U1T-220/400-DC/LT Variable Frequency Drive Unit

Module Feature

U1T-220/400-DC/LT belongs to U1T heavy-duty variable frequency drive series. It adopts high-performance IGBT power module, supporting V/F control and sensorless vector control. This model supports DC bus input and can work with external DC power supply system. Low-temperature hardware design guarantees stable startup and operation under cold environment. Digital control board reserves multiple analog and digital I/O terminals, standard Modbus RTU communication interface for PLC and industrial network connection. Equipped with high-power cooling fan and reinforced metal housing, suitable for continuous heavy-load operation. Widely applied in heavy-duty conveyors, large water pumps, mining auxiliary equipment and other low-temperature field motor speed control scenarios.

Working principle

AC or DC input power supplies the DC bus circuit of the drive. IGBT inverter converts DC into adjustable frequency and voltage AC power to drive the motor. The motor speed changes with output frequency adjustment. When the motor decelerates, regenerative energy returns to DC bus; external braking resistor consumes excess energy to avoid overvoltage trip.

Onboard components

DC bus terminal module, IGBT power module, DC bus capacitor, main control PCB, digital/analog I/O terminal block, high power cooling fan, operation keypad, status indicator panel, surge protection circuit.

LED indicators

Power LED, run LED, fault alarm LED.

Hardware self-diagnosis

Overvoltage, undervoltage, overcurrent, over-temperature, short circuit, ground fault detection, records fault code and historical operation logs.

Programming software

Manufacturer PC software for parameter backup, real-time running monitoring and firmware upgrade.

Electrical & Process Parameters

Model:U1T-220/400-DC/LT Brand: Device type:U1T Series Heavy Duty 3-phase Variable Frequency Drive Rated power:220kW Rated voltage:400V Control mode:V/F, Sensorless vector control Power input:DC bus input compatible Communication:Modbus RTU Cooling:Forced air cooling Protection:Overcurrent, overvoltage, undervoltage, over temperature, short circuit, earth fault

Mechanical & Structure

Mounting:Panel mount inside control cabinet Protection class:IP20 Housing:Metal painted reinforced enclosure

Environmental

Operating temperature:-30℃ ~ +50℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non-condensing Certification:CE compliant Status: Original low temperature heavy-duty VFD for industrial motor variable speed control

Installation

Follow strict ESD and high voltage safety procedure before handling. Mount the drive vertically in control cabinet and reserve sufficient ventilation space. Connect DC bus power cable and motor cable to corresponding terminals, set motor nameplate parameters before commissioning.

Interface

DC power input terminals, motor output terminals, digital/analog I/O terminals, Modbus communication port, keypad interface.

Diagnostic

Drive trip on startup: motor cable short circuit, wrong motor parameters or winding insulation damage. Over temperature fault: cooling fan failure or insufficient cabinet ventilation. No communication: incorrect Modbus station address or wiring error.

Product Brief

U1T-220/400-DC/LT U1T series low temperature heavy-duty variable frequency drive, 3-phase 220kW 400V, DC bus input supported, IP20 panel mount, for heavy machinery, pump and conveyor speed regulation.