SK320 Series Single-Phase 220V to Three-Phase 380V VFD Selection Guide

Preface

Welcome to the SK320 Series Single-Phase 220V to Three-Phase 380V VFD Selection Guide. This guide provides detailed model descriptions, technical parameters, application scenarios, selection methods, and precautions for the SK320 Series VFDs, helping you select the appropriate product model based on your actual needs to ensure stable and reliable system operation.

Table of Contents

• Product Overview
• Model Description
• Technical Parameters
• Application Scenarios
• Selection Method
• Selection Examples
• Precautions
• Installation and Maintenance

Product Overview

SK320 Series Features

The SK320 Series Single-Phase 220V to Three-Phase 380V VFD is a high-performance variable frequency drive specially designed to solve the problem of driving three-phase motors in single-phase power environments. This series adopts advanced AC-DC-AC frequency conversion technology, which can convert single-phase 220V AC power to three-phase 380V variable frequency AC power, providing a stable operating environment for three-phase motors.

Main Advantages

• Single-Phase Input, Three-Phase Output: Solves the problem of driving three-phase motors in single-phase power environments
• Vector Control Technology: Provides high-precision speed and torque control
• Wide Voltage Range: Adapts to power grid fluctuations, input voltage range: 180-260VAC
• Multiple Control Methods: Supports V/F control, open-loop vector control
• Comprehensive Protection Functions: Overload, overvoltage, undervoltage, overtemperature, short circuit and other multiple protections
• Built-in Brake Unit: Standard brake unit, optional brake resistor
• Communication Function: Supports Modbus RTU communication protocol for easy system integration
• Compact Size: Compact design saves installation space

Model Description

Model Naming Rules

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SK320 - □□□□ - □□
  │       │    │
  │       │    └── Special Function Code
  │       └─────── Rated Power
  └────────────── Series Name

Special Function Code Explanation

Common Model List

Technical Parameters

Basic Parameters

Protection Functions

Environmental Parameters

Communication Parameters

Application Scenarios

The SK320 Series Single-Phase 220V to Three-Phase 380V VFD is suitable for the following scenarios:

1. Home and Small Workshops

• Driving three-phase motors in single-phase power environments
• Woodworking machinery, small machine tools, textile machinery, etc.

2. Commercial Places

• Central air conditioning fans, pump control
• Commercial kitchen equipment, refrigeration equipment

3. Agricultural Applications

• Irrigation pumps, drainage equipment
• Agricultural machinery, breeding equipment

4. Temporary Power Supply Places

• Construction site temporary equipment
• Field operation equipment

5. Special Occasions

• Stage lighting equipment
• Testing equipment, laboratory equipment

Selection Method

Basic Selection Principles

1. Selection Based on Motor Power: The rated power of the VFD should be greater than or equal to the rated power of the motor
2. Consider Load Characteristics: Choose the appropriate VFD type based on different load types
3. Consider Usage Environment: Factors such as temperature, humidity, and altitude will affect the actual output capability of the VFD
4. Reserve Capacity: It is recommended that the VFD capacity be 10%-20% larger than the actual motor demand

Load Types and Selection

Derating Conditions

Selection Examples

Example 1: Woodworking Engraving Machine

Equipment Parameters:

• Spindle Motor: 3.7kW three-phase asynchronous motor
• Input Voltage: Single-Phase 220VAC
• Load Type: Variable load with certain impact
• Usage Environment: Indoor, temperature 25°C, altitude 500m

Selection Process:

1. Motor Power: 3.7kW
2. Load Factor: Consider variable load, take 1.5
3. Calculated Capacity: 3.7kW × 1.5 = 5.55kW
4. Selected Model: SK320-0075-M (7.5kW heavy-duty type)

Selection Result: SK320-0075-M

Example 2: Irrigation Pump

Equipment Parameters:

• Pump Motor: 5.5kW three-phase asynchronous motor
• Input Voltage: Single-Phase 220VAC
• Load Type: Fan and pump load
• Usage Environment: Outdoor, temperature 35°C, altitude 800m

Selection Process:

1. Motor Power: 5.5kW
2. Load Factor: Fan and pump load, take 1.0
3. Environmental Factor: Temperature 35°C, altitude 800m, no derating required
4. Selected Model: SK320-0055-P (5.5kW pump special type)

Selection Result: SK320-0055-P

Precautions

Selection Precautions

1. Power Capacity Confirmation: The VFD has a large input current, ensure sufficient power capacity
2. Motor Parameter Matching: Ensure the VFD matches the motor parameters
3. Starting Torque Requirements: For loads requiring high starting torque, vector control mode is recommended
4. Harmonic Interference: VFDs generate harmonics that may affect other equipment, filters may be required if necessary
5. EMC Requirements: Confirm whether additional EMC measures are needed based on the usage scenario

Usage Limitations

1. Maximum Power Limitation: SK320 series supports a maximum of 11kW
2. Long-Distance Wiring: When output cables exceed 50m, it is recommended to install output reactors
3. High-Temperature Environment: When temperature exceeds 40°C, derating or enhanced heat dissipation is necessary
4. Continuous Overload: Long-term overload operation is not allowed

Installation and Maintenance

Installation Requirements

1. Installation Direction: Install vertically to ensure good heat dissipation
2. Installation Clearance: Left and right sides ≥50mm, top and bottom ≥100mm
3. Ventilation Requirements: Ensure good ventilation around, no obstacles
4. Grounding Requirements: Reliable grounding, grounding resistance ≤4Ω

Maintenance

1. Regular Inspection: Check once a quarter
2. Cleaning Maintenance: Regularly clean cooling fans and heat sinks
3. Wiring Inspection: Check if terminal connections are loose
4. Parameter Backup: Regularly back up parameter settings

Common Fault Handling

Appendix

Product Dimension Diagram

[SK320 Series Product Dimension Diagram Inserted Here]

Installation Dimension Table

Order Information

For ordering SK320 series VFDs or obtaining more technical support, please contact our sales and technical team:

• Phone: +86 15064999739
• Email: [email protected]
• Website: www.omnimech.cc

Disclaimer: The content of this manual is subject to change without notice. Please refer to the actual product.