1. Introduction
Thank you for choosing the EARU Multifunction Time Delay Relay. This device is designed for various timing control applications in industrial and home automation systems. It offers a wide voltage range, multiple timing functions, and easy DIN rail mounting. Please read this manual carefully before installation and operation to ensure safe and correct usage.
2. Safety Instructions
- Installation and maintenance should only be performed by qualified personnel.
- Ensure the power supply is disconnected before any wiring or maintenance.
- Verify that the voltage and current ratings of the relay match your application requirements.
- Do not operate the device in environments exceeding its specified operating temperature or pollution degree.
- Protect the device from moisture, dust, and corrosive gases.
3. Technical Specifications
| Attribute | Value |
|---|---|
| Brand Name | EARU |
| Model Number | EAMT1-M1, EAMT1-M2 |
| Theory | Time Relay |
| Power Source | AC/DC 12-240V (50/60Hz) |
| Rated Current | 16A |
| Use | General Purpose |
| Certification | CE |
| Origin | Mainland China |
| Time Range | 0.1s - 10 days |
| Output Contact | EAMT1-M1: 1NO1NC, EAMT1-M2: 2NO2NC |
| Mechanical Life | 10 million times |
| Electrical Life (AC1) | 100,000 times |
| Time Setting | Potentiometer |
| Tightening Torque | 0.4Nm |
| Operating Temperature | -20°C to +55°C (-4°F to 131°F) |
| Reset Time | 200ms max. |
| Pollution Degree | 2 |
4. Installation
The EARU Time Delay Relay is designed for DIN rail mounting. Ensure secure fastening to prevent accidental dislodgement.
4.1. Terminal Overview
- A1(+), A2(-): Supply Terminals (Input Voltage Us)
- S: Trigger Terminal
- R: Output Contact (LED Indication: RED=Output, GREEN=Supply)
- EAMT1-M1 (1NO1NC): Contacts 15-18 (NO), 15-16 (NC)
- EAMT1-M2 (2NO2NC): Contacts 25-28 (NO), 25-26 (NC) for Group 1; Contacts 15-18 (NO), 15-16 (NC) for Group 2
4.2. Wiring Diagrams
Always ensure correct polarity for DC connections and proper phase for AC connections. Use appropriate wire gauges for the rated current.
5. Operation
The EARU Time Delay Relay features three adjustable potentiometers for setting the time range, time percentage, and function selection.
- Time Range Selection (Us dial): Select the desired time base (e.g., 1s, 10s, 1m, 10m, 1h, 10h, 1d, 10d).
- Time Percentage Setting (%): Adjust the percentage of the selected time range for precise timing.
- Function Selection (A-J dial): Choose one of the 10 available timing functions.
The red LED (R) indicates the output contact status, and the green LED (Us) indicates the supply status.
5.1. Function Descriptions
The relay offers 10 distinct timing functions, labeled A through J. Refer to the function selection dial on the device and the descriptions below:
- A: On Delay (Power On): When input voltage U is applied, timing delay t begins. Relay contacts R change state after time delay is complete. Contacts R return to their shelf state when input voltage U is removed. The trigger switch is not used in this function.
- B: Interval (Power On): When input voltage U is applied, relay contacts R change state immediately and the timing cycle begins. When time delay is complete, contacts return to shelf state. When input voltage U is removed, contacts will also return to their shelf state. The trigger switch is not used in this function.
- C: Repeat Cycle (Starting Off): When input voltage U is applied, time delay t begins. When time delay t is complete, relay contacts R change state for time delay t. This cycle will repeat until input voltage U is removed. The trigger switch is not used in this function.
- D: Repeat Cycle (Starting On): When input voltage U is applied, relay contacts R change state immediately and time delay t begins. When time delay t is complete, contacts return to their shelf state for time delay t. This cycle will repeat until input voltage U is removed. The trigger switch is not used in this function.
- E: Off Delay (S Break): Input voltage U must be applied continuously. When trigger switch S is closed, relay contacts R change state. When trigger switch S is opened, delay t begins. When delay t is complete, contacts R return to their shelf state. If trigger switch S is closed before time delay t is complete, then time is reset. When trigger switch S is opened, the delay begins again, and relay contacts R remain in their energized state. If input voltage U is removed, relay contacts R return to their shelf state.
- F: Single Shot: Upon application of input voltage U, the relay is ready to accept trigger signal S. Upon application of the trigger signal S, the relay contacts R transfer and the preset time t begins. During time-out, the trigger signal S is ignored. The relay resets by applying the trigger switch S when the relay is not energized.
- G: Single Shot Trailing Edge (Non-Retriggerable): Upon application of input voltage U, the relay is ready to accept trigger signal S. Upon application of the trigger signal S, the relay contacts R transfer and the preset time t begins. At the end of the preset time t, the relay contacts R return to their normal condition unless the trigger switch S is opened and closed prior to time out t (before preset time elapses). Continuous cycling of the trigger switch S at a rate faster than the preset time will cause the relay contacts R to remain closed. If input voltage U is removed, relay contacts R return to their shelf state.
- H: On/Off Delay: Input voltage U must be applied continuously. When trigger switch S is closed, time delay t begins. When the time delay t is complete, relay contacts R change state and remain transferred until trigger switch S is opened. If input voltage U is removed, relay contacts R return to their shelf state.
- I: Latching Relay: Input voltage U must be applied continuously. Output changes state with every trigger switch S closure. If input voltage U is removed, relay contacts R return to their shelf state.
- J: Pulse Generator: Upon application of input voltage U, a single output pulse of 0.5 seconds is delivered to the relay after time delay t. Power must be removed and re-applied to repeat the pulse. The trigger switch is not used in this function.
6. Maintenance
- Regularly inspect wiring connections for tightness and signs of wear or damage.
- Keep the device clean and free from dust and debris.
- Ensure proper ventilation around the device to prevent overheating.
- Do not attempt to open or repair the device yourself. Contact qualified service personnel if a malfunction occurs.
7. Troubleshooting
- Relay not activating/deactivating: Check power supply (Us LED), wiring connections, and ensure the selected function and time settings are correct.
- Inconsistent timing: Verify stable power supply and ensure the time range and percentage dials are set accurately.
- Device not responding to trigger: Check the trigger switch (S terminal) wiring and functionality. Ensure the selected function requires a trigger.
- Overheating: Ensure the load current does not exceed the rated current (16A) and that there is adequate ventilation.
8. User Tips
No specific user tips were available from reviews or Q&A for this product. However, general tips for using time delay relays include:
- Always test your setup with a non-critical load before deploying it in a live application.
- For critical applications, consider using a backup or fail-safe mechanism.
- Label your wiring clearly to simplify future maintenance or modifications.
9. Warranty and Support
For warranty information and technical support, please refer to the product packaging or contact your retailer. Keep your purchase receipt as proof of purchase.
