462 Rockwell Automation Publication 750-PM001N-EN-P - February 2017
Appendix C Application Notes
Enter Pump Data
Enter pump data and adjust parameter settings.
Enter Desired Bus Regulation Data
The following parameter settings assume that a dynamic brake resistor is used.
The following positive and negative torque limits are calculated on powerup and
entered by the drive.
• P670 [Pos Torque Limit] is calculated using the motor parameters.
• P671 [Neg Torque Limit] is calculated using the dynamic-brake resistor
ohmic value and rated torque of the motor. If a dynamic brake resistor is
not used, the default negative torque limit is used.
Change P426 [Regen Power Lmt] to match the value in P671 [Neg Torque
Limit] to maximize dynamic brake performance.
Parameter Setting
Pump Jack
P1178 [Motor Sheave] Diameter in inches.
P1179 [OilWell Pump Cfg] 1 “Pump Jack”
P1181 [Gearbox Limit] Percent of P1182 [Gearbox Rating]
P1182 [Gearbox Rating] Nameplate gearbox rating.
P1183 [Gearbox Ratio] Nameplate gear ratio.
P1184 [Gearbox Sheave] Diameter in inches.
Pump Off
P1187 [Pump Off Config] 0 “Automatic” (Default)
P1189 [Pump Off Action] Select preferred action.
P1190 [Pump Off Control] 0 “Disable” (Default)
Parameter Setting
Brake Features
P372 [Bus Reg Mode A] 2 “Dyn Brake”
(1)
(1) If no dynamic braking resistor is used, set P372 [Bus Reg Mode A] to 1 “Adjust Freq” (Default).
Speed is sacrificed for bus regulation and P524 [Overspeed Limit] must be adjusted.
P382 [DB Resistor Type] 1 “External”
P383 [DB Ext Ohms] Based on performance preference.
P384 [DB Ext Watts] Based on performance preference.
P385 [DB ExtPulseWatts] Based on performance preference.
Motor Overload
P409 [Dec Inhibit Actn] 0 “Ignore”
Load Limits
P426 [Regen Power Lmt] Set to match the value that is calculated for P671 [Neg Torque Limit], see
below this table.
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