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Standard 2-Wire 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!

 

This guide shows how to install the Fibaro Dimmer 2 module into an existing light switch.

It is based on a UK style 2-wire lighting system with no neutral wire at the switch. More information about 2-wire lighting systems is available in APNT-23: Understanding 2-wire and 3-wire Lighting Systems.

Standard 2-Wire Wiring

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

Your existing wiring will be similar to that shown in Figure 1 but this will be changed slightly when the Fibaro Dimmer 2 module is installed.

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-Wire circuit in different ways shown below. We've separated out the diagrams based on the Wall Switch type used.

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

Toggle or Momentary Switches

This is probably the most common of requirements, you will install the Fibaro Dimmer 2 module at the Switch position where it has access to both Permanent Live and Switched Live.

 

Toggle Switches

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

2-Wire Wiring with Toggle or Momentar Switch Figure 2: 2-Way Wiring System using the Fibaro Dimmer 2 with Toggle switch.

In this case we keep the standard Toggle switch connecting Switch "L1" to the Dimmer 2's S1 input with the "COM" wire connected to the Dimmer 2's Sx output.

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)

 

Momentary Switches

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

 

2-Wire Wiring with Toggle or Momentar Switch Figure 3: 2-Way Wiring System using the Fibaro Dimmer 2 with Momentary switch.

A Momentary Switch is wired similalr as the Toggle Switch - Switch "L1" to the Dimmer 2's S1 input with the "COM" wire connected to the Dimmer 2's Sx output.

 

Fibaro Dimmer 2 Parameter Setting:

The following parameters need to be set:

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

 

3-Position Switch

A 3-position momentary, or retractive, switch has 3 positions and is also known as an On/Off/On switch.

It normally stays in the central (Off) position, you can then press the top or bottom parts of the switch to move it into the On positions. As this is a momentary (retractive) switch, it only remains in the On state while you press it, it returns to the central Off state when the button is released.

This type of switch provides another way of controlling the dimmer:

  • Top On
    • Press once and release - turns light onto full brightness or previously set dim level
    • Press and hold - increases brightness, releasing it keeps the lamp at that brightness
  • Bottom Of
    • Press once and release - turns light off
    • Press and hold - decreases brightness, releasing it keeps the lamp at that brightness

The switch and dimmer module can be connected to the lighting system as follows.

2-Wire Wiring with 3-Position Switch Figure 4: 2-Way Wiring System using the Fibaro Dimmer 2 with 3-Position switch.

In this case we replace the standard Toggle switch  with a 3-Position Switch connecting Switch "L1" to the Dimmer 2's S1 input and Switch "L2" to the Dimmer 2's S2 input with the "COM" wire connected to the Dimmer 2's Sx output.

This gives better controll over the dimmer's dimming capabilities.

 

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 0)
Copyright Vesternet 2016

Updated: 04/11/2016

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