Introduction
The Legrand MICROREX T31 is an analog programmable timer designed for precise control of electrical circuits. This device is suitable for modular panel or DIN rail mounting and operates on a 230V AC, 50Hz power supply. It features a 24-hour program cycle with 15-minute programmable segments, a manual override switch, and a 60-minute power reserve. This manual provides essential information for the safe installation, operation, and maintenance of your MICROREX T31 timer.
Safety Instructions
- Always disconnect power before installation, maintenance, or troubleshooting to prevent electric shock.
- Installation must be performed by a qualified electrician in accordance with local electrical codes and regulations.
- Do not expose the device to moisture, extreme temperatures, or corrosive environments.
- Ensure all connections are secure and properly insulated.
- The device is rated IP20; protect it from dust and water ingress.
- Do not attempt to open or repair the device yourself. Contact qualified service personnel.
Package Contents
Verify that all components are present and undamaged upon unpacking:
- 1 x Legrand MICROREX T31 Analog Programmable Timer (Model 003752)
- Instruction Manual (this document)
Installation
The MICROREX T31 timer is designed for DIN rail mounting (EN 022 50) or modular panel installation. It occupies 3 modular units of width.
Mounting
- Ensure the main power supply is OFF before mounting.
- Attach the timer securely to a standard DIN rail or integrate it into a modular panel.
- Ensure adequate ventilation around the device.
Wiring
The timer requires a 230V AC, 50Hz power supply. It features a potential-free changeover switching contact with a rated switching current of 16A at 250V AC.
- Connect the phase (L) and neutral (N) wires to the designated power supply terminals.
- Connect the load circuit to the changeover contact terminals (Common, Normally Open, Normally Closed) as required by your application.
- Ensure all connections are tight and correct according to the wiring diagram provided on the device or in the full technical documentation.
- The terminal cover is sealable for added security.
Image: Legrand MICROREX T31 Analog Programmable Timer. This image shows the front view of the timer, highlighting its analog dial and manual switch.
Operation
The MICROREX T31 timer operates on a 24-hour cycle and allows for precise scheduling of connected devices.
Setting the Current Time
- Rotate the central dial (pointer for forward and reverse movement) until the current time aligns with the time marker on the timer's face.
- The dial is designed for light rotation to facilitate setting.
Programming On/Off Times
- The program disc is divided into 15-minute segments. Each segment corresponds to a small pin or tab around the dial.
- To set an 'ON' period, push the corresponding pins outwards. To set an 'OFF' period, leave the pins in their inward position.
- The timer will activate the connected circuit when the dial reaches an 'ON' segment and deactivate it for 'OFF' segments.
Manual Override
- The timer includes a manual switch (handschalter) for temporary override of the programmed schedule.
- Refer to the markings on the timer for the specific positions of the manual override switch (e.g., ON, AUTO, OFF).
Summer/Winter Time Adjustment
- The MICROREX T31 does not feature automatic summer/winter time change.
- Adjust the current time manually by rotating the dial when daylight saving time changes occur.
Power Reserve
- The timer has a power reserve of approximately 60 minutes. This allows the timer to maintain accurate timekeeping during brief power outages.
Maintenance
- Keep the timer clean and free from dust. Use a soft, dry cloth for cleaning.
- Regularly check electrical connections for tightness and signs of wear.
- Ensure the environment remains within the specified operating conditions (IP20 protection).
- No user-serviceable parts inside. Do not disassemble the unit.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Timer not switching load | No power supply; Incorrect wiring; Manual override engaged; Pins not set correctly. | Check power supply; Verify wiring against diagram; Ensure manual switch is in 'AUTO' mode; Re-check program pin settings. |
| Time is inaccurate | Incorrect initial time setting; Prolonged power outage exceeding power reserve. | Reset the current time; Check power supply stability. |
| Pins are difficult to adjust | Normal operation, pins can be stiff. | Use a small, non-conductive tool (e.g., a plastic pen tip) to adjust pins carefully. |
Specifications
| Feature | Specification |
|---|---|
| Model Number | 003752 |
| Brand | Legrand |
| Supply Voltage | 230V AC |
| Frequency | 50 Hz |
| Contact Type | Changeover Switch (Potential-free) |
| Rated Switching Current | 16 A at 250V AC |
| Program Cycle | 24 hours |
| Smallest Programmable Duration | 15 minutes |
| Power Reserve | 60 minutes |
| Mounting Type | DIN Rail (EN 022 50), Modular Panel |
| Width | 3 Modular Units |
| Protection Index | IP20 |
| Material | Metal |
| Color | White |
| Dial Diameter | 52.5 mm |
Warranty and Support
Legrand products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please refer to the official Legrand website or contact your local Legrand distributor. Keep your purchase receipt as proof of purchase.
For further assistance, visit the Legrand Store on Amazon.