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VCHRP-TM – an universal VFD for AC industrial loads up to 17,500 kVA with 3 kV, 6 kV and 10 kV nominal output voltage. Due to high quality of development and production, VCHRP-TM can operate with the already installed and the new asynchronous or synchro- nous motors.
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+7 (8352) 39-57-41, 39-50-88, 39-50-85, 55-52-65

fax +7(8352) 62-38-74
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Digital three phase EPU1М-7


EPU1М-7 – a digital DC drive based on digital signal processors, replaces analog electric EPU1M, EPU1, BTU, ETU,BUV etc.



One modification of the device combines the following features:

  • two-band and single-band mode speed control;
  • a wide adjustment range;
  • overload capacity choice (up to 6 – in modifications for 25A, 40A, 100A, up to 4 - modification for 200A, up to 3 - modification for 400A, 630A);
  • integration into the CNC system or the use in general-purpose mechanisms;
  • Multiple methods of drive control (via logic inputs, built-in or remote control via PC);.
  • Integration in the ACS via the serial interface RS-485.

Digital loops are realized in the drive control system based on digital signal processors:

  • Digital loop of the armature current;
  • Digital speed loop;
  • Digital loop of the excitation current;
  • Digital loop of the EMF;
  • Digital system of pulse-phase control (SPPC) of current armature circuit of reversed thyristor converter;
  • Digital SPPC of excitation circuit of unidirectional thyristor converter.

The presence of the digital control loops provides high accuracy and speed, greatly simplifies the commissioning and configuration, in compare with analog drives.


Advantages of digital EPU1Ь-7 in compare with analog drives:

  • Easy to install (no need to set the jumpers and potentiometers)
  • independent phase sequence of mains;
  • auto - configuration of the drive and determination of specific parameters of the motor (no need for manual adjustment and tuning circuits);
  • selection and storage of up to 4 sets of parameters with different settings for different motors, which enables a more flexible and quick configuration of the drive to the specified requirements;
  • expanded set of protections;
  • monitoring of basic parameters
  • thyristors diagnosis;
  • archive of the last events;
  • Flexible control panel with LCD display with 2 lines of 20 characters;
  • configure and control via PC;
  • control via RS-485;
  • set of various options gives wide opportunities (to use as a starter, the ability to use in voltage regulator mode for active or active-inductive load);
  • Modular design allows you to quickly repair the device;
  • Flexible and quick revision of software on customer's specifications.


  • against an open circuit of the speed feedback;
  • against overheating the motor (with RTC);
  • against continuous overload (I2t);
  • against exceeding the specified speed;
  • against exceeding the maximum current of the armature;
  • against overvoltage in the armature circuit;
  • against breakage in the armature excitation circuit;
  • against exceeding of the maximum current excitation;
  • against overheating of the converter;
  • against an unacceptable voltage reduction;
  • against a power failure in the power circuit.

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