1. Introduction
The GEYA GRT8-EC Dual Function Time Relay is designed for precise timing control in various industrial and domestic applications. This device offers both "on Delay" and "off Delay" functions, making it versatile for controlling industrial equipment, lighting systems, heating elements, motors, and fans. Its compact 1-MODULE (18mm) design allows for convenient DIN rail mounting.
2. Specifications
| Feature | Specification |
|---|---|
| Product Name | GRT8-EC Dual-function Time Relay |
| Brand Name | GEYA |
| Model Number | GRT8-EC |
| Theory | Time Relay |
| Function | On Delay or Off Delay Timer |
| Power Source | AC |
| Voltage Options | AC220V/DC24V, AC380V, or AC/DC24V~240V |
| Rated Current | 10A (AC1) |
| Output Contact | 1SPDT (1NO1NC) |
| Rated Frequency | 50/60Hz |
| Time Range | 0.1s - 10 days (8 ranges) |
| Contact Load | Low Power |
| Protect Feature | Sealed |
| Mounting | 1-MODULE 18mm, DIN rail mounting |
| Certification | CE, RoHS, CB |
3. Setup and Wiring
The GRT8-EC time relay is designed for DIN rail mounting. Ensure proper power supply and load connections as per the wiring diagrams provided below. Always disconnect power before installation or maintenance.
3.1 Terminal Connections:
- A1, A2, A3: Supply voltage terminals.
- 15, 16, 18: Output contact terminals (15 is common, 16 is NC, 18 is NO).
3.2 Wiring Diagrams:
Refer to Figure 3 for specific wiring configurations based on your model (GRT8-EC/A220 or GRT8-EC/A380). Ensure all connections are secure and comply with local electrical codes.
4. Operating Instructions
The GRT8-EC offers two primary functions: "Delay on" and "Delay off". The delay range and function mode are set using switches and a potentiometer on the front panel.
4.1 Panel Indicators:
- Un (Green LED): Supply indication. Lights up when power is supplied.
- R (Red LED): Output indication. Lights up when the output contact is closed.
4.2 Function Setting:
Use the "Delay on" / "Delay off" switch (T) on the panel to select the desired function.
- Delay on: When the relay Un is powered on, the relay starts to delay. The output contact closes after the set delay time. When Un is powered off, the output contact is disconnected immediately.
- Delay off: When the relay Un is powered on, the output contact of the relay will close immediately and start to delay. The contact is open after the set delay time. If the delay time 't' is not up prior to the power loss of relay Un, the output contact is open.
4.3 Delay Setting:
- Set the delay range and function mode using the switches on the panel. The available time ranges are:
- 0.1s - 1s
- 1s - 10s
- 0.1min - 1min
- 1min - 10min
- 0.1h - 1h
- 1h - 10h
- 0.1d - 1d
- 1d - 10 days
- Set the potentiometer (red dial) to adjust the time within the selected range (0-100%).
Example 1: Setting "Delay on" for 5 seconds
- Set the function switch to "Delay on".
- Set the delay range switch to "1s~10s".
- Set the potentiometer to 50%. The delay time will be 10 seconds × 50% = 5 seconds.
Example 2: Setting "Delay off" for 10 minutes
- Set the function switch to "Delay off".
- Set the delay range switch to "1min~10min".
- Set the potentiometer to 100%. The delay time will be 10 minutes × 100% = 10 minutes.
5. Maintenance
The GEYA GRT8-EC time relay is designed for reliable, long-term operation with minimal maintenance.
- Cleaning: Keep the device clean and free from dust and debris. Use a dry, soft cloth for cleaning. Do not use abrasive cleaners or solvents.
- Inspection: Periodically inspect the terminals for secure connections. Ensure there are no signs of overheating or damage to the casing.
- Environment: Ensure the operating environment is within the specified temperature and humidity ranges to prevent malfunction.
6. Troubleshooting
If you encounter issues with your GRT8-EC time relay, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not powering on (Green LED off) | No power supply or incorrect voltage. Loose wiring. | Check power supply to A1/A2/A3 terminals. Verify voltage matches device rating. Secure all wiring connections. |
| Output not switching (Red LED off/on incorrectly) | Incorrect function setting. Incorrect time setting. Faulty load. | Verify "Delay on" or "Delay off" function is correctly selected. Adjust time range and potentiometer. Test the connected load independently. |
| Inconsistent timing | Unstable power supply. Environmental factors (temperature). | Ensure stable power input. Check operating environment conditions against specifications. |
| Device overheating | Overload on output contacts. Poor ventilation. | Ensure load current does not exceed 10A. Provide adequate ventilation around the device. |
If the problem persists after attempting these solutions, contact GEYA customer support or a qualified electrician.
7. User Tips
- For critical applications, always test the relay's timing accuracy before full deployment.
- When setting the delay, start with a shorter time range and gradually increase it to fine-tune the desired delay.
- Consider using a protective enclosure for the relay in harsh industrial environments to extend its lifespan.
8. Warranty and Support
GEYA products are manufactured to high-quality standards and come with relevant certifications (CE, RoHS, CB). For warranty information, technical support, or service inquiries, please refer to the official GEYA website or contact your local distributor. Keep your purchase receipt for warranty claims.
GEYA is committed to providing reliable electrical products and excellent customer service. They offer a wide range of low voltage electrical and automatic controlling products, including MCB, MCCB, ELCB, Isolators, contactors, relays, timers, VFDs, distribution boards, and related components.
