Trim Control - Allen-Bradley PowerFlex40 User Manual

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Trim Control

In Trim Control, the PID Output is added to the Speed Reference. In
Trim mode, the output of the PID loop bypasses the accel/decel ramp as
shown. Trim Control is used when A132 [PID Ref Sel] is set to option 5,
6, 7 or 8.
PID Ref
PID
+
Error
–
PID Fdbk
Example
• In a winder application, the PID Reference equals the Equilibrium
set point.
• The Dancer Pot signal provides PID Feedback to the drive.
Fluctuations in tension result in a PID Error value.
• The Master Speed Reference sets the wind/unwind speed.
• As tension increases or decreases during winding, the Speed
Reference is trimmed to compensate. Tension is maintained near the
Equilibrium set point.
PID Reference =
Equilibrium Set Point
PID Loop
PID Prop Gain
+
PID Integ Time
PID Diff Rate
0 Volts
PID Feedback =
Dancer Pot Signal
10 Volts
P038 [Speed Reference]
PowerFlex 40 Adjustable Frequency AC Drive FRN 1.xx - 7.xx User Manual
Industry Automation
PID Set Up
P038 [Speed Reference]
Accel/Decel
PID
+
Output
+
+
PID Enabled
+86-755-8660-6182
Publication 22B-UM001I-EN-E
F-3
Ramp
+
Output
Freq