Product Description: SEW Eurodrive 31C055-503-4-00 Frequency Converter

Product Model: 31C055-503-4-00

Brand: SEW Eurodrive (Germany)

Series: MOVITRAC® 31C

Type: Three-phase Vector Control Frequency Converter 

I. Product Overview

31C055-503-4-00 is a compact three-phase inverter from the MOVITRAC 31C series of German SEW Eurodrive company. It is designed to provide high-precision and high-dynamic speed and torque control for 5.5kW three-phase asynchronous motors. It offers multiple modes such as V/F control and sensorless vector control (SVC), and is widely used in industrial automation scenarios such as material conveying, fans and pumps, textile, and packaging.

II. Core Technical Parameters

1. Electrical Specifications

Rated Power: 5.5 kW

Input Voltage: Three-phase 380~500 VAC, 50/60 Hz

Input Current: 11.8 A (rated at 400V)

Output Current: 12.0 A (rated at 380V) / 9.0 A (rated at 500V)

Control Modes: V/F Control, Sensorless Vector Control (SVC)

Overload Capacity: 150% rated current, continuous for 60 seconds

Switching Frequency: Up to 16 kHz (low-noise operation)

Protection Grade: IP20

Braking Function: Built-in braking chopper (4-quadrant operation)

2. Mechanical and Environmental

Dimensions (W×H×D): 150 × 184 × 218 mm

Weight: Approximately 10.0 kg

Operating Temperature: 0°C ~ +45°C

Storage Temperature: -20°C ~ +65°C

Humidity: ≤ 90% RH (no condensation)

Anti-Vibration: 0.5 g (10~55 Hz)

III. Main Functional Characteristics

1. High-performance Control

Sensorless Vector Control (SVC): High torque output at low speeds, up to 150% torque at 0.5Hz, high control accuracy and fast dynamic response.

V/F Control: General-purpose control, suitable for standard asynchronous motors and multi-motor drives.

Torque Control: Supports torque limit and torque control modes, meeting requirements for tension control, compression, etc.

Precise Speed Regulation: Frequency resolution 0.01 Hz, speed regulation range 1:50 (SVC).

2. Complete Protection Functions

Overcurrent, overvoltage, undervoltage protection

Motor overheating protection (PTC)

Output short circuit, grounding fault protection

Overload, stall prevention protection

3. Industrial Communication and Usability

Standard Interface: RS-485 (Modbus RTU), supports remote monitoring, parameter reading and writing.

Optional Expansion: Supports PROFIBUS-DP, DeviceNet, CANopen, etc. field buses.

Operation Panel: LED / LCD display, local parameter setting, status monitoring, fault query.

Parameter Copy: Supports parameter upload and download, batch debugging, rapid parameter replacement.

4. Practical Application Functions

Multiple Speed Control: 16 speed segments programmable, suitable for complex process flows.

PID Regulator: Built-in PID, implements constant pressure, constant flow, constant temperature closed-loop control.

Jump Frequency: 3 jump frequency points, avoiding mechanical resonance.

Braking Function: Built-in DC braking + braking chopper, supports rapid stopping, energy feedback.

IV. Typical Application Scenarios

Conveying Equipment: Belt conveyors, roller conveyors, elevators, scraper conveyors → Smooth start and stop, precise speed regulation, load distribution

Fans and Pumps: Centrifugal fans, pumps, compressors → Energy-saving operation, constant pressure / constant flow control

Textile Machinery: Spinning machines, weaving machines, dyeing and finishing machines → High-precision synchronization, tension control

Packaging Machinery: Filling machines, sealing machines, labeling machines → Quick start and stop, precise positioning

Machine Tools / Light Industry Machinery: Lathes, milling machines, printing machinery → High dynamic response, stable operation V. Power Comparison of Series Models

31C040-503-4-00: 4.0 kW

31C055-503-4-00: 5.5 kW (Current Model)

31C075-503-4-00: 7.5 kW

VI. Product Advantages

German Quality: SEW's century-old industrial drive technology, stable and reliable, with long lifespan.

Compact Design: Small in size, easy to install, saves cabinet space.

All-in-One Control: SVC vector + V/F + torque control, multi-purpose in one machine.

Friendly Communication: Standard Modbus + multiple bus options, easy to connect to automation systems.

High Cost Performance: Industrial-grade performance, affordable price, the preferred choice for small and medium power drives.

Four-Quadrant Operation: Built-in braking chopper, rapid braking, energy-saving and efficient.