Model Code Explanation

• 31B: MOVITRAC 31B series, compact regenerative inverter

• 075: Rated power 7.5 kW, rated output current 16 A

• 503: 3-phase 380–500 V AC input, no built-in EMC filter

• 4: 4-quadrant operation with regenerative braking

• 00: Standard firmware, no fieldbus modules and no STO safety function

Technical Specifications

Input

• Rated voltage: 3-phase AC 380–500 V

• Frequency: 50 / 60 Hz (±5%)

• Rated input current: 13.8 A

Output

• Rated power: 7.5 kW

• Rated output current: 16 A

• Apparent power: 11 kVA

• Frequency range: 0–400 Hz

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

Control & Interfaces

• Control modes: V/F open-loop control, sensorless vector control (VFC)

• Digital I/O: 6 digital inputs, 2 digital outputs, 1 relay output

• Analog I/O: 2 analog inputs, 2 analog outputs

• Protection functions: Overcurrent, overvoltage, undervoltage, overtemperature, earth fault and short circuit protection

Mechanical & Environmental Data

• Protection class: IP20

• Operating temperature: 0 °C ~ +45 °C (power derating required above 40 °C)

• Storage temperature: -25 °C ~ +70 °C

• Dimensions (W×H×D): approx. 185 × 300 × 220 mm

• Weight: approx. 3 kg

Key Features

1. 4-quadrant energy regeneration

   Braking energy is recycled and transmitted back to the power grid. External brake resistors are not required, which saves cost and simplifies system layout.
2. Stable control performance

   Supports V/F and sensorless vector control, delivering steady torque and reliable speed regulation for various industrial loads.
3. Compact and durable structure

   Small footprint for easy cabinet installation. IP20 protection and complete fault protection ensure long-term stable operation.
4. Flexible expandability

   An external EMC filter can be equipped to meet relevant EMC standards. Optional fieldbus modules are available for network communication and remote control.

Typical Applications

Related Models

• 31B055-503-4-00: 5.5 kW, 4-quadrant regenerative inverter

• 31B075-503-1-00: 7.5 kW, 3-quadrant standard inverter (without regeneration)

• 31B110-503-4-00: 11 kW, 4-quadrant regenerative inverter