Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual - Manual (Page 128)

128 Rockwell Automation Publication 750-PM001J-EN-P - October 2014
Chapter 3 Drive Port 0 Parameters
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No. Display Name
Full Name
Description Values
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UE CONTROL
Iner
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Comp
695 Inertia CompMode
Inertia Compensation Mode
The inertia compensation function calculates a feed forward torque signal P699 [Inertia
Comp Out]. Inertia compensation attempts to predict the motor torque required to
accelerate and decelerate an inertial load. The P699 [Inertia Comp Out] signal is
summed with P660 [SReg Output] and becomes an input available to the P313 [Actv
SpTqPs Mode] selector. The inputs to the inertia comp function are the rate of change of
motor speed reference and P76 [Total Inertia]. Only active in Flux Vector (FV) motor
control modes (P35).
This parameter enables the inertia comp function and selects possible sources of motor
speed reference as follows:
“Disabled” (0) – Inertia compensation function is disabled. P699 [Inertia Comp Out] is
zero so the motor torque reference is not affected.
“Int Ramp Ref” (1) – Inertia compensation is enabled. The function is configured to use
the rate of change of P595 [Filtered Spd Ref]. This is the typical setting that should be
used for inertia compensation on a stand-alone drive.
“Ext Ramp Ref” (2) – Inertia compensation is enabled. The function is configured to use
the rate of change of P700 [Ext Ramped Ref]. This setting is available for applications
that supply a ramped speed reference external to the drive.
“Spd Rate Ref” (3) – Inertia compensation is enabled. The function is configured to use
the P596 [Speed Rate Ref]. This parameter should contain a value that represents the
rate of change of the motor speed reference. This setting is available for applications
that supply a ramped speed reference external to the drive.
Default:
Options: 0 = “Disabled”
0 = “Disabled”
1 = “Int Ramp Ref”
2 = “Ext Ramp Ref”
3 = “Spd Rate Ref” RW 32-bit
Integer
696 Inertia Acc Gain
Inertia Acceleration Gain
Sets the acceleration gain for the inertia compensation function. A value of 1 produces
100% compensation. Only active in Flux Vector (FV) motor control modes (P35).
Default:
Min/Max: 1.0000
0.0000 / 2.0000 RW Real
697 Inertia Dec Gain
Inertia Deceleration Gain
Sets the deceleration gain for the inertia compensation function. A value of 1 produces
100% compensation. Only active in Flux Vector (FV) motor control modes (P35).
Default:
Min/Max: 1.0000
0.0000 / 2.0000 RW Real
698 Inert Comp LPFBW
Inertia Compensation Low Pass Filter Bandwidth
Sets the bandwidth of a low pass filter for the inertia compensation function. The output
of this filter supplies P699 [Inertia Comp Out].Only active in Flux Vector (FV) motor
control modes (P35).
Units:
Default:
Min/Max: R/S
35.00
0.00 / 2000.00 RW Real
699 Inertia Comp Out
Inertia Compensation Output
Displays the output of the inertia compensation function. The P699 [Inertia Comp Out]
signal is summed with P660 [SReg Output] and becomes an input available to the P313
[Actv SpTqPs Mode] selector. Inertia compensation provides a torque feed forward signal
during changes in motor speed reference.Only active in Flux Vector (FV) motor control
modes (P35).
Units:
Default:
Min/Max: %
0.00
–/+800.00 RO Real
700 Ext Ramped Ref
External Ramped Reference
This parameter is meant for an external motor speed ramp input signal. This signal will
be used by the inertia compensation function when P695 [InertiaComp Mode] = 2 “Ext
Ramp Ref.” This parameter will be entered in units of Hz or RPM, depending on the value
of P300 [Speed Units].Only active in Flux Vector (FV) motor control modes (P35).
Units:
Default:
Min/Max:
Hz
RPM
0.00
–/+P27 [Motor NP Hertz] x 8
–/+P28 [Motor NP RPM] x 8 RW Real
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