Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual User Manual
Page 473
Rockwell Automation Publication 750-PM001J-EN-P - October 2014
473
Application Notes
Appendix B
Execute Pump Off Action
When a Pump Off condition exists, the drive follows the setting of P1189
[Pump Off Action]. The process starts over at
in this sequence
allowing five strokes to allow the pump to settle out.
Whenever the operator changes the base speed command, the process starts over
at
in this sequence.
When P1187 [Pump Off Config] is set to 2 “Cycle,” the full stroke torque is used
for pump off detection. A separate position counter is enabled, which uses the
gear ratio and speed feedback to create a position. The gear ratio must be set
correctly for this action to work.
•
The position increments every 2 ms based on output frequency. The
torque is added to a buffer and a counter increments.
•
When the position counter reaches 10,000, the counter is reset to 0. The
torque buffer is divided by the counter to create the average torque for the
cycle.
•
This torque is the full cycle torque and is then used as the down stroke
torque was used in baseline set detection.
Table 1 - PowerFlex 753 Pump Off Test Points
Test Point
Description
TP 2031
Motor Torque in Pump Off
TP 2032
Top Of Stroke in Pump Off
TP 2033
POSITION1 in Pump Off
TP 2034
POSITION2 in Pump Off
TP 2035
POSITION3 in Pump Off
TP 2036
POSITION4 in Pump Off
TP 2037
POSITION5 in Pump Off
TP 2038
Active Position in Pump Off
TP 2039
Position State in Pump Off
TP 2040
Heavily filter torque for position detection in Pump Off
TP 2041
PumpJack control state in Pump Off
TP 2042
Avg Torque used for control state in Pump Off
TP 2043
Cycle count in Pump Off
TP 2044
Alarm count in Pump Off
TP 2045
Peak Torque in Pump Off
TP 2046
Offset Position in Pump Off
TP 2047
Simulator Torque Ref
TP 2048
Minimum Torque Position
TP 2049
Active Pump Off level
TP 2050
Down Stroke Torque Integrator
TP 2051
Full Stroke Position for cycle mode
TP 2052
Adjustment to Position indicator