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IRZ-410 variable-frequency drive for sucker rod pumps (SRP)

The station ensures control, parameters monitoring and protection of SRP electric motors with power ranging from 5 to 55 kW enabling smooth acceleration, deceleration and speed control.


  • possibility to change the swinging rate without replacement of pulleys and shutdown
  • possibility to connect downhole sensor (thermomanometric) systems of different producers
  • smart control algorithms: calculation of pump fill, flow rate, downhole and ground equipment loads, automatic adjustment for max flow rate, reduction of plunger-liquid impacts
  • possibility to connect a dynamograph
  • history recording to a USB FlashCard
  • software update without shutdown of the sucker rod pump unit
  • informative four line display
  • compliance with the requirements of oil companies and GOST R51321.1-2007


  • manual or automatic control
  • motor smooth acceleration and deceleration
  • energy saving
  • motor rotor speed control
  • swinging start to overcome jamming (heavy start)
  • continuous control of line voltage, phase sequence, three-phase current values
  • calculation of voltage and current unbalance, power factor, load factor, power consumption, non-failure operation time
  • record of parameters controlled and causes of motor shutdown in real-time mode with saving of records during power interruptions
  • minimization of emergency shutdowns and increase in flow rate due to automatic control of rotation frequency
  • protection of equipment against emergency modes caused by faults in the electric mains and sucker rod pump unit
  • after actuation of the protection system, the station automatically restarts when parameters return to the working range

The control station

  • can be integrated into oilfield telemechanics (normally closed or normally open contacts)
  • can be connected to a SCADA-system via RS-232 or RS-485 interface using the MODBUS.RTU communications protocol
  • has a GPRS-modem to transmit data via Internet
Supply voltage, V 190…520
Power of connected motor, kW 5…55
Range of motor rotation frequency control, Hz 0.5…100 (spacing 0.1)
Error of current, voltage, rotation frequency and time setting control, % 2
Enclosure protection class IP54
Operating temperature, °C -60…+50


The station can be equipped with an input line filter to ensure that voltage and current wave from distortion factor at the control station input is not more than 10%.

Upon request, the control station may include a power metering system registered in the State Register of Measuring Devices.

DesignationRated current, АOverall dimensions, mmWeight, kg
IRZ–410–60 60 1100х860х350 100
IRZ–410–110 210 120
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