Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Legrand Analog Daily Timer, Model 3740. This device is designed for programmable switching of electrical circuits, offering intelligent control over connected appliances or lighting.
Please read this manual thoroughly before installation and use to ensure safe and efficient operation.
Safety Information
- Installation must be performed by a qualified electrician in accordance with local wiring regulations.
- Disconnect power at the main circuit breaker before performing any installation or maintenance.
- Do not expose the device to moisture or extreme temperatures.
- Ensure proper grounding where required.
- Do not attempt to open or repair the device yourself. Refer to qualified personnel.
Product Overview
The Legrand Analog Daily Timer 3740 is a compact, DIN rail mountable device. It features a mechanical dial for setting daily programs and clear terminal markings for easy wiring.
Figure 1: Front view of the Legrand Analog Daily Timer 3740. Note the time dial, input/output terminals (L, N, M, 1, 4), and specifications printed on the side.
Key Components:
- Time Dial: Rotatable dial with 24-hour markings for setting the current time and programming ON/OFF periods.
- Programming Segments/Pins: Small segments around the dial that can be pushed in or pulled out to set switching times. Each segment typically represents a 15 or 30-minute interval.
- Manual Override Switch: (If present, usually a small lever or button) Allows temporary manual control of the output regardless of the timer program.
- Terminal Connections: L (Line), N (Neutral), M (Motor/Load), 1 (Common), 4 (Normally Open output).
- DIN Rail Clip: For secure mounting on a standard DIN rail.
Setup and Installation
1. Mounting:
- Ensure power is disconnected at the main supply.
- Attach the timer securely to a standard 35mm DIN rail within an electrical enclosure.
2. Wiring:
Refer to the wiring diagram printed on the device and below. Use appropriate wire gauges for the 16A rating.
- Connect the incoming Line (L) conductor to the terminal marked 'L'.
- Connect the incoming Neutral (N) conductor to the terminal marked 'N'.
- Connect the Common (1) terminal to the Line (L) if switching a live load, or to Neutral (N) if switching a neutral load.
- Connect the Load (4) terminal to the device you wish to control (e.g., light, fan). The other side of the load should be connected to Neutral (N).
- The 'M' terminal is typically for the internal motor of the timer and should be connected to the Neutral (N) if not internally connected. Consult specific product diagrams if unsure.
3. Initial Time Setting:
- Rotate the time dial clockwise until the current time aligns with the small arrow or marker on the timer's body.
- If the timer has a power reserve (not indicated for this model), it will maintain time during power outages. Otherwise, it will stop during power loss and need resetting.
Operating Instructions
Programming ON/OFF Times:
The time dial is surrounded by small segments. Each segment represents a specific time interval (e.g., 15 minutes). To program:
- To set an ON period: Push the segments inwards for the desired duration.
- To set an OFF period: Pull the segments outwards for the desired duration.
- The timer will switch the connected load ON when the dial reaches an "in" segment and OFF when it reaches an "out" segment.
- Ensure the current time is accurately set for the program to function correctly.
Manual Override (if applicable):
Some models include a manual override switch. This allows you to temporarily switch the connected load ON or OFF, overriding the programmed schedule. The timer will revert to its programmed schedule at the next programmed switching point.
Maintenance
- The Legrand Analog Daily Timer 3740 requires minimal maintenance.
- Periodically clean the exterior with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Ensure all terminal connections remain secure. Re-tighten if necessary, with power disconnected.
- This model does not require batteries for operation or timekeeping.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Timer not switching load ON/OFF. | No power supply; Incorrect wiring; Programming segments not set correctly; Manual override engaged. | Check power supply; Verify wiring against diagram; Ensure segments are pushed/pulled correctly; Check manual override switch position. |
| Timer dial not moving. | No power supply to timer motor. | Check power supply to L and N terminals. |
| Load remains ON/OFF constantly. | Manual override engaged; All segments pushed in/pulled out; Faulty unit. | Disengage manual override; Re-program segments; If problem persists, consult a qualified technician. |
Specifications
| Feature | Detail |
|---|---|
| Brand | Legrand |
| Model Number | 003740 |
| Type | Analog Daily Timer |
| Voltage | 230 V |
| Frequency | 50/60 Hz |
| Current Rating | 16 A |
| Material | ABS |
| Dimensions (approx.) | 9.8 x 8.4 x 2.4 cm |
| Weight | 80 g |
| Mounting | DIN Rail |
Warranty Information
Legrand products are manufactured to high quality standards. For specific warranty terms and conditions, please refer to the documentation provided with your purchase or visit the official Legrand website. Keep your proof of purchase for warranty claims.
Customer Support
If you encounter any issues not covered in this manual or require further assistance, please contact Legrand customer support. Contact details can typically be found on the Legrand official website or on your product packaging.
For more information, visit: www.legrand.com
