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Controlling Somfy IRS 300 Blinds with Fibaro Relays

This guide shows how to control Somfy IRS 300 24V blind system via Z-Wave using the Fibaro 2x1.5Kw Relay.

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 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 2x1.5Kw Relay 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-221)Figure 2: Somfy IRS 300 Wiring with Fibaro Relay (FGS-221)


Once you have the 2x1.5Kw relay 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 2x1.5Kw Relay is configured by default to work with external toggle switches, so you need to change parameter 14 to 1 to enable it to work correctly with the momentary wall switch.

Relay to act as a Momentary Switch

When turn 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 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)
  • 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 30DCT motor..

Related Information

Copyright Vesternet 2014

Updated: 30/06/2014

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