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technical description
Frequency converters and other power electronics devices
• Vector controlled converter:
  AFC 200 (1-phase supply)
• Vector controlled converter:
  MFC 710 (3-phase supply)
• Regenerative converter:
  MFC 710AcR
• Vector controlled converter:
  MFC 710/500V
• Vector controlled converter:
  MFC 710/690V
• Three-level frequency
  converter: MFC 810 1140V
• Solar inverter
• Electric Vehicle Inverter
• Educational drives for
  Technical Universities
DC drives
• Thyristor based rectifiers TZP type
Drive sets and power distribution / control Units
• Drive sets TZS and PZS type
Power distribution / Control units, Power supplies
• Pulse DC Power Supply ZI type (20V / 25A)
• ZRS, TZG and TZE
• Control panels,
  potentiometers, wires
Discontinued products
• AFC 120
• AFC 150
• MFC 311
• MFC 310
Thyristor System UT type
Download order form (pdf)

MFC810 type
55 - 800 kW
1140 V

The drive MFC810 series is designed to control induction motors with a rated voltage 1000/1140V.
 Modular design, 3-level topology and a liquid cooling system predispose this series for installation in areas with relatively low cubature.

Main features:
  • Three-phase supply: 3x1140 V  50/60 Hz
  • Output: 0 – 400 Hz, 3 x 1140 V
  • Advanced control modes:
                   U/f (linear, square-law scalar),
                   Vector mode (sensor or sensorless)
  • Removable operating panel with LCD alphanumeric display
  • Integrated Logic Controller (PLC)
  • Built-in "reeler-calculator"
  • Built-in pump or fan set controller
  • Integrated PID controller
  • Embedded communication module RS232/RS485 (Modbus)
  • Programmable fixed frequencies
  • Digital potentiometer function
  • Direct rotational (or linear) incremental encoder (5V line interface)
  • Elimination of resonance frequencies bands
  • Definable shapes and slopes of selected frequency characteristic (linear, "S"-shaped)
  • Allowable work with torque control
  • Automatic identification of motor parameters
  • Programmable control structure:
    • two customizable control variants (A & B):
    • speed selector block (control panel, analog input, PID controller, digital potentiometer, function block),
    • torque selector block(analog inputs, function block),
    • run and direction control (control panel, digital input, function block),
    • programmable digital inputs: run, direction, run blockade, external trip, trip cancellation,
    • programmable digital outputs (3 relays and 1 open collector type): ready, run, fault, warning, overtemperature of heatsink, given speed reaching, threshold speed reaching, current limit, function block),
    • programmable analog outputs: frequency, rotational speed, output current, voltage, loading of motor, function block.
  • Total work counter (hours)
  • Real-time Clock (optional)
  • Diagnostic and blockade system
  • Control panel protection with system of passwords
  • Memory for 4 motors parameters
  • Allowable use of default values for all parameters

download flyer (pdf)


MFC810 250kW 1000V - exemplary embodiment

(c) TWERD Power Electronics