Rockwell Automation Allen-Bradley PowerFlex 700S - Linear Feedback Devices

Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011 131
Detailed Drive Operation Chapter 1
Parameter 234 [Encdr 0/1 Error] indicates the status of the encoder when there is
an error.
The encoder blocks generate position feedback, seen in parameter 230 [Encdr0
Position] or parameter 240 [Encdr1 Position]. Encoder position is in quadrature
counts (the drive counts 4x the encoder PPR per motor revolution).
The encoder blocks generate speed feedback, seen in parameter 231 [Encdr0 Spd
Fdbk] and parameter 241 [Encdr1 Spd Fdbk].
Linear Feedback Devices
A Linear Feedback device requires a Multi-Device Interface (MDI) feedback
option card. Refer to the PowerFlex 700S AC Drive Phase II Control Frames 1…6
Installation Instructions, publication 20D-IN024
, for information on supported
linear feedback devices.
Note: the linear feedback devices can be used only for position feedback, and are
not used for motor speed feedback.
The position feedback (displayed in parameter 252 [FB Opt1 Posit]) counts at a
rate which depends on the linear feedback sensor used. Parameter 253 [FB Opt1
Spd Fdbk] contains the speed feedback from the linear feedback device.
231
230
241
240
233
232
242
234
Encoder 0
Processing
Encoder 1
Processing
Encdr 0/1 Error
To Feedbac
k
Selection
To Feedbac
k
Selection
Encoder0 PPR
Encoder1 PPR
Encdr 0/1 Cnfig
Encdr0 Position
Encdr0 Spd Fdbk
Encdr1 Position
Encdr1 Spd Fdbk