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Standard 2-Way Lighting using Fibaro Dimmer 2

 

 

IMPORTANT - Read this first!

This guide relates to the NEW Fibaro Universal Dimmer 2 module.

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

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

 

One of the things that confuses people the most is installing home automation into an existing 2-Way lighting system. This application note looks at how a Fibaro Dimmer 2 module can be installed to control a 2-way lighting system.

Firstly, what do we mean by 2-way lighting?

This simply refers to a lighting system where one light is controlled by two light switches. Examples of this are where a room has two entrances (each needs a light switch) or for a hall light that can be controlled from the hall and the upstairs landing.

Standard 2-Way Wiring

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

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.

This type of lighting system uses "Toggle" (latching) switches. These latch in position - for instance when you press the switch to On, the switch physically stays in the On position. These are the standard light switches you'll find already fitted in your home.

The Fibaro Dimmer 2 module can also be used with a variety of "Momentary" switch types and configurations. Momentary switches, also known as Retractive or Bell-Push, only remain in the On state while you press them, they return to the Off state when the button is released.

This doesn't mean that you have to keep holding the button to keep the light on. The Dimmer 2's internal controls automatically keep the light on when the button is released.

We can install the Fibaro Dimmer 2 module into the 2-way circuit in various different ways shown below. We've separated out the diagrams based on whether you need to install the module at Switch A or Switch B position.

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

Installation at Switch A position

This is probably the most common of requirements, you will install the Fibaro Dimmer 2 module at the Switch A position where it has access to both the 2-core wire and the 3-core wire.

 

Toggle Switches

To retain your existing standard Toggle switches, we can simple install the Fibaro Dimmer 2 module as shown in Figure 2.

2-Way Wiring with Toggle Switches (Switch A) Figure 2: 2-Way Wiring System using the Fibaro Dimmer 2 with Toggle switches.

In this case we keep the standard Toggle switches; connecting Switch A "L1" to the Dimmer 2's S1 input and Switch B "L1" to the Dimmer 2's S2 input with the "COM" wire connected to the Dimmer 2's Sx output. Any unused wires from the original 3-core between the two switches should be safely terminated.

The Dimmer 2 is then configured to accept S2 as the second switch control of the Dimmer module.

This gives simple On / Off control of the light from the switches but you will still be able to control the dimming level over Z-Wave if required.

 

Fibaro Dimmer 2 Parameter Setting:

The following parameters need to be set:

  • 20 - 1 - enables the dimmer to work with a toggle switch (default is 0 for a momentary switch)
  • 26 - 1 - enables the dimmers S2 switch to also control the dimmer (default 0)

 

Momentary Switches

For full On / Off and dimming control we can replace the Toggle wall switches with similar styled Momentary switches.

 

2-Way Wiring with Momentary Switches (Switch A) Figure 3: 2-Way Wiring System using the Fibaro Dimmer 2 with Momentary switches.

By using Momentary switches, the 2-Way wiring can be simplified - simply connect both Switch A and Switch B "L1" to the Dimmer 2's S1 input and the "COM" wire to the Dimmer 2's Sx output. Any unused wires from the original 3-core between the two switches should be safely terminated.

 

Fibaro Dimmer 2 Parameter Setting:

The following parameters need to be set:

  • 20 - 0 - keep as default to work with a momentary switch
  • 26 - 0 - keep as default

 

Multi-Way install with Momentary Switches

Using the Fibaro Dimmer 2 with Momentary switches enables the easy creation of 3-way lighting circuits, in fact an infinite number of Momentary switches can be wired in parallel to create 3-, 4-, 5-, 6-way... lighting systems.

Multi-Way Wiring with Momentary SwitchesFigure 4: Multi-Way Wiring using the Fibaro Dimmer 2 with Momentary Switches.

Simply add on as many Momentary switches as you require by extending the "L1" and "COM" wires. Any unused wires from the original 3-core between the switches should be safely terminated.

 

Fibaro Dimmer 2 Parameter Setting:

The following parameters need to be set:

  • 20 - 0 - keep as default to work with momentary switch
  • 26 - 0 - keep as default

 

3-Position Momentary Switch

You can also use "3-position" Momentary switches in the same way with the Fibaro Dimmer 2. These switches can give a more intuitive control for the user because it operates like a traditional rocker switch with up and down push positions which work well for dimming up, dimming down and on / off commands.

3-Position Momentary SwitchFigure 5: Using 3-Position Momentary switches with Fibaro Dimmer 2.

To install this type of switch you simply leave the 3-core wired between the switches intact and connect the "L1" wire to the Dimmer 2's S1 input, the "L2" wire to the Dimmer 2's S2 input and the "COM" wire to the Dimmer 2's Sx output.

 

Fibaro Dimmer 2 Parameter Setting:

The following parameters need to be set:

  • 20 - 2 - enables the dimmer to work with a 3-position switch (default is 0 for a momentary switch)

 

Multi-Way 3-Position Momentary Switch

As with normal Momentary switches, it's easy to extend the 3-Position Momentary switch installation into a multi-way lighting system by extending the 3-core wire to other switch positions and wiring in parallel.

Multi-Way 3-Position Momentary SwitchFigure 6: Multi-way wiring using 3-Position Momentary switches with Fibaro Dimmer 2.

 

Fibaro Dimmer 2 Parameter Setting:

The following parameters need to be set:

  • 20 - 2 - enables the dimmer to work with a 3-position switch (default is 0 for a momentary switch)

 

Multi-Way with Z-Wave Wall Switch

Sometimes you may require a 2-way or multi-way lighting circuit where physical wiring doesn't already exist, or perhaps you need to re-purpose the existing wiring for something else.

Z-Wave makes this possible using something known as "Associations" - where one Z-Wave device can control another Z-Wave device directly without inter-connecting wiring.

More information on Associations can be seen in our guide here.

2-Way with Z-Wave Wall SwitchFigure 7: Using Z-Wave Switches in a 2-way circuit with Fibaro Dimmer 2.

To create this circuit you simply install the Fibaro Dimmer 2 module to suit either Toggle or Momentary switches and safely terminate the 3-core cable as required. A battery powered Z-Wave wall switch such as the Nodon Wall Switch can then be Associated to the Dimmer 2.

Don't forget to configure the Dimmer 2 for Toggle or Momentary switches!

Installation at Switch B position

In some circumstances it may not be possible to install the Fibaro Dimmer 2 module at the Switch A position - perhaps there's not enough room physically to install it there, or perhaps that position is out of range of the Z-Wave netwok. In this case it's sometimes possible to install at the Switch B position but there are a number of caveats because in this position it won't have access to both the 2-core and 3-core wire.

 

Toggle Switches - add additional wire between switches

To retain your existing standard Toggle switches, we can install the Fibaro Dimmer 2 module as shown in Figure 8.

Note: An additional wire is required to be run between the switch positions to be used as the "Switched Live"!

2-Way Wiring with Toggle Switches (Switch B)Figure 8: 2-Way Wiring System using the Fibaro Dimmer 2 with Toggle switches at Switch B location.

In this case we keep the standard Toggle switches; connecting Switch A "L1" to the Dimmer 2's S1 input and Switch B "L1" to the Dimmer 2's S2 input with the "COM" wire connected to the Dimmer 2's Sx output. We use the original "L2" wire to bring over Live from the first switch position and an additional wire is added to take Switched Live back.

The Dimmer 2 is then configured to accept S2 as the second switch control of the Dimmer module.

This gives simple On / Off control of the light from the switches but you will still be able to control the dimming level over Z-Wave if required.

 

Fibaro Dimmer 2 Parameter Setting:

The following parameters need to be set:

  • 20 - 1 - enables the dimmer to work with a toggle switch (default is 0 for a momentary switch)
  • 26 - 1 - enables the dimmers S2 switch to also control the dimmer (default 0)

 

Momentary Switches - add additional wire between switches

For full On / Off and dimming control we can replace the Toggle wall switches with similar styled Momentary switches.

Note: An additional wire is required to be run between the switch positions to be used as the "Switched Live"!

2-Way Wiring with Momentary Switches (Switch B)Figure 9: 2-Way Wiring System using the Fibaro Dimmer 2 with Momentary switches at Switch B location.

Here we replace the standard Toggle switches with Momentary switches and connect both Switch A and Switch B "L1" to the Dimmer 2's S1 input and the "COM" wire to the Dimmer 2's Sx output. We use the original "L2" wire to bring over Live from the first switch position and an additional wire is added to take Switched Live back.

Fibaro Dimmer 2 Parameter Setting:

The following parameters need to be set:

  • 20 - 0 - keep as default to work with momentary switch
  • 26 - 0 - keep as default

 

Toggle Switches - re-wire Switched Live to Switch B

To retain your existing standard Toggle switches, we can install the Fibaro Dimmer 2 module as shown in Figure 10.

Note: "Switched Live" needs to be re-wired to Switch B position!

2-Way Wiring with Toggle Switches (Switch B)Figure 10: 2-Way Wiring System using the Fibaro Dimmer 2 with Toggle switches at Switch B location.

In this case we keep the standard Toggle switches; connecting Switch A "L1" to the Dimmer 2's S1 input and Switch B "L1" to the Dimmer 2's S2 input with the "COM" wire connected to the Dimmer 2's Sx output. We use the original "L2" wire to bring over Live from the first switch position and re-wire Switched Live to the Switch B position.

The Dimmer 2 is then configured to accept S2 as the second switch control of the Dimmer module.

This gives simple On / Off control of the light from the switches but you will still be able to control the dimming level over Z-Wave if required.

 

Fibaro Dimmer 2 Parameter Setting:

The following parameters need to be set:

  • 20 - 1 - enables the dimmer to work with a toggle switch (default is 0 for a momentary switch)
  • 26 - 1 - enables the dimmers S2 switch to also control the dimmer (default 0)

 

Momentary Switches - re-wire Switched Live to Switch B

2-Way Wiring with Momentary Switches (Switch B)Figure 11: 2-Way Wiring System using the Fibaro Dimmer 2 with Momentary switches at Switch B location.

Connect Switch A and Switch B to the Dimmer's S1. Re-wire Switched Live (Dimmer Output) to Switch B.

Fibaro Dimmer 2 Parameter Setting:

The following parameters need to be set:

  • 20 - 0 - keep as default to work with momentary switch
  • 26 - 0 - keep as default

 

2-Way with Z-Wave Wall Switch

2-Way with Z-Wave Wall SwitchFigure 12: Using Z-Wave Switches in a 2-way circuit with Fibaro Dimmer 2.

Connect Switch B to the Dimmer's S1. Re-use existing wires to take Live to Dimmer and Switched Live to the Load.

 

Install at Switch B and use S2 from Dimmer 2 at Switch A

2-Way with Z-Wave Wall SwitchFigure 13: Using Z-Wave Switches in a 2-way circuit with Fibaro Dimmer 2.

Connect Switch A to the Dimmer A S2 and Switch B to the Dimmer B S1. Re-use existing wires to take Live to Dimmer B and Switched Live to the Load. Use Association between the two Dimmers.

Note: power to module at Switch A not shown as this would typically be taken care of for switching the other gang in a 2-gang switch.


 

Copyright Vesternet 2016

Updated: 04/11/2016

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