Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual - Manual (Page 123)

Rockwell Automation Publication 750-PM001J-EN-P - October 2014 123
Drive Port 0 Parameters Chapter 3
SPEED C
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Speed Re
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649 Alt Speed Reg Kp
Alternate Speed Regulator Kp
Provides an independent setting for the same function as P645 [Speed Reg Kp], but is
active only when Automatic Feedback Loss Switchover occurs (indicated by Bit 5 of P936
[Drive Status 2]). This value is automatically calculated based on the bandwidth setting
in P648 [Alt Speed Reg BW] and P76 [Total Inertia]. The proportional gain may be
manually adjusted by setting P648 [Alt Speed Reg BW] to a value of zero. Default:
Min/Max: 20.00
0.00 / Calculated RW Real
650 Alt Speed Reg Ki
Alternate Speed Regulator Ki
Provides an independent setting for the same function as P647 [Speed Reg Ki], but is
active only when Automatic Feedback Loss Switchover occurs (indicated by Bit 5 of P936
[Drive Status 2]). This value is automatically calculated based on the bandwidth setting
in P648 [Alt Speed Reg BW], P649 [Alt Speed Reg Kp] and P653 [Spd Loop Damping].
Integral gain may be manually adjusted by setting P648 [Alt Speed Reg BW] to a value
of zero. Default:
Min/Max: 50.00
0.00 / 100000.00 RW Real
651 AltSpdErr FltrBW
Alternate Speed Error Filter Bandwidth
Provides an independent setting for the same function as P644 [Spd Err Fltr BW], but is
active only when Automatic Feedback Loss Switchover occurs (indicated by Bit 5 of P936
[Drive Status 2]).
When P648 [Alt Speed Reg BW] is set to a non-zero value, this filter setting will be
automatically selected. If P648 [Alt Speed Reg BW] is set to zero, then this filter setting
must be manually adjusted. An error filter value of 0 will disable the filter. This filter is
normally set to at least 3 to 5 times the value of P648 [Alt Speed Reg BW]. Units for the
error filter are radians/second (R/S).
The rules that are used to set the error filter bandwidth in automatic mode are as
follows:
1. If the alternate motor velocity feedback is Open Loop, then the error filter is set to 5
times P648 [Alt Speed Reg BW].
2. If an alternate motor velocity feedback device has been selected and P704 [InAdp
LdObs Mode] = 1 “InertiaAdapt,” then the error filter is set to 3 times P648 [Alt Speed
Reg BW].
3. If an alternate motor velocity feedback device has been selected and P704 [InAdp
LdObs Mode] 0 “Disabled” or 2 “LoadObserver” then the error filter is using a table
look up value determined by the setting of P129 [Alt Vel FdbkFltr].
Units:
Default:
Min/Max: R/S
50.00
0.00 / 8000.00 RW Real
652 SReg Trq Preset
Speed Regulator Torque Preset
Sets the initial value of P654 [Spd Reg Int Out]. This is the output of the vector speed
regulator’s integral channel, and will be present in P654 [Spd Reg Int Out] when the
regulator is first enabled (for example, upon rise of start or jog). The normal, default
setting for this parameter is zero. In some applications, it may be necessary to preset the
speed regulator integrator to a non-zero setting. This will result in the regulator’s output
reaching its final steady state value sooner than it would if the integrator started from
zero. Units:
Default:
Min/Max: %
0.00
–/+800.00 RW Real
653 Spd Loop Damping
Speed Loop Damping
Sets the damping factor of the vector speed loop’s characteristic equation. Damping will
affect the integral gain when a non-zero bandwidth has been entered. A damping factor
of 1.0 is considered critical damping. Lowering the damping will produce faster load
disturbance rejection, but may cause a more oscillatory response. When the speed
regulator bandwidth is zero, gains are set manually and damping factor has no effect. Default:
Min/Max: 1.0000
0.5000 / 65.0000 RW Real
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Description Values
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