Rockwell Automation 20B PowerFlex 700 Custom Firmware - Pump Off - Manual (Page 4)

4 PowerFlex 700 with Vector Control Option Custom Firmware
Rockwell Automation Publication 20B-IN020C-EN-P - January 2014
4 682 [Pump Off Control] • Disabled - pump off control is not active.
• Baseline Set - Uses a torque baseline created when the drive is first run (first ten cycles).
IMPORTANT: It is critical that this data is gathered from a full well.
• Fixed Setpt - Uses the value in parameter 685 [Torque Setpoint].
5 683 [Pump Off Config] • Automatic - The downstroke torque is used if the position is found. If the position is not
found after 6 cycles, the cycle torque is used.
• Position - The downstroke torque is used to determine the “pump off” condition.
• Cycle - The cycle torque is used to determine the “pump off” condition. The gear ratio
and output speed are used to determine the cycle. If the average torque is unstable,
compare testpoint 717 to the torque waveform. Testpoint 717 is the calculated position
used to determine a full stroke. If the position moves compared to the torque, the gear
ratio can be adjusted to account for the motor slip.
6 684 [Pump Off Action] • Change Spd - The speed is lowered when a “pump off” condition occurs; the drive does
not stop. See [Pump Off Speed].
• Always Stop - This stops the drive during a “pump off” condition.
• Stop After 1 - The drive first slows down according to the setting in parameter 687. If
torque continues to drop, the drive stops.
• Stop After 2 - The drive slows down according to the setting in parameter 687 twice
before stopping.
7 685 [Torque Setpoint] This sets the level for a “pump off” condition when [Pump Off Control] is set to Fixed Setpt.
8 686 [Pump Off Level] Sets the percentage drop in torque that indicates the well is in a “pump off” condition.
The pump off level based on the baseline torque can be seen at testpoint 645.
9 687 [Pump Off Speed] Sets the speed reduction (in percent) from the commanded speed that occurs during a
“pump off” condition when parameter 684 is set to Change Spd, Stop After 1 or Stop After 2.
10 688 [Pump Off Time] Sets the time delay before speed recovers from a “pump off” condition, unless torque
continues to drop.
11 178 [Sleep Wake Mode] Direct - Uses the time in parameter 688 as the time to remain in “pump off” condition.
A digital input also needs to be set for Stop.
Pump Stroke Position Initialization Steps (cont.)
Step Parameter Description