Microprocessor-controlled high-voltage thyristor frequency converters of the MPCFV series are designed to regulate the speed of rotation of mechanisms with synchronous drive motors of 6 and 10 kV with power from 1 to 10 MW.
Frequency converters are used to control pumps, smoke exhausters, fans, mills, and power supplies:
- frequency start of the drive motor with a predetermined ramp from zero to a predetermined speed with a starting current limit of 1.1 In.
- control of the drive motor speed in the range of 1:10 with automatic limitation of the motor current at the level of (1 - 1.1) In.
- braking of the drive motor with energy recovery (return) to the power supply network;
- re-enabling the drive when the electric motor is rotating at runaway speed in the operating speed range;
- automatic synchronization of the drive motor with the power supply network based on the principle of precise synchronization with subsequent switching to mains power supply;
- limiting the current and torque of the drive motor in steady-state and transient modes;
- display of the converter operation parameters;
- display of the converter operation parameters;
- in the local control mode - setting the speed from the remote control on the converter panel door.
- in the remote control mode, communication with an external automation system via digital and analog signals.
Frequency converters have the following types of protection:
- against unacceptable current overloads and overvoltages;
- against internal and external short-circuit currents;
- from the disappearance or unacceptable reduction of the supply voltage for own needs;
- from the loss of voltage of one of the phases of auxiliary needs;
- from reducing the excitation current of the motor below the permissible value;
- from exceeding the permissible speed;
- against opening the doors of power cabinets in the presence of power voltage;
- against microprocessor control system failures;
- from a thyristor breakdown in a high-voltage power panel;
- against damage to the cooling system.