Standard Lighting Circuit using Fibaro Dimmer 2

IMPORTANT - Read this first!

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

We've shown wires in red to indicate that they are new wires, but it doesn't really matter what colour you use.

To protect the module a suitable rated overcurrent protection fuse must be installed on the Live input.

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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.

For information on how to physically install a Z-Wave module take a look at our guide here.

To know more about how Z-Wave modules work with different switch types make sure to read our guide here.

Standard Lighting Circuit

Standard 2-Wire Wiring System Figure 1: A Standard Lighting Circuit.

Your existing wiring will be similar to that shown in Figure 1 but this will be changed slightly when the 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 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 module's internal controls automatically keep the light on when the button is released.

More information about how the Fibaro Dimmer 2 works with different switch types is available here.

We can install the module into the 2-Wire circuit in different ways shown below. We've separated out the diagrams based on the Wall Switch type used.

Fibaro Dimmer 2 Connections

The Fibaro Dimmer 2 has six terminals to connect it to the electrical wiring:

Fibaro Dimmer2 Connections

  • L – Live
  • S2 – connection to Switch 2
  • S1 – connection to Switch 1
  • Sx – switch common
  • N – Neutral (this is connected to Sx in 2-wire installations)
  • ~ (Output) – connected to light or load

Fibaro Dimmer 2 Parameter Setting:

The following parameters may need to be set:

  • 20 - 0 - enables the module to work with momentary switch (default)
  • 20 - 1 - enables the module to work with a toggle switch
  • 20 - 2 - enables the module to work with a 3-position momentary switch
  • 26 - 1 - enables the modules' S2 switch to also control the load (default 0)

Toggle or Momentary Switches

This is probably the most common of requirements, you will install the 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 module as shown in Figure 2.

2-Wire Wiring with Toggle or Momentar Switch Figure 2: Standard Lighting Circuit using the Fibaro Dimmer 2 with Toggle switch.

In this case we keep the standard Toggle switch connecting the Switch "L1" to the module's S1 input with the "COM" wire connected to the module'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: Standard Lighting Circuit using the Fibaro Dimmer 2 with Momentary switch.

A Momentary Switch is wired similar as the Toggle Switch - Switch "L1" to the module's S1 input with the "COM" wire connected to the module'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

You can also use "3-position" Momentary switches in the same way with the module. 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.

2-Wire Wiring with 3-Position Switch Figure 4: Standard Lighting Circuit 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 module's S1 input and Switch "L2" to the module's S2 input with the "COM" wire connected to the module'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)

 

Install in Ceiling Rose

Alternatively the module can be installed in the Ceiling Rose providing you have easy access to it and enough space to accommodate the module.


2-Wire Wiring with Dimmer 2 installed in Ceiling Rose Figure 5: Standard Lighting Circuit using the Fibaro Dimmer 2 installed in Ceiling Rose

In this case we install the module in the Ceiling Rose connecting Switch "L1" to the module's S1 input with the "COM" wire connected to the module's Sx output. Don't forget to configure the module for Toggle or Momentary switches!

Copyright Vesternet 2017

Updated: 01/06/2017