Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual - Manual (Page 68)

68 Rockwell Automation Publication 750-PM001J-EN-P - October 2014
Chapter 3 Drive Port 0 Parameters
Drive (Port 0) Feedback & I/O
File
Fil
e
Gr
oup
No. Display Name
Full Name
Description Values
Re
ad
-Write
Da
ta
T
yp
e
FEEDBA
CK & I/O
Fe
edback
125 Pri Vel Fdbk Sel
Primary Velocity Feedback Select
Selects the source of the P3 [Mtr Vel Fdbk] and P131 [Active Vel Fdbk] that will be used
when the drive is in operation without an Automatic Tach Switchover. Possible
selections include: Port 0 – Open Loop Fdbk, Port 0 – Simulator Fdbk, and any Port that
contains a feedback module (for example, Encoder).
The Disabled and Open Loop Fdbk selections are functionally equivalent, with Open
Loop being the default setting. Open Loop velocity feedback is estimated based on P1
[Output Frequency] and P5 [Torque Cur Fdbk], adjusted using P621 [Slip RPM at FLA].
Simulator Fdbk is available in the Flux Vector selections for P35 [Motor Ctrl Mode].
Simulator velocity feedback is calculated based on P690 [Limited Trq Ref] and P76 [Total
Inertia]. This selection is useful for drive operational checkout and test when motor
movement is undesired. In simulation mode, gating of the power inverter section of the
drive is disabled.
Selection of any option module port that contains an encoder module results in P3 [Mtr
Vel Fdbk] based on a measured value. Data obtained from the selected feedback module
will be used to determine motor velocity feedback.
Primary feedback refers to the Automatic Feedback Loss Switchover option. This option
will automatically switch from the primary to the alternate feedback source upon loss of
the primary feedback source. If this option is not being used, then the primary feedback
will always be the active feedback source. The active feedback source is typically the
primary feedback. Default:
Min/Max: 137
1 / 159999 RW 32-bit
Integer
126 Pri Vel FdbkFltr
Primary Velocity Feedback Filter
Adjusts a filter setting that is applied to the motor velocity feedback source that is
selected by P125 [Pri Vel Fdbk Sel]. The purpose of this filter is to reduce the level of
noise in the feedback signal.
Make a selection for a value that is higher than the value in parameter 636 [Speed Reg
BW].
This is moving average type filter that has a delay setting of N, where N is an integer
number (0, 1, 2 …). A setting of zero provides no filtering and no delay. Larger values of
N result in more filtering and more delay. The best setting for this filter depends on the
level of noise in the feedback signal and the bandwidth setting of the velocity regulator.
In the Flux Vector selections for P35 [Motor Ctrl Mode], setting P636 [Speed Reg BW] to
a non-zero setting places the drive in an automatic gain/filter adjustment mode. When
the drive is in this automatic adjustment mode, the value of P666 [Speed Comp Gain]
and possibly P644 [Spd Err Fltr BW] are adjusted, based on the setting of P126 [Pri Vel
FdbkFltr]. The automatic setting of P644 [Spd Err Fltr BW] becomes independent of the
feedback filter setting when P704 [InAdp LdObs Mode] is set to 1 “InertiaAdapt.” Default:
Options: 3 – 50R/S Noise
0 – 190R/S Noise
1 – 160R/S Noise
2 – 100R/S Noise
3 – 50R/S Noise
4 – 25R/S Noise
5 – 12R/S Noise
6 – 6R/S Noise
7 – 3R/S Noise RW 32-bit
Integer
127 Pri Vel Feedback
Primary Velocity Feedback
Output of the Primary Velocity Feedback Delay filter, in units of Hz or RPM, depending
on the value of P300 [Speed Units]. Adjustment of the delay filter is made using P126
[Pri Vel FdbkFltr]. The Primary Velocity Feedback is used when the drive is operating
without an Automatic Tach Switchover. Units:
Default:
Min/Max:
Hz
RPM
0.00
–/+P27 [Motor NP Hertz] x 8
–/+P28 [Motor NP RPM] x 8 RO Real
128 Alt Vel Fdbk Sel
Alternate Velocity Feedback Select
Selects the source of the P3 [Mtr Vel Fdbk] and P131 [Active Vel Fdbk] to be used when
the drive is in operation with an Automatic Tach Switchover.
Alternate feedback refers to the Automatic Feedback Loss Switchover option. This option
will automatically switch from the primary to the alternate feedback source upon loss of
the primary feedback source. If this option is not being used, then the primary feedback
will always be the active feedback source. The active feedback source is typically the
primary feedback. Default:
Min/Max: 137
1 / 159999 RW 32-bit
Integer