PowerFlex Digital DC Drive User Manual - Publication 20P-UM001C-EN-P - July 2008
C-4 Application Notes
Current / Speed Curve
The current/speed curve function allows you to establish a current limit
lower than the standard current limits of the drive (specified in parameters 8
[Current Lim Pos] and 9 [Current Lim Neg]) and reduce the output current
(torque) of the drive through a defined curve of five equally divided set
points as the speed increases based on a threshold speed, effectively
reducing torque.
• Enable the current/speed curve function by setting parameter 750
[TrqTpr_Enable] to 1 “Enabled”.
• Set the current limit (for both directions of rotation in four quadrant
drives) in parameter 751 [TrqTpr_Lim0]. The value specified in this
parameter overrides the value of parameters 8 [Current Lim Pos] and 9
[Current Lim Neg].
• Set the threshold speed at which current (torque) reduction begins in
parameter 756 [TrqTpr_Spd].
• Set the first reduced current limit in parameter 752 [TrqTpr_Lim1]. The
value defined in this parameter must be less than the value in parameter
751 [TrqTpr_Lim0] and greater than the values in parameters 753
[TrqTpr_Lim2], 754 [TrqTpr_Lim3] and 755 [TrqTpr_Lim4].
• Set the second, third and final reduced current limits in parameters 753
[TrqTpr_Lim2], 754 [TrqTpr_Lim3] and 755 [TrqTpr_Lim4],
respectively. The value of each subsequent parameter must be less than
the previous parameter’s value. The drive will maintain the value
specified in parameter 755 [TrqTpr_Lim4] up to the value set in
parameter 162 [Max Feedback Spd].
Par 10 [Cur Lim Pos Out]
or
Par 11 [Cur Lim Neg Out]
Par 751 [TrqTpr_Lim0]
Current/Speed
Par 162 [Max Feedback Spd]
Par 752 [TrqTpr_Lim1]
Par 753 [TrqTpr_Lim2]
Par 754 [TrqTpr_Lim3]
Par 755 [TrqTpr_Lim4]
Par 756 [TrqTpr_Spd]
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