Rockwell Automation 20D PowerFlex 700S with Phase I Control Reference Manual - Manual (Page 142)

142 Rockwell Automation Publication PFLEX-RM002D-EN-E - August 2013
Chapter 1 Detail Drive Configuration and Operation
Sensorless
Sensorless mode is used when zero speed or more than a 120:1 speed range is not
required.
Parameter 548 [Est Speed Fdbk] contains the estimated motor speed, used when
sensorless mode is selected. The estimated speed feedback is based on voltage
feedback from the motor. [Est Speed Fdbk] is scaled so that a value of 4096
equals parameter 4 [Motor NP RPM].
The estimated speed feedback is converted to RPM, which can be seen in
parameter 74 [Motor Spd Est].
Parameter 75 [MtrSpd Est Posit] is an estimated position for sensorless mode. It
is calculated based on [Est Speed Fdbk] and the value in parameter 226 [Virtual
Edge/Rev]. [Virtual Edge/Rev] is a user defined value for the number of pulses
per motor revolution.
Motor Simulator
The simulator mode allows the drive to be operated without a motor connected
and is meant for demo purposes only. If a motor is connected with this mode
selected very erratic and unpredictable operation will occur.
Parameter 76 [MtrSpd Simulated] contains the simulated speed feedback and is
scaled in units of RPM.
Parameter 70 [MtrSpd Sim Posit] contains the simulated position feedback. It is
calculated based on the simulated speed feedback and the value in [Virtual Edge/
Rev]. [Virtual Edge/Rev] is a user defined value for the number of pulses per
motor revolution.
548 74
75
Accum
Σ
Motor Spd Est
226 Virtual Edge/Rev
/
4096
Est Speed Fdbk
MtrSpd Est Posit
76
70
Motor
Simulator
Spd Calc
MtrSpd Simulated
MtrSpd Sim Posit Accum
Σ
226 Virtual Edge/Rev