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Controlling Somfy IRS 300 Blinds with Fibaro Relays



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.

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

Installing the Fibaro modules involve working with 230V 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 carried out at your own risk. Vesternet do not accept any responsibility or liability.

We work hard to keep these wiring guides accurate and up to date and would appreciate any feedback, corrections or suggestions that you may have. Please contact us using our help page or by simply emailing

This guide shows how to control Somfy IRS 300 24V blind system via Z-Wave using the Fibaro Relay Insert 2 * 1.5 KW.

Somfy have a wide range of blind systems available depending on whether you would like 230V AC (mains) or 24V DC power supplies.

This guide focuses on the Somfy IRS 300 (Infrared) system.

We also have guides for other Somfy systems:

Somfy IRS 300 (24V) Blind System

The Somfy IRS 300 is an Infrared control system, enabling a Somfy LT28 or Concept 25 (24V DC) blind motor to be controlled using a handheld IR remote control.

Somfy Sonesse 30DCT Motor WiringFigure 1: Somfy IRS 300 Wiring

The standard wiring for the Somfy IRS 300 is shown in Figure 1.

The IRS 300 has two connector blocks. One block takes the power from the external 24V power supply and provides power to the motor (controlling when it is active and its direction). The LT28 or Concept 25 motor only has two wires supplying power to it, the IRS 300 applies power to these wires to drive the motor in one direction and reverses the voltage to drive the motor in the opposite direction. This method of 'Polarity Reversal' control is common on many 24V DC motors.

An optional wall switch (ensure that it's mains rated) can also be connected to give you manual control of the blind system, this connects to the second connector block.

Installing the Fibaro Relay

The Fibaro Fibaro Relay Insert 2 * 1.5 KW is a dual-channel relay capable of controlling two 24V loads. In this application it duplicates the functions of the wall switch by behaving like two momentary switches.

Somfy Sonesse 30DCT Motor Wiring with Fibaro Relay (FGS-222)Figure 2: Somfy IRS 300 Wiring with Fibaro Relay (FGS-222)

Fibaro Relay Insert 2 * 1.5 Kw Connections

The Fibaro Relay Insert 2 * 1.5 Kw has seven terminals to connect it to the electrical wiring:

Fibaro Relay Insert 2 * 1.5 Kw Connections

  • L – Live
  • N – Neutral
  • S2 – connection to Switch 2
  • S1 – connection to Switch 1
  • Q2 – output 2
  • Q1 – output 1
  • IN – Input

Fibaro Relay Insert 2 * 1.5 Kw Parameter Setting:

The following parameters may need to be set:

  • 14 - 0 - enables the module to work with a momentary switch
  • 14 - 1 - enables the module to work with a toggle switch (default)

Once you have the Fibaro Relay Insert 2 * 1.5 KW module wired into the circuit and included into the Z-Wave system, you need to change two of the relays configuration parameters so that it works correctly in this application.

External Momentary Switches

The Fibaro Relay Insert 2 * 1.5 KW is configured by default to work with external toggle switches, so you need to change parameter 14 accordingly to enable it to work with the wall switch being used.

Relay to act as a Momentary Switch

When turned On wirelessly (Z-Wave) the relay would stay On until told to turn Off. In this application we need it to behave like a momentary switch, so that it turns off after a short period of around 1 second.

The relay includes an automatic off delay timer for each channel, these delays are controlled by parameter's 4 and 5.

Fibaro Relay Insert 2 * 1.5 KW Parameter Settings:

The following parameters need to be set:

  • 4 - 10 - turns channel 1 off after 1sec (setting is in 0.1s increments)
  • 5 - 10 - turns channel 2 off after 1sec (setting is in 0.1s increments)

You will now have Z-Wave control of the Somfy IRS 300 motor..

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Copyright Vesternet 2017

Updated: 04/12/2017

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