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2-Way Lighting with Fibaro - Alternative Wiring Guide



IMPORTANT - Read this first!


This guide relates to the ORIGINAL Fibaro Universal Dimmer.


Do NOT follow this guide if you are installing the Fibaro Universal Dimmer 2.


You can cause damage to the device, your lighting circuit and your lights if you ignore this warning!


For assistance in installing your Fibaro Universal Dimmer 2 devices, please refer to this guide.


This guide provides alternative ways to use a Fibaro Dimmer module in a 2-way lighting system.

Each wiring diagram uses the cables that you will have available - you will not need to install any new cables. For an introduction to using the Fibaro Dimmer in 2-Way lights, take a look at APNT-2 - 2-Way Lighting Using Fibaro Dimmer Modules.

Alternative 2-Way Wiring - Toggle Switches

A standard 2-way lighting circuit is shown in Figure 1.

A 2-core cable (brown and blue) carries the 'Live' and 'Switched Live' to the wall switch and up to the light fitting. An extra 3-core cable (brown, black and grey) connects the two wall switches together; enabling each of them to independently turn the light On or Off.

Note: To simplify these diagrams, we have not shown the earth cables - but all circuits MUST have the earth cable correctly installed.

Standard 2-Way Wiring SystemFigure 1: A standard 2-Way Wiring System.

In APNT-2 - 2-Way Lighting Using Fibaro Dimmer Modules we show the most common way to install the Fibaro Dimmer into this wiring scheme. However, some people will want to install the Dimmer in the second switch (Switch B).

2-Way Lighting with Dimmer in Switch BFigure 2: 2-Way Lighting with Dimmer in Switch B.

Figure 2 shows how to add the Fibaro Dimmer into the second switch (Switch B). This does require some of the cables to be wired to the dimmer rather than the switch, but you will not need to install additional wires. This wiring scheme will work for Toggle switches.

Fibaro Dimmer Parameter Setting:

The following parameters need to be set:

  • 14 - 1 - enables the dimmer to work with a toggle switch (default is 0 for a momentary switch)
  • 17 - 1 - enables the dimmers S2 switch to also control the dimmer (default 0)

3-way Lighting - Toggle Switches

A 3-way lighting circuit is shown in Figure 3. This uses two 2-way switches (as you find in a 2-way circuit), but it also includes an Intermediate Switch that is in the 'middle' of the circuit. All switches are toggle type and each can control the light On/Off.

A 3-Way Lighting System with Intermediate SwitchFigure 3: A 3-Way Lighting System with Intermediate Switch.

The simple way to add the Fibaro Dimmer into this circuit is to use Figure 4. This simply moves the 'Live' and 'Switched Live' cables to the Fibaro Dimmer's 'L' and 'O' terminals and then wires the 'Sx' and 'S1' terminals to the light switch's 'L1' and 'L2' terminals.

You could also use this as yet another way to wire the Fibaro Dimmer into a 2-way lighting system (ignore the Intermediate switch)

Fibaro Dimmer installed in 3-way lighting systemFigure 4: Fibaro Dimmer installed in 3-way lighting system.

Fibaro Dimmer Parameter Setting:

The following parameters need to be set:

  • 14 - 1 - enables the dimmer to work with a toggle switch (default is 0 for a momentary switch)
  • 17 - 1 - enables the dimmers S2 switch to also control the dimmer (default 0)

2-way Lighting with alternative 2-wire System

This is a relatively new style of creating a 2-way lighting circuit. It is still uncommon in most buildings.

A 2-Way Lighting System using 2 wires between switchesFigure 5: A 2-Way Lighting System using 2 wires between switches.

This system uses a 2-core (+ earth) cable between the two switches, instead of the more typical 3-core (+ earth) cable. You can install the Fibaro Dimmer in this circuit by using Figure 6 as a guide. In this circuit you MUST use Momentary Switches.

Fibaro Dimmer installed in a 2-wire 2-way systemFigure 6: Fibaro Dimmer installed in a 2-wire 2-way system.

Fibaro Dimmer Parameter Setting:

The following parameters need to be set:

  • 14 - 0 - keep as default to work with momentary switch
  • 17 - 0 - keep as default

Ceiling Installation

This circuit is the standard one shown in Figure 1, but looking at the ceiling wiring rather than the switch wiring.

Standard 2-Way Wiring SystemFigure 7: A standard 2-Way Wiring System (Ceiling View).

When installing the dimmer in the ceiling you can largely ignore the switch wiring in this type of circuit. This is because it doesn't matter if the switches are wired as 1-way, 2-way, or 3-way with intermediate - the two wires that come from the switches to the light fitting are just Live and Switched Live. So we use these wires to control the dimmer. This is actually the same wiring used in Figure 4, but in the ceiling rather than at the switch (and making use of neutral as it is available).

Standard 2-Way Wiring SystemFigure 8: Fibaro Dimmer wired in the Ceiling - Standard multi-way circuit.

Fibaro Dimmer Parameter Setting:

The following parameters need to be set:

  • 14 - 0 or 1 - depending if you wish to use momentary (0) or toggle (1) switches
  • 17 - 0 - keep as default

Star Circuit

This is another ceiling installation circuit. This uses a 'star' formation where all switch wires are taken to a junction box in the ceiling and then feed the light. It looks more complicated than the standard circuit but is still straightforward to wire.

Standard 2-Way Wiring SystemFigure 9: Star 2-way lighting circuit (Ceiling View).

The Fibaro Dimmer can be installed in a 'Star' 2-way circuit by following Figure 10

Standard 2-Way Wiring SystemFigure 10: Fibaro Dimmer wired into a Star circuit.

Fibaro Dimmer Parameter Setting:

The following parameters need to be set:

  • 14 - 0 or 1 - depending if you wish to use momentary (0) or toggle (1) switches
  • 17 - 0 - keep as default

Earthing

All electrical circuits MUST be correctly Earthed.

All cables used in lighting circuits contain a bare Earth wire - this typically has a green/yellow sleeve when it is wired to the switch or backbox. The Earth is a very important part of the electrical system and all switches, appliances and lights must be correctly earthed.

For simplicity we do not show the earth wire in these drawings or explanations as it plays no active role in the day-to-day workings of your light circuits, it is there for your protection in case of emergency.

Disclaimer:

Installing the Fibaro Dimmer modules involve working with 240V mains wiring. If you are not comfortable doing this you should consult a qualified electrician. This application note is provided as a guide, all work is are carried out at your own risk. Vesternet do not accept any responsibility or liability.

Related Information


 

Copyright Vesternet 2016

Updated: 31/03/2016

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