Product Description: SEW Eurodrive 31C040-503-4-00 Frequency Converter

Product Model: 31C040-503-4-00

Brand: SEW Eurodrive (Germany)

Series: MOVITRAC® 31C

Type: Three-phase Vector Control Frequency Converter (Frequency Inverter)

I. Product Overview

31C040-503-4-00 is a compact three-phase frequency converter of the MOVITRAC 31C series from SEW Eurodrive. It is designed for 4kW three-phase asynchronous motors and offers high-precision, high-dynamic speed and torque control. It supports various 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, packaging, etc.

II. Core Technical Parameters

1. Electrical Specifications

Rated Power: 4 kW

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

Input Current: 8.8 A (rated at 400V)

Output Current: 9.6 A (rated at 400V)

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

Brake Function: Built-in brake chopper (4-quadrant operation)

2. Mechanical and Environmental

Weight: Approximately 8.0 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, fast dynamic response.

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

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

Precise Speed Regulation: Frequency resolution 0.01 Hz, speed 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 change.

4. Practical Application Functions

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

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

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

Brake Function: Built-in DC braking + brake 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, finishing machines → High precision synchronization, tension control

Packaging machinery: Filling machines, sealing machines, labeling machines → Quick start-stop, precise positioning

Machine tools / light industry machinery: Lathes, milling machines, printing machinery → High dynamic response, stable operation

V. Series Model Power Comparison

31C030-503-4-00: 3.0 kW

31C040-503-4-00: 4.0 kW (current model)

31C055-503-4-00: 5.5 kW

31C075-503-4-00: 7.5 kW

VI. Product Advantages

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

Compact design: Small size, easy installation, saves cabinet space.

All-in-one control: SVC vector + V/F + torque control, one machine for multiple uses.

Friendly communication: Standard Modbus + multiple bus options, easy integration into automation systems.

High cost-effectiveness: Industrial-grade performance, affordable price, preferred choice for small and medium power drives.

Four-quadrant operation: Built-in braking chopper, rapid braking, energy-saving and efficient.