1. Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of your QLWAHK DC Surge Protective Device (SPD). This device is designed to protect electrical systems and equipment from transient overvoltages caused by lightning strikes and switching operations. Please read this manual thoroughly before installation and retain it for future reference.
2. Safety Information
WARNING: Electrical shock hazard. Installation and maintenance should only be performed by qualified personnel.
- Always disconnect power before installing or servicing the SPD.
- Ensure proper grounding according to local and national electrical codes.
- Do not operate the device if it appears damaged.
- Verify that the SPD's voltage and current ratings match your system requirements.
- Wear appropriate personal protective equipment (PPE) during installation.
3. Product Overview
The QLWAHK DC Surge Protective Device (SPD) is a modular unit designed for DIN rail mounting, providing protection against surges in DC power systems. It features a visual warning module for easy status indication.
Figure 3.1: QLWAHK DC Surge Protective Device (SPD) modules. Each module consists of a red protective cartridge and a white base unit, designed for easy installation and replacement.
3.1 Components
Figure 3.2: Labeled diagram of the DC SPD, highlighting key components such as input terminals, indicator windows, and electrical ratings.
- Input Terminals (DC+, DC-): For connecting to the DC power lines.
- Indicator Window: Displays the operational status (Green for normal, Red for fault).
- Ground Wire End: Connection point for the protective earth ground.
- Removable Cartridge: The red module containing the surge protection components, designed for easy replacement.
3.2 Visual Warning Module
The SPD incorporates a visual indicator to provide immediate feedback on its operational status.
Figure 3.3: Visual warning module status indicators. Green indicates normal operation, while red indicates a fault condition requiring attention.
- Green Indicator: The device is functioning correctly and providing surge protection.
- Red Indicator: The device has absorbed a significant surge and is no longer providing protection. It requires replacement.
4. Specifications
The following table details the technical specifications for the QLWAHK DC Surge Protective Device (SPD).
Figure 4.1: Product dimensions and parameter table. This image provides a visual representation of the device's physical size and a summary of its technical specifications.
| Parameter | Value |
|---|---|
| Product Name | Lightning Protection Device |
| Product Function | Lightning Protection |
| Product Material | PC flame retardant shell |
| Mounting | 35mm Rail Mounting |
| Nominal Discharge Current (In) | 20KA |
| Maximum Discharge Current (Imax) | 40KA |
| Certificate | CE |
| Degree of Protection | IP20 |
| Input Voltage (DC) | DC500V (also available in DC800V/DC1000V variants) |
| Poles | 3P |
| Item Weight | 1.76 ounces |
| Package Dimensions | 1.18 x 0.79 x 0.39 inches |
5. Setup and Installation
IMPORTANT: Installation must be carried out by a qualified electrician in compliance with all applicable electrical codes and standards.
- Power Disconnection: Before beginning any installation, ensure that the main power supply to the system is completely disconnected and locked out to prevent accidental re-energization.
- Mounting: The SPD is designed for 35mm DIN rail mounting. Snap the device securely onto the DIN rail within your electrical panel.
- Wiring Connections:
- Connect the DC+ line from your system to the DC+ terminal of the SPD.
- Connect the DC- line from your system to the DC- terminal of the SPD.
- Connect the ground wire from your system's protective earth to the ground wire end terminal of the SPD. Ensure all connections are tight and secure.
- Verification: Double-check all wiring connections for correctness and tightness. Ensure no loose wires are present.
- Power Restoration: Once installation is complete and verified, restore power to the system. Observe the indicator window on the SPD. It should display a green color, indicating normal operation.
6. Operating Instructions
The QLWAHK SPD operates automatically to protect your system from surges. User interaction is primarily limited to monitoring the status indicator.
- Normal Operation: When the indicator window displays GREEN, the SPD is functioning correctly and actively protecting your electrical system from transient overvoltages.
- Fault Condition: If the indicator window displays RED, it signifies that the SPD has absorbed a significant surge and its protective elements are no longer functional. In this state, the device requires immediate attention and replacement to restore surge protection.
7. Maintenance
The QLWAHK SPD is designed for minimal maintenance. Regular inspection of the indicator window is the primary maintenance task.
- Periodic Inspection: Periodically check the indicator window on the SPD. The frequency of inspection should be determined by the criticality of the protected system and the likelihood of surge events in your area.
- Replacement of Faulty Module: If the indicator window turns RED, the protective cartridge has failed and needs to be replaced. Disconnect power to the system, carefully remove the faulty red cartridge from its white base, and insert a new, compatible QLWAHK SPD cartridge. Restore power and verify the new cartridge shows a GREEN indicator. If the entire device (base and cartridge) is damaged, the complete unit must be replaced.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Indicator is RED | SPD has absorbed a surge and is no longer functional. | Disconnect power, replace the faulty red protective cartridge or the entire SPD unit. Restore power and verify the new unit shows GREEN. |
| Indicator does not light up (no color) | No power to the SPD or internal fault. | Verify power supply to the SPD. Check wiring connections. If power is present and wiring is correct, the SPD may be faulty and requires replacement. |
| Frequent RED indicator | System is experiencing frequent or severe surges. | Consult a qualified electrician to assess the electrical system and identify the source of surges. Additional surge protection or system improvements may be necessary. |
9. Warranty and Support
For warranty information and technical support, please refer to the documentation provided at the time of purchase or contact your vendor. Keep your purchase receipt as proof of purchase.
Manufacturer: QLWAHK
Model Number: QLWAHK SPD