Q: How to configure a scenario on the LEGRAND 845 27 switch?

Configuring a scenario on the LEGRAND 845 27 is done through a three-step learning procedure: Configuration procedure: Initiate learning: Press the learning button on the LEGRAND 845 27 (the main switch, or "leader") Add the actors: Once in learning mode, press the learning buttons of each shutter/blind you wish to synchronize with this scenario Validate the scenario: Press the learning button on the 845 27 again to save the scenario Once configured, the three buttons on the switch (Up, Stop, Down) will control all the registered shutters in a synchronized manner. You can also modify existing scenarios, delete specific commands, or reset the device by holding the learning button down for about 5 seconds. The LEGRAND 845 27 also accepts external signals via its E1 and E2 inputs (twilight sensors, wind/sun safety controls, timers) to enhance your scenarios.

Question 1

What does the flashing light indicator mean?

Accepted Answer

The flashing blue light on the KEOR MULTIPLUG 800VA indicates that the UPS is operating on battery. Its flashing frequency informs you of the charge status:

Flashing every 3 seconds - The battery has a charge between 40% and 100% (normal situation during a power outage)
Flashing every 2 seconds - The battery has dropped below 20% charge. The inverter also emits a beep every 2 seconds to alert you

If you see a red light instead, it indicates an overload in normal mode or an inverter error - refer to the diagnostic section of your manual for more details.

During startup, the blue and red lights illuminate together for 3 seconds with a corresponding sound signal, this is normal behavior.

Question 2

My inverter suddenly turns off without switching to battery mode - how can I resolve this issue?

Accepted Answer

This symptom generally indicates that the device is unable to maintain the mains power. Here’s how to diagnose and resolve the issue:

1. Check and replace the fuse

This is the most common cause of sudden shutdown. Your inverter uses a T5AL250V fuse located in the compartment near the power input.

Unplug the device
Locate and inspect the fuse
If the filament is broken, replace it with an identical T5AL250V fuse
Plug it back in and test

2. Check the mains voltage

The inverter operates correctly between 170 V and 280 V. If your mains voltage is outside this range, the device will shut down immediately instead of switching to battery.

Use a multimeter to measure the voltage at your outlet
Test the inverter on another outlet or electrical circuit
If the voltage is unstable or incorrect, contact your electricity supplier

3. Check the red LED indicator

If the red light is steadily on during shutdown, this indicates an internal error. In this case, the inverter cannot operate correctly and requires repair or replacement.

4. Check for overload

If your load exceeds 120% of the rated power (600 VA), the inverter will shut down after 5 seconds without switching to battery. Reduce the connected load and restart the device.

If the problem persists after these checks, there is likely an internal fault in the mains detection circuit. Contact Legrand technical support.

Question 3

How to configure a scenario on the LEGRAND 845 27 switch?

Accepted Answer

Configuring a scenario on the LEGRAND 845 27 is done through a three-step learning procedure:

Configuration procedure:

Initiate learning: Press the learning button on the LEGRAND 845 27 (the main switch, or "leader")
Add the actors: Once in learning mode, press the learning buttons of each shutter/blind you wish to synchronize with this scenario
Validate the scenario: Press the learning button on the 845 27 again to save the scenario

Once configured, the three buttons on the switch (Up, Stop, Down) will control all the registered shutters in a synchronized manner. You can also modify existing scenarios, delete specific commands, or reset the device by holding the learning button down for about 5 seconds.

The LEGRAND 845 27 also accepts external signals via its E1 and E2 inputs (twilight sensors, wind/sun safety controls, timers) to enhance your scenarios.

Question 4

Why does my LEGRAND 845 27 switch operate randomly and not always control the same shutters?

Accepted Answer

A LEGRAND 845 27 switch that operates randomly and does not always control the same shutters may be due to several causes. Here are the points to check and possible solutions:

1. Checking electrical connections

Ensure that all connections of the switch and the roller shutters are tight and free of corrosion. Loose or poorly connected wires can cause erratic operation.

2. Checking the shutter controls

Test each shutter individually to see if it responds correctly to the command. This helps identify if the problem comes from a specific shutter or the switch itself.

3. Electrical or electronic interference

Interference from other electronic devices or nearby electrical installations can disrupt the control signal. Try moving away or temporarily turning off other devices to see if the problem persists.

4. Capacity and load supported

Check that the total load of the controlled shutters does not exceed the maximum capacity supported by the LEGRAND 845 27 switch. An overload can lead to random operation.

5. Resetting the switch

If the switch has a reset function, perform it to return to factory settings. This can correct configuration errors or temporary bugs.

6. Wear or hardware failure

If after all these checks the problem persists, it is possible that the switch is defective or worn. In this case, replacement or technical intervention may be necessary.

By following these steps, you can diagnose and potentially resolve the random operation issue of your LEGRAND 845 27 switch.

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