1. Product Overview
The GEYA GRB8-01 and GRB8-02 are Din rail mountable twilight switches designed for automatic control of lighting based on ambient light intensity. These photoelectric timer relays are ideal for applications such as street illumination, garden lights, and advertising displays, ensuring lights are switched ON or OFF according to preset light levels.
Key Features:
- Automatic light control based on ambient light.
- External light sensor for precise monitoring.
- Universal supply voltage: AC 110V-240V.
- Output: 1SPST 16A/AC1.
- Visual indicators: Green LED for supply, Red LED for relay status.
- Compact 1-MODULE design for DIN rail mounting.
- GRB8-02 model includes Zero-Crossing Protection and wider illumination range options.
Figure 1: GEYA GRB8-02 Twilight Switch with external sensor.
Figure 2: GEYA GRB8-01 Twilight Switch with external sensor.
2. Specifications
General Specifications
| Attribute | Value |
|---|---|
| Brand Name | GEYA |
| Model Number | GRB8-01/02 Twilight Switch |
| Power Source | AC |
| Theory | Time Relay |
| Contact Load | Low Power |
| Voltage | AC110V-240V |
| Rated Current | 16A |
| Rated Frequency | 50/60Hz |
| Output Contact | 1SPST |
| Delay Time | 2min |
| Function | Light Sensor |
| Protect Feature | Sealed |
| Certification | CE, RoHS |
| Use | General Purpose |
| Origin | Mainland China |
| Customization | Yes |
GRB8-01 Technical Parameters
Figure 3: GRB8-01 Technical Parameters and Panel Diagram.
GRB8-02 Technical Parameters
Figure 4: GRB8-02 Technical Parameters and Panel Diagram.
Dimensions
Figure 5: Dimensions for GRB8-01 and GRB8-02 models.
3. Setup and Installation
The GEYA GRB8 series twilight switches are designed for DIN rail mounting. Ensure all power is disconnected before installation.
Wiring Diagram
Figure 6: GRB8-01 Wiring Diagram and Example Application.
Figure 7: GRB8-02 Wiring Diagram and Example Application.
Wiring Steps:
- Mount the twilight switch onto a DIN rail.
- Connect the Line (L) and Neutral (N) power supply to the designated terminals (L and N).
- Connect the load (e.g., lamp) to the output terminals (typically 3 and 4).
- Connect the external light sensor (PLS-01) to the sensor input terminals (IN, IN).
- Ensure all connections are secure and comply with local electrical codes. The maximum cable size for solid wire is 1x2.5mm² or 2x1.5mm² (with sleeve). The tightening torque is 0.8Nm.
Sensor Installation
The external light sensor (PLS-01) can be fixed by a panel or by a snap mechanism. Ensure the sensor is placed in a location that accurately reflects the ambient light conditions you wish to monitor, away from direct artificial light sources that could interfere with its operation.
Figure 8: External Light Sensor PLS-01.
The standard sensor cable length is 20cm. It can be extended up to a maximum of 50 meters using standard wire.
4. Operating Instructions
Function Mode Switch
Both GRB8-01 and GRB8-02 models feature a function mode switch on the front panel:
- GRB8-01: ON - AUTO - OFF
- GRB8-02: ON - X1 - X10 - OFF
Mode Descriptions:
- ON: The output relay is continuously ON, regardless of ambient light.
- OFF: The output relay is continuously OFF, regardless of ambient light.
- AUTO (GRB8-01) / X1 / X10 (GRB8-02): The device operates in automatic mode, controlling the load based on the detected ambient light level and the set illumination threshold.
Illumination Setting (Lx)
Use the rotary knob on the front panel to set the desired illumination threshold (Lx) at which the device should switch the load. The range varies by model:
- GRB8-01: 1-100 Lx
- GRB8-02: 1-1000 Lx (when set to X1) or 10-10000 Lx (when set to X10)
The device has a built-in 2-minute delay time to prevent false switching due to momentary light changes (e.g., car headlights, lightning).
Indicators
- Green LED (Un): Indicates that the power supply is connected.
- Red LED (R): Indicates the status of the output relay (ON/OFF).
5. Maintenance
- Regularly inspect the device and wiring for any signs of damage or loose connections.
- Ensure the light sensor lens is clean and free from obstructions (dirt, dust, leaves) to maintain accurate light detection.
- No user-serviceable parts inside. For any malfunctions, contact qualified personnel.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not powering on (Green LED OFF) | No power supply or incorrect wiring. | Check power connections (L and N) and ensure power is supplied. |
| Lights not switching ON/OFF automatically | Incorrect function mode, illumination setting, or faulty sensor. | Ensure the function mode is set to AUTO (GRB8-01) or X1/X10 (GRB8-02). Adjust the illumination setting. Check the sensor for damage or obstruction. |
| Lights flicker or switch erratically | Momentary light changes affecting the sensor, or sensor interference. | The device has a 2-minute delay to prevent this. If persistent, reposition the sensor away from intermittent light sources. |
| Load not receiving power (Red LED ON, but load OFF) | Faulty load or incorrect load wiring. | Check the load (e.g., bulb) and its connections to the output terminals. |
7. User Tips
- Sensor Placement: For optimal performance, position the external light sensor in an area that receives natural ambient light representative of the conditions you want to monitor. Avoid placing it under eaves, near artificial light sources, or in direct sunlight if you want it to react to general twilight.
- Cable Extension: If the provided 20cm sensor cable is too short, it can be extended up to 50 meters using standard electrical wire. Ensure proper gauge and insulation for the extended length.
- Zero-Crossing Protection (GRB8-02): The GRB8-02 model features zero-crossing protection, which helps to extend the life of the relay contacts and the connected load, especially with inductive loads.
8. Warranty and Support
GEYA products are certified to required industry standards, including CE and RoHS. For technical support, warranty claims, or service inquiries, please contact your local distributor or GEYA customer service. Refer to the official GEYA website for the most up-to-date contact information.
Video 1: GEYA Company Introduction and Manufacturing Process.
