PowerFlex Digital DC Drive User Manual - Publication 20P-UM001C-EN-P - July 2008
3-36 Programming and Parameters
APPLICATIONS
PD Control
421 [PD Output PID]
Proportional / Derivative (PD) block output.
Default:
Min/Max:
Read Only
–/+10000
766 [PD Deriv Gain 1]
First derivative gain of the PD block. The value specified in this field
depends on the enabling and configuration of Par 181 [Adaptive Spd
En].
Default:
Min/Max:
1.00
0.00 / 100.00
181
767 [PD Deriv Filter]
Time constant of the filter from the derivative portion of the PD block.
Default:
Min/Max:
Units:
0
1 / 1000
ms
768 [PD Prop Gain 1]
First proportional gain of the block PD. The value specified in this field
depends on the enabling and configuration of Par 181 [Adaptive Spd
En].
Default:
Min/Max:
10.00
0.00 / 100.00
181
770 [Enable PD]
Enables/disables the PD portion of the PID regulator.
Note: This parameter can be assigned to a digital input.
Default:
Options:
0 =
0 =
1 =
“Disabled”
“Disabled”
“Enabled”
788 [PD Prop Gain 2]
Second proportional gain of the block PD. The value specified in this
field depends on the enabling and configuration of Par 181 [Adaptive
Spd En].
Default:
Min/Max:
10.0
0.0 / 100.0
181
789 [PD Deriv Gain 2]
Second derivative gain of the PD block. The value specified in this
field depends on the enabling and configuration of Par 181 [Adaptive
Spd En].
Default:
Min/Max:
10.0
0.0 / 100.0
181
790 [PD Prop Gain 3]
Third proportional gain of the block PD. The value specified in this
field depends on the enabling and configuration of Par 181 [Adaptive
Spd En].
Default:
Min/Max:
10.0
0.0 / 100.0
181
791 [PD Deriv Gain 3]
Third derivative gain of the PD block. The value specified in this field
depends on the enabling and configuration of Par 181 [Adaptive Spd
En].
Default:
Min/Max:
1.00
0.00 / 100.00
181
PID Control
418 [Real FF PID]
Represents the feed–forward value which has been recalculated
according to the PI correction. It will be calculated with the following
formula:
Par 418 [Real FF PID] = (Par 758 [Feed Fwd PID] / 1000 ) x Par 771
[PI Output]
When either the negative or positive limit of this parameter has been
reached, further increases in the value of Par 771 [PI Output] will be
blocked in order to avoid undesirable saturation of the PID regulator.
For example:
When Par 758 [Feed Fwd PID] = +8000, the positive limit of Par 771
[PI Output] will be automatically set at 10000 / ( 8000 / 1000 ) = 1250.
Default:
Min/Max:
Read Only
–/+10000
758,
771
731 [PID Steady Delay]
The amount of time for which the gains in Pars 793 [PI Init Prop Gn]
and 734 [PI Init Intgl Gn] will remain enabled after feed–forward has
exceeded the threshold value defined in Par 695 [PI Steady Thrsh].
Default:
Min/Max:
Units:
0
0 / 60000
ms
695,
734,
793
734 [PI Init Intgl Gn]
The initial value of the integral gain. This parameter is active when
feed–forward is greater than the value defined in Par 695 [PI Steady
Thrsh], or Par 769 [Enable PI] transitions from “0” (low) to “1” (high)
and the amount of time defined in Par 731 [PID Steady Delay] has
elapsed.
Default:
Min/Max:
10.00
0.00 / 100.00
695,
731,
769
File
Group
No.
Parameter Name & Description
See page 3-2 for symbol descriptions
Values
Related
A
A
A
A
A
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A
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