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IRZ-500 variable speed drives for ESPs with asynchronous motors

The station ensures control, parameters monitoring and protection of submersible asynchronous motors with power ranging from 5 to 320 kW enabling smooth acceleration and deceleration and speed control.


  • adaptive control algorithms
  • service modes: jogging, anti-jamming, gas bleeding, shaking, proportional-integral control, voltage optimization
  • history recording to a USB Flash
  • integrated sinusoidal output filter
  • software update without motor operation interruption
  • highly informative graphic display
  • bus design of the power system


  • manual or automatic control
  • motor smooth acceleration and deceleration, motor speed control
  • continuous control of electric mains voltage, order of phase sequence, current values in three phases and isolation resistance of the “pump transformer — power cable — motor” link
  • calculation of voltages and currents unbalance, power factor, load factor, consumed power
  • connection to the ground acquisition unit of the downhole sensor system
  • record of parameters controlled and causes of motor shutdown in real-time mode with saving of records during power interruptions
  • automatic maintenance of reservoir fluid pressure at a specified level
  • automatic variation of sustained operating point to ensure production at the level close to well capacity
  • minimization of motor's emergency shutdowns due to reliable predicting and automatic response to all potential malfunctions in a well or aboveground equipment
  • protection of equipment against emergency modes caused by failures in the electric mains and motor

After actuation of the protection system, the station automatically restarts when parameters return to the working range.

The control station

  • allows for connection of appliances with 220 V rated voltage to a female connector on the operator’s panel of the station
  • can be integrated into oilfield telemechanics
  • can be connected to a SCADA-system via RS-232 or RS-485 interfaces
  • has a GPRS-modem to transmit data via Internet
Supply voltage, V 190…520
Power of connected motor, kW 5…320
Range of motor rotation frequency control, Hz 0.5…100 (spacing 0.1)
Control of motor operating current, A  0…2000
Control of insulation resistance of the “pump transformer – cable – motor” link, kOhm 0…10000
Control of turbine rotation frequency, Hz 1…50
Error of current, voltage, rotation frequency and time setting control, % 2
Error of insulation resistance control, % 5
Enclosure protection class IP43 (or IP54)
Operating temperature, °С -60…+50


DesignationRated current of control station, АOverall dimensions, mmWeight, kg
IRZ–510–63 63 1750х950х900 420*
IRZ–511–250 250 380
IRZ–512–400 400 1870х1000х1200 390
IRZ–513–630 630 540
IRZ–514–800 800 620
IRZ–515–1000 1000 2050х1300х1300 800
IRZ-516-1200 1200 880

* — with built-in output isolation transformer

Built-in sinusoidal filter provides output voltage of the control station with the waveform distortion factor not more than 5%.

Без фильтра       С фильтром
No filter   With filter
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