RWRAPS LW2R-100 2P AC 220V 100A Automatic Transfer Switch for Solar Inverter User Manual

1. Introduction and Overview

The RWRAPS W2R series dual-power automatic transfer switch is a micro household power transfer switch designed to ensure continuous power supply. This switch automatically detects the status of the normal power source and, if abnormal, seamlessly transfers to the spare power source. This mechanism guarantees the continuity, reliability, and safety of your power supply system.

Specifically designed for household orbit-type installation, it is ideal for use in Din-Rail power distribution boxes. The W2R Series ATS is suitable for emergency power supply systems with 50 or 60Hz alternating current, rated up to 400V and 100A. It features a compact structure, reliable transfer capabilities, convenient installation and maintenance, and a long operational lifespan. This device is crucial for applications where continuous power is essential and power failure is not permissible. It supports both electrical and manual operation and complies with the requirements of Low-Voltage switchgear and control gear as specified by IEC 60947-6-1.

2. Product Features

• Silver Contacts: Utilizes silver contacts to significantly enhance conductivity and extend the product's service life.
• Ease of Use: Includes a built-in regular standby opening signal output port, allowing connection to a signal indicator light for convenient observation outside the cabinet.
• Robust Performance: Offers good insulation, high-temperature resistance, anti-aging properties, ensuring safe and reliable operation.
• Safety Assurance: In the event of an abnormal normal power supply, the backup power supply activates immediately to maintain continuity, reliability, and safety of the power supply.
• Versatile Application: Suitable for automatic switching to a backup power supply during outages and returning to the main power supply upon restoration.

3. Specifications

4. Safety Information

Before installation or operation, please read and understand all safety warnings and instructions. Failure to do so may result in electric shock, fire, serious injury, or death.

• Qualified Personnel: Installation and maintenance must be performed by qualified electricians only.
• Power Disconnection: Always disconnect all power sources before working on the ATS or connected equipment. Verify that power is off using a voltage tester.
• Proper Grounding: Ensure the ATS and all connected equipment are properly grounded according to local electrical codes.
• Environmental Conditions: Do not install the ATS in wet, humid, or explosive environments. Ensure adequate ventilation.
• Correct Wiring: Follow the wiring diagrams precisely. Incorrect wiring can lead to equipment damage or safety hazards.
• Overcurrent Protection: Ensure appropriate overcurrent protection devices are installed upstream of the ATS.

5. Setup and Installation

The RWRAPS LW2R-100 ATS is designed for Din-Rail mounting within a power distribution box. Ensure the installation location is dry, well-ventilated, and free from corrosive gases or excessive dust.

5.1 Components Overview

Image 1: Front view of the RWRAPS LW2R-100 Automatic Transfer Switch. This image displays the main components including the Normal Power A and Reverse Power B input/output terminals, the manual/auto selector switch, and indicators for power status.

Image 2: Bottom view of the RWRAPS LW2R-100 Automatic Transfer Switch, highlighting the integrated DIN rail mounting clip for easy installation in compatible enclosures.

5.2 Mounting

1. Ensure all power is disconnected from the distribution box.
2. Locate an available section of the Din-Rail within the distribution box.
3. Align the ATS with the Din-Rail and press firmly until the mounting clip engages securely.
4. Verify that the ATS is firmly attached and does not wobble.

5.3 Wiring Connections

Refer to the labels on the device for correct terminal identification. The ATS typically has two main power inputs (Normal Power A and Reverse Power B) and one load output.

• Normal Power A (Solar Energy/Main Power): Connect the primary power source (e.g., solar inverter output) to the terminals labeled 'Normal Power A'.
• Reverse Power B (City Power/Backup Power): Connect the secondary or backup power source (e.g., grid power or generator) to the terminals labeled 'Reverse Power B'.
• Load Output: Connect the electrical load (e.g., household circuits) to the output terminals.
• Signal Output (Optional): If desired, connect a signal indicator light to the built-in standby opening signal output port for remote status monitoring.

Ensure all connections are tight and secure. Double-check all wiring against local electrical codes and the device's specific wiring diagram before restoring power.

6. Operating Instructions

The RWRAPS LW2R-100 ATS offers both automatic and manual operation modes.

6.1 Automatic Mode

1. Set the selector switch on the front of the ATS to the 'Auto' position.
2. Restore power to both Normal Power A and Reverse Power B sources.
3. The ATS will automatically detect the presence of Normal Power A and connect the load to it.
4. If Normal Power A becomes abnormal or fails, the ATS will automatically switch the load to Reverse Power B.
5. When Normal Power A is restored and stable, the ATS will automatically switch the load back to Normal Power A.

6.2 Manual Mode

Manual operation allows you to override the automatic function and select the desired power source directly.

1. Set the selector switch on the front of the ATS to the 'Manual' position.
2. Use the rotary handle to manually select between 'Normal Power A' (I) or 'Reverse Power B' (II).
3. Ensure the switch is fully engaged in the desired position.
4. Caution: Always ensure the load can handle the selected power source's characteristics (voltage, frequency) before manual transfer.

7. Maintenance

Regular maintenance ensures the longevity and reliable operation of your RWRAPS LW2R-100 ATS.

• Periodic Inspection: Annually inspect the ATS for any signs of physical damage, loose connections, or discoloration due to overheating.
• Cleaning: With power disconnected, gently clean any dust or debris from the unit using a soft, dry cloth or compressed air. Do not use liquid cleaners.
• Terminal Tightness: Periodically check and tighten all terminal screws to ensure good electrical contact.
• Functional Test: Periodically test the automatic transfer function by simulating a failure of the normal power source (e.g., by temporarily disconnecting it, if safe to do so). Observe if the switch transfers correctly to the backup power.
• Contact Inspection: If accessible and safe, inspect the silver contacts for excessive wear or pitting. This should only be done by qualified personnel.

8. Troubleshooting

If you encounter issues with your RWRAPS LW2R-100 ATS, refer to the following troubleshooting guide. Always ensure power is disconnected before performing any internal inspections or repairs.

9. Warranty and Support

For warranty information and technical support, please refer to the documentation provided with your purchase or contact your retailer. Keep your purchase receipt as proof of purchase for any warranty claims.

For further assistance, please contact RWRAPS customer support through their official channels.