1. Introduction
The EARUELETRIC EASP-PV series DC Surge Protective Device (SPD) is designed to safeguard electrical systems and connected electrical apparatus from damage caused by thunder and instantaneous over-voltage events. This device is crucial for maintaining the integrity and longevity of photovoltaic (PV) solar installations by diverting harmful surge currents away from sensitive equipment. This manual provides essential information for the safe installation, operation, and maintenance of your SPD.
Figure 1: EASP-PV Series SPD Models (500V, 800V, 1000V)
2. Safety Information
- Installation and maintenance should only be performed by qualified personnel.
- Ensure the power supply is completely disconnected before any installation or maintenance work.
- Always use appropriate personal protective equipment (PPE) when working with electrical systems.
- Verify that the SPD's voltage and current ratings match your PV system's requirements.
- Do not operate the device if it shows signs of damage or malfunction.
- Proper grounding is essential for effective surge protection.
3. Product Overview
3.1 Components and Features
Figure 2: SPD Component Diagram
- Input - (DC+) / Input + (DC-): Terminals for connecting to the DC power lines.
- Brand (EARU): Manufacturer's identification.
- T2: Indicates the surge protective device type.
- Indicator Windows: Visual status display.
- Model Number (EASP-PV-500, EASP-PV-800, EASP-PV-1000): Specific product model.
- Rated Voltage (Uc): Maximum continuous operating DC voltage (500VDC, 800VDC, 1000VDC).
- Maximum Discharge Current (Imax): Peak current the device can safely discharge (40KA/60KA).
- Nominal Discharge Current (In): Current at which the device is tested (20KA/30KA).
- Voltage Protection Level (Up): Residual voltage across the SPD when discharging (≤ 2.5kV).
- CE: Conforms to European safety standards.
- Standard (IEC61643-1): Complies with international standards for SPDs.
- Ground Wire End: Terminal for connecting to the system's ground.
3.2 Visual Indicator Window
The SPD features a visual indicator window to reflect its working state:
Figure 3: Indicator Window Status
- Green: Indicates normal operation. The SPD is functioning correctly.
- Red: Indicates a fault status. The SPD has absorbed a significant surge and needs replacement.
4. Specifications
Figure 4: Product Dimensions and Parameters
| Parameter | Value |
|---|---|
| Product Name | Lightning Protection Device |
| Product Function | Lightning Protection |
| Product Material | PC flame retardant shell |
| Mounting | 35mm Rail Mounting (Symmetrical rail EN50022/DIN46277-3) |
| Nominal Discharge Current (In) | 20KA/30KA |
| Maximum Discharge Current (Imax) | 40KA/60KA |
| Input Voltage (Uc) | DC 500V/800V/1000V |
| Voltage Protective Level (Up) | ≤2.2kV (at In) |
| Degree of Protection | IP20 |
| Certification | CE |
| Poles Number | 2P, 3P |
| Operation Temperature Range | -40°C to +85°C |
| Housing Material | UL94V0 |
| Disconnection Indicator | Mechanical indicator |
| Remote Control Contact | No |
| Color | Gray |
| I/O Connections | By screw terminal: 10-35mm², By connection bus |
| Response Time | ≤25ns |
| Isolation Resistance | >102MΩ |
5. Installation and Setup
5.1 Mounting
The EASP-PV series SPD is designed for 35mm DIN rail mounting. Ensure the mounting location is clean, dry, and free from excessive vibrations. Mount the SPD securely on the DIN rail within an appropriate enclosure to protect it from environmental factors.
Figure 5: SPD Mounted on DIN Rail
5.2 Wiring Diagram
Follow the wiring diagram carefully to ensure correct and safe installation. Incorrect wiring can lead to malfunction or damage to the system.
Figure 6: Typical Wiring Diagram for SPD in a PV System
- Disconnect Power: Before starting any wiring, ensure that all power sources to the PV system are completely disconnected and locked out.
- Connect DC+ and DC- Inputs: Connect the positive (DC+) and negative (DC-) lines from your PV array to the corresponding input terminals on the SPD. The SPD should be installed in parallel with the equipment it protects.
- Ground Connection: Connect the ground wire end of the SPD to the main grounding system of your installation. This connection must be as short and direct as possible to ensure effective surge diversion. Use appropriate wire gauges for all connections (10-35mm² by screw terminal).
- Verify Connections: Double-check all connections for tightness and correct polarity before restoring power.
6. Operation
Once installed and powered, the SPD operates automatically. It continuously monitors the DC voltage in your PV system. In the event of an over-voltage surge (e.g., lightning strike), the SPD will divert the excess energy to the ground, protecting your connected equipment.
The operational status of the SPD is indicated by the visual window:
- Green Indicator: The SPD is functioning normally and providing protection.
- Red Indicator: The SPD has absorbed a surge and is no longer providing protection. It requires immediate replacement.
7. Maintenance
- Regular Inspection: Periodically check the visual indicator window on the SPD. This should be done as part of routine system checks.
- Replacement: If the indicator window turns red, the SPD has reached its end-of-life and must be replaced. Disconnect power before replacing the unit.
- Cleaning: Keep the SPD and its terminals clean and free from dust and debris. Use a dry, soft cloth for cleaning. Do not use liquid cleaners.
- Connection Check: Ensure all wiring connections remain tight and secure. Loose connections can lead to poor performance or safety hazards.
8. Troubleshooting
- SPD Indicator is Red: This indicates the SPD has failed due to an over-voltage event. The unit needs to be replaced. Ensure power is off before replacement.
- System Malfunction After SPD Installation: Double-check all wiring connections for correct polarity and tightness. Ensure the SPD's voltage rating matches your system. If the issue persists, consult a qualified electrician.
- Concern about Fuse Connection: The SPD itself does not typically include an integrated fuse. It is designed to work in conjunction with existing circuit protection (e.g., circuit breakers or fuses) in your electrical system. Ensure your system has appropriate overcurrent protection devices installed upstream of the SPD.
9. User Tips
- Always select an SPD with a voltage rating (Uc) that is equal to or greater than the maximum open-circuit voltage of your PV array.
- Consider the number of poles (2P or 3P) required for your specific DC system configuration.
- For optimal protection, install the SPD as close as possible to the equipment it is protecting.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your seller or the manufacturer directly. Ensure you have your product model (EASP-PV) and purchase details available when contacting support.
This product is CE certified, indicating compliance with relevant European health, safety, and environmental protection standards.