1. General Description

2. Model Code Explanation

• MC31C: MOVITRAC 31C series

• 370: Basic rated power 37 kW (50 HP); 125% continuous overload up to 45 kW (60 HP)

• 450: Specification code for 380–500 V AC, 75 A output and integrated brake chopper

3. Electrical Specifications

• Input: 3-phase AC 380–500 V (±10%), 50/60 Hz, input current 69 A

• Output: 52 kVA, rated output current 75 A, output voltage 0–480 V

• Frequency range: 0–600 Hz

• Rated power: 37 kW at normal operation; 45 kW at 125% continuous overload

• Overload capability: 125% rated current for continuous operation; 150% rated current for 60 seconds

• Control modes: V/f control, sensorless vector control

• Brake system: Integrated brake chopper for 4-quadrant operation

4. Mechanical & Environmental Data

• Protection class: IP20, suitable for cabinet installation

• Cooling method: Forced air cooling

• Dimensions (W × H × D): 220 × 550 × 265 mm

• Weight: Approximately 19 kg

• Operating temperature: -10 °C to +50 °C. Power derating is required above 50 °C

• Altitude: Derate 1% per 100 m above 1000 m, maximum applicable altitude 2000 m

5. I/O & Communication

• I/O configuration: 6 digital inputs, 2 digital outputs, 1 relay output, 1 analog input (0–10 V / 4–20 mA)

• Communication: RS485 interface with Modbus RTU; optional fieldbus cards

• Motor monitoring: Supports TF, PTC and TH temperature detection

6. Key Features

1. Integrated brake chopper enables stable 4-quadrant operation for potential energy and regenerative loads.

2. Wide input voltage range adapts to fluctuating power grid conditions.

3. Dual control modes meet the demands of fans, pumps and heavy-duty machinery.

4. Strong overload capacity handles impact load during motor start-up and temporary heavy operation.

7. Applications