Rockwell Automation Liqui-Flo DBT Reach Drive - Manual (Page 131)

Parameter Descriptions 3-105
Contains the encoder pulses per revolution. For improved operation in FVC Vector
mode, PPR should meet or exceed (64 x motor poles).
Displays raw encoder pulse count. For single channel encoders, this count will
increase (per rev.) by the amount in Encoder PPR (413). For quadrature encoders,
this count will increase by 4 times the amount defined in Encoder PPR (413).
Provides a monitoring point that reflects speed as seen from the feedback device.
!
ATTENTION: When operating the drive with encoder feedback selected
(Feedback Select (80) = 3 (Encoder)), a loss of encoder signal may
produce an overspeed condition. For differential encoders, Motor Fdbk
Type (412) should be selected as option 1 or 3 to detect the loss of an
encoder signal. The user is responsible for ensuring that the driven
machinery, all drive-train mechanisms, and application material are
capable of safe operation at the maximum operating speed of the drive.
Overspeed detection in the drive determines when the drive shuts down.
The factory default for overspeed detection is set to 10.0 Hz (or 300.0
RPM) greater than the Maximum Speed (82). Failure to observe this
precaution could result in equipment damage, sever injury or loss of life.
413 Encoder PPR
Range: 2 to 20000 PPR [1 PPR]
Default: 1024 PPR
Access: 1 Path: Motor Control>Speed Feedback
See also:
414 Enc Position Fdbk
Range: -/+ 2147483647 [1]
Default: Read Only
Access: 1 Path: Motor Control>Speed Feedback
See also:
415 Encoder Speed
Range: -/+ 420.0 Hz or -/+ 25200.0 RPM [0.1Hz or 0.1 RPM]
Default: Read Only
Access: 1 Path: Motor Control>Speed Feedback
See also: 79