Purpose MPCHN frequency converters are designed to control the rotational speed of mechanisms driven by synchronous motors with power ratings ranging from 320 to 1600 kW.
MPCHN frequency converters feature a low-voltage power section. The drive power circuit is based on a two-transformer configuration, including a step-down power transformer at the input and a step-up transformer at the output.
MPCHN Technical Specifications
| Parameter | Value |
|---|---|
| Power Range | 320–1600 kW |
| Drive Motor Type | Synchronous |
| Power Circuit Configuration | Two-transformer design (low-voltage power section) |
| Speed Control Range | 1:10 |
| Motor Current Limitation | (1–1.1) In, automatic |
| Braking | Regenerative braking with energy feedback to the grid |
MPCHN frequency converters provide:
- smooth frequency-controlled starting of the drive motor at a specified acceleration rate;
- motor speed control within a 1:10 range with automatic limitation of motor current to (1–1.1) In;
- continuous operation at a constant speed within the specified control range and highly accurate speed stabilization;
- motor braking with regenerative energy feedback to the power supply network;
- restart of the drive while the motor is coasting within the operating speed range;
- automatic synchronization of the drive motor with the power supply network based on the principle of precise synchronization, followed by transfer to direct mains operation;
- limitation of motor current and torque in both steady-state and transient operating conditions.
Applications
MPCHN low-voltage frequency converters are used wherever smooth starting and precise control of high-power synchronous drives are required:
- Oil and Gas Industry — main oil and gas pumping stations, compressor units;
- Water Supply and Wastewater Systems — booster pumping stations, sewage and artesian water pumping stations;
- Metallurgy and Mining — mill drives, main mine ventilation fans, conveyor systems;
- Power Generation — feedwater pump drives, induced draft fans, and forced draft fans at thermal power plants;
- Chemical and Cement Industries — compressor drives, mixers, and rotary kilns.
Advantages of MPCHN from PC-Electric
- Energy savings of up to 30–50% — compared to fixed-speed drives, thanks to motor operation in the optimal mode;
- Energy regeneration — electrical energy is fed back into the grid during braking, which is not possible with standard low-voltage VFDs without an active front-end rectifier;
- Extended equipment service life — smooth starting eliminates shock loads on the motor, couplings, and driven machinery;
- Ukrainian manufacturing — fast production, local service support, warranty coverage, and no currency-related risks;
- Customization to project requirements — equipment configuration is engineered according to the parameters of each specific customer facility.