Low voltage frequency converters

General characteristics

  • Motor start and speed control;
  • Reverse;
  • Acceleration, deceleration, shutdown;
  • Motor and converter protection;
  • Dynamic braking during shutdown;
  • “Pick up” in motion;
  • Technological parameter PI-control;
  • Preset speed parameters;
  • Auto-reclosing;
  • Linear or S-shaped velocity controller.

The converter consists of:

  • Input three-phase current-limiting reactor;
  • Radio frequency interference filter (optional);
  • Circuit breaker or contactor with fuses (converters for currents from 160 to 630 A);
  • Converter power unit;
  • Dynamic braking device (converters for currents from 160 to 630 A, optional);
  • Rectifier with regeneration mode (only applied in converters for currents from 160 to 630 A, optional);
  • Microprocessor control system;
  • Console terminal;
  • Output filter limiting voltage rise time on motor excitation winding – dU / dt or sinus (optional).

Control system

  • Motor control
    U/f control (linear, quadratic, programmable control):
    – permissible tolerance of output voltage with a rated input voltage and change of current at converter output from zero to a rated value is not exceeding ± 3%;
    – permissible tolerance of output voltage frequency from a rated value with the change of current at converter output from zero to a rated value and change of input voltage in specified range – not exceeding ± 1%;
    – converters provide for operation at 1.5 x current overload for 120 sec;
    – output voltage frequency range – from 0 to 200 Hz;
    – efficiency – at least 95% (over 53 kW), at least 93% (below 53 kW);
    – power factor – at least 0,9;
    – operating mode: continuous. Vector with a real-time identification of electric drive parameters. There is a mode of automatic presetting of engine parameters.
  • Protection system
    – short-circuit currents protection;
    – prohibited current overload protection;
    – dump or unacceptable decrease in the supply input voltage;
    – unacceptable increase of the supply input voltage;
    – overtemperature of semiconductor power devices;
    – phase failure of the input and output voltages;
    – short circuits to ground protection.
    – engine overheating protection;
  • Types of sensors
    – Tachogenerator;
    – Pulse speed and position sensors;
    – Selsin;
    – Temperature sensors;
    – Pressure sensors, etc
  • Administration programs
    – Basic program;
    – Main program;
    – Local – remote control;
    – PI-regulation;
    – Control over pumps and fans;
    – Administration according to the requirements of the customer.

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