EARU Multifunction Time Relay Instruction Manual

1. Introduction

The EARU Multifunction Time Relay is a versatile device designed for various timing control applications in industrial and home automation. It offers 10 selectable functions, wide voltage compatibility (AC/DC 12V-240V), and a broad time range from 0.1 seconds to 10 days. Its compact DIN rail design ensures easy installation in control panels.

2. Specifications

Below are the technical specifications for the EARU Multifunction Time Relay:

3. Key Features

• Multifunctionality: 10 integrated timing modes (A-J) for diverse applications.
• Wide Voltage Range: Compatible with AC/DC 12V-240V power supplies.
• Adjustable Time Range: Precise timing from 0.1 seconds up to 10 days.
• High Current Capacity: Rated for up to 16A.
• DIN Rail Mounting: Easy and secure installation in standard electrical enclosures.
• Visual Indicators: Green LED for supply indication (Us), Red LED for output indication (R).
• Robust Design: High mechanical and electrical life for long-term reliability.

4. Installation and Wiring

4.1. Mounting

The EARU Time Relay is designed for DIN rail mounting. Simply clip the device onto a standard 35mm DIN rail in your control panel.

4.2. Wiring Diagram (EAMT1-M1 Example)

Refer to the diagram below for typical wiring connections. Ensure all connections are secure and comply with local electrical codes.

4.3. Terminal Descriptions

Identify the terminals on your time relay as shown in the image below:

• A1(+), A2(-): Working power input terminals.
• S: Trigger terminal.
• Us (Green LED): Supply indication.
• R (Red LED): Output indication.
• 15, 16, 18: First set of conversion contacts (15-18 Normally Open, 15-16 Normally Closed).
• 25, 26, 28: Second group of conversion contacts (EAMT1-M2 only).

5. Operation

5.1. Setting Delay Time

The time relay features two rotary knobs for setting the delay time:

1. Knob 1 (Top): Delay gear setting. Select 's' for seconds, 'm' for minutes, 'h' for hours, 'd' for days. 'ON' for relay action, 'OFF' for relay open (15-18/25-28 open).
2. Knob 2 (Middle): Fine adjustment of delay time, 10% to 100% adjustable.

Delay Time Calculation: Delay time = Knob 1 setting × Knob 2 percentage.

• Example 1: To set for 5 seconds, set Knob 1 to '10s', Knob 2 to '50%'. Delay time = 10s × 50% = 5s.
• Example 2: To set for 8 minutes, set Knob 1 to '10m', Knob 2 to '80%'. Delay time = 10m × 80% = 8m.

5.2. Function Selection

The bottom knob allows you to select one of the 10 available delay modes (A-J). Refer to the 'Functions Diagram' and descriptions below for details on each mode.

5.3. Function Descriptions

A: On Delay (Power On)

When the 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. 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 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. 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. 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. 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. If trigger switch S is closed before time delay t is complete, then time is reset. When delay t is complete, contacts R return to their shelf state. 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 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 relay after time delay t. Power must be removed and re-applied to repeat pulse. Trigger switch is not used in this function.

5.4. Function Demonstration Video

Watch this video for a visual demonstration of the various functions and their operation:

6. 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 check wiring connections for tightness and signs of wear or damage.
• Environment: Ensure the operating environment is within the specified temperature and humidity ranges to prevent malfunction.
• No User-Serviceable Parts: The device contains no user-serviceable parts. Do not attempt to open or repair the unit yourself.

7. Troubleshooting

If you encounter issues with your EARU Time Relay, consider the following common problems and solutions:

• Device not powering on (Us LED off):
  - Check the input voltage supply (A1, A2) to ensure it is within the AC/DC 12-240V range.
  - Verify that the power connections are secure.
• Output not switching (R LED off/incorrectly):
  - Confirm the selected function (A-J) and time settings are correct for your application.
  - Check the trigger input (S) if the selected function requires it.
  - Ensure the load connected to the output contacts (15, 16, 18 or 25, 26, 28) is within the 16A rated current.
• Inaccurate timing:
  - Re-check the settings of both time adjustment knobs (gear and percentage).
  - Ensure the power supply is stable and free from significant fluctuations.
• Intermittent operation:
  - Inspect all wiring for loose connections or damaged insulation.
  - Check for electromagnetic interference from nearby equipment.

If the problem persists after checking these points, contact customer support.

8. User Tips

• For critical applications, always test the relay's function and timing accuracy before deploying it in a live system.
• When selecting a time range, choose the smallest range that accommodates your desired delay for better precision.
• Consider using a separate power supply for the control circuit (A1, A2) and the load circuit if the load is inductive or prone to generating electrical noise.
• Label your wiring clearly during installation to simplify future maintenance or troubleshooting.

9. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the seller's official website or contact their customer service directly. Keep your purchase receipt as proof of purchase.