Product Description: SEW 31C300-503-4-00 Frequency Converter

Model: 31C300-503-4-00

Brand: SEW SAEW

Series: MOVITRAC 31C

Rated Power: 30 kW

Input Power Supply: Three-phase 380~500V, 50/60Hz

Rated Output Current: 72 A

Version Code: 00 (General Standard Version) 

I. Product Overview

31C300-503-4-00 is a 30kW high-power general-purpose vector frequency converter of the SEW 31C series. It adopts a high-performance sensorless vector control (VFC) and V/F control dual mode, featuring strong heavy-load driving capability, and is equipped with a built-in braking unit, specifically designed for industrial heavy-load applications and long-term continuous operation scenarios.

II. Core Technical Parameters

Control Mode: V/F Control + Sensorless Vector Control (VFC)

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

Output Frequency: 0–400 Hz

Carrier Frequency: Up to 16 kHz

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

Standard Communication: RS485, Modbus RTU

Protection Grade: IP20 (installed in cabinet)

Cooling Method: Forced air cooling

Operating Temperature Range: 0°C ~ +45°C (no capacity reduction)

Applicable Motors: Three-phase asynchronous motors, 30kW

Dimensions: Approximately 260 × 450 × 280 mm

Weight: Approximately 16 kg

III. Core Functional Characteristics

High-performance Vector Control: Sensorless vector control, 150% rated torque output at 0.5Hz, smooth startup and stable low-speed operation.

SVPWM Space Vector Modulation: Low motor harmonics, low noise, and low temperature rise, with significant energy-saving effect.

Built-in Intelligent PID Regulator: Supports closed-loop process control such as constant pressure water supply, constant temperature, and constant current.

Multiple Speeds and Program Running: 16 programmable multi-speed settings, supporting automatic operation of complex process flows.

Mechanical Resonance Suppression: 3 sets of adjustable jump frequencies, effectively avoiding mechanical system resonance points.

Comprehensive Protection Mechanism: Overcurrent, overvoltage, undervoltage, output short circuit, grounding fault, motor overload, overheating, etc., multiple protections.

Parameter Management Convenience: Supports parameter copying on the operation panel and PC software (DriveStudio) debugging.

Extensive Expansion Capability: Optional PROFIBUS, CANopen, DeviceNet, etc. industrial bus communication modules.

IV. Typical Application Domains

Heavy-duty Material Transportation: Large belt conveyors, scraper conveyors, bucket elevators

High-power Fans and Water Pumps: Industrial fans, centrifugal pumps, compressors, central air conditioning systems

Machine Tools and Heavy Equipment: Heavy lathes, milling machines, grinding machines, press machine main drive

Light Industry Machinery: Textile, printing, packaging, plastic machinery, rubber equipment

Metallurgy, Mining, Construction Materials: Rolling mill auxiliary drive, crushing and screening, kiln equipment

V. Power Comparison of the Same Series

31C220-503-4-00: 22 kW

31C300-503-4-00: 30 kW (current model)

31C370-503-4-00: 37 kW

VI. Product Advantages

SEW Original Quality, Industrial-grade Reliability, Suitable for Long-Term Full-load Operation

High Vector Control Accuracy, Wide Speed Regulation Range, Good Low-Speed Stability, Significant Energy-saving Effect

Compact Structure, Excellent Heat Dissipation Design, Stable Operation at High Ambient Temperatures

Standard Interfaces, Strong Compatibility, Easy Integration with Various PLCs, HMI Systems

Global Service Network, Complete Technical Support, Adequate Spare Parts Supply