Model Code Explanation

• 31C: MOVITRAC 31C series, compact 4‑quadrant drive

• 370: Rated power 37 kW, rated output current 75 A

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

• 4: 4‑quadrant operation with energy regeneration

• 07: Wide temperature version, no STO, no fieldbus

Technical Specifications

Input

• Rated voltage: 3‑phase AC 380–500 V (±10%)

• Input frequency: 50 / 60 Hz (±10%)

• Rated input current: 69 A @ 400 V

Output

• Rated power: 37 kW (50 HP)

• Rated output current: 75 A @ 400 V

• Apparent power: 52 kVA

• Frequency range: 0–400 Hz

• Overload capacity: 150% / 60 s; 180% / 2 s

Control & Interfaces

• Control modes: V/F open‑loop, sensorless vector control (SVC)

• Digital I/O: 7DI / 2DO / 1 relay

• Analog I/O: 2AI / 2AO

• Safety: No STO

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

Mechanical & Environmental

• Protection class: IP20

• Operating temperature: ‑20 °C to +55 °C (wide range)

• Storage temperature: ‑25 °C to +70 °C

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

• Weight: 21.8 kg

Key Features

1. 4‑quadrant energy regeneration

   Recycles braking energy back to the grid, saves energy and eliminates external brake resistors.

2. Wide temperature tolerance

   Operates reliably in ‑20 °C to +55 °C, suitable for cold storage, outdoor, and harsh industrial environments.

3. High‑power compact design

   Size 4 enclosure delivers 37 kW in a space‑saving footprint for heavy loads.

4. Stable motor control

   Supports both V/F and sensorless vector control for consistent speed/torque.

Typical Applications

Related Models

• 31C370-503-4-00: Standard temperature (0–45 °C), no STO, no fieldbus

• 31C370-503-4-05: Standard temperature, with STO, no fieldbus

• 31C370-503-4-20: Standard temperature, PROFIBUS‑DP, no STO

• 31C370-503-4-25: Standard temperature, PROFIBUS‑DP + STO