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IRZ-700 series soft start drives for ESP


Control, monitoring of parameters and protection of submersible motors with power ranging from 14 to 400 kW, with smooth start and stop.


  • 4 start modes: start with current increase, start with current limitation, inching start, direct start
  • 2 stop modes: smooth deceleration, run-down stop
  • manual or automatic control
  • continuous control of electric mains parameters, currents in three phases and isolation resistance of the “pump transformer — power cable — motor” link
  • calculation of voltages and currents imbalance, power factor, load factor, power consumption, operating time
  • connection of surface readout units of telemetry systems of various manufacturers
  • registration of monitored parameters and reasons for motor shutdown in real time with saving records in case of power failure
  • protection of equipment from emergency caused by failures in the electric mains and submersible motor
  • automatic reclosure when parameters return to the operating range

The drive provides connectivity to the following equipment:

  • socket on the operator panel with a rated voltage of 220 V and a current consumption of up to 10 A
  • socket with a rated voltage of 380 V and phase current of up to 60 A
  • remote control systems (normally closed and normally open contacts)
  • the SCADA-system by means of RS-232 or RS-485 interface via the Modbus-RTU exchange protocol
  • GPRS modem with the ability to upload information to the Internet


  • various modes of start and stop
  • small dimensions and weight
  • easy operation and maintenance
  • easy connection
  • highly informative liquid crystal display
  • ability to save history to a USB-drive
  • software update without shutting down the motor
  • compliance with the requirements of oil companies and GOST R 51321.1
  • bus design of the power systems
  • ability to include in the drive a set of electricity metering devices included in the State Register of Measuring Instruments


DesignationRated current, AOverall dimensions, mmWeight, kg
IRZ-721-160 160 1755x795x635 160
IRZ-721-250 250 170
IRZ-722-400 400 185
IRZ-723-630 630 190
IRZ-724-800 800 200
IRZ-725-1000 1000 240
Supply voltage 190—520 V
Power of the connected motor 14—400 kW
Monitoring of the motor operating current (performed according to the transformer primary winding with recalculation into the motor actual operating current) 0—2000 A
Control of insulation resistance of the “transformer — power cable — motor” link 0—10000 kOhm
Control of turbine rotation frequency 1—50 Hz
Error of monitored current, voltage, rotation frequency and time setting 2 %
Insulation resistance monitoring error 5 %
Operating temperature -60…+60 °С
Enclosure protection class IP43 (or IP54)