UNIT…Mrev.
0…63
4007
UNIT SCALE
Defines the decimal point location for the display parameter selected by
parameter
UNITS.
1
0…3
Example PI (3.14159)
1 = 1
Parameters – complete descriptions
Index Name/Selection
Description
Def, FbEq
t
100%
Gain
Process error value
4003
D-part of controller output
PID output
Error
t
0%
4001
4007 value
Entry
Display
0
0003
3
1
0031
3.1
2
0314
3.14
3
3142
3.142
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: ......