Relay module

SM-RELAY-EXP

16-channel mechanical relay expansion module with which lamps, shutters, a boiler, a garage door or almost any load can be switched from the Smartive system.

The module connects to the central unit through the extender port and contains dry-contact relays: the relay only switches; the switched circuit’s supply and protection are provided by the installation.

Relays 16 mechanical, dry-contact
Relay contact Max. 10 A @ 250 VAC
Installation limit Max. 10 A @ 230 VAC / branch, with external protection
Power supply 5 VDC SELV, from the extender port
Important: every relay branch that switches 230 VAC must have an external circuit breaker or fuse rated at no more than 10 A installed in front of it. The module is a switching element and does not replace an overcurrent protective device. Installation only by a qualified person, in a closed electrical or control cabinet.

What it is for

Lighting

Switching conventional and LED lighting circuits by room or by circuit.

Shutter, gate

Up/down direction of shutter motors, pulse-style control of a garage door.

Heating, ventilation

Boiler enable contact, switching a pump or fan.

Other loads

Any circuit that stays within the branch 10 A limit.

Technical data

CharacteristicValue
Model / code / revisionRelay Module / SM-RELAY-EXP / Rev. 1.3
Relays16 mechanical relays (HRS3FNH, 5 V coil), normally open contacts
Contact ratingMax. 10 A @ 250 VAC (per relay datasheet)
Installation limitMax. 10 A @ 230 VAC per relay branch, with an external circuit breaker/fuse
Power supply5 VDC SELV; optional auxiliary 5 V/GND supply input (U1)
ControlMCP23017 I2C expander + relay driver transistors
Extender connector2 x RJ45 (daisy-chainable), pinout: SDA, 3.3V, 1-Wire, 5V, 5V, SCL, GND, GND
InsulationMin. 5.5 mm insulation distance between the 230 VAC side and the control side
Surge protectionThe module does not include a built-in SPD; if the installation requires it, it must be provided externally
ComplianceCE (LVD 2014/35/EU, EMC 2014/30/EU, RoHS 2011/65/EU)

Auxiliary 5 V supply input (U1)

If many relays pull in at once, a voltage drop can occur on the 5 V arriving over the extender cable. For this case the module has a dedicated 5 V/GND supply-injection terminal block (U1).

  • Only a CE-marked 5 V SELV power supply may be used, or another point of the same supply domain.
  • Polarity and common GND must be checked before wiring.
  • A power supply of a different voltage or one that is not isolated must not be connected.

Addressing

If several modules are connected to the central unit, each module must receive a unique address. Addressing is set with the 3-pin jumpers on the module: shorting the jumpers sets the binary address.

Never use two modules with the same jumper setting on the same bus, because this leads to an address collision and a communication fault.

Setup in the app

  • When adding a new device, select the GPIO Output option in the Device Model field.
  • After selecting the I2C expander option, enter the port number on the module.
  • Selecting the HIGH option tells the system to switch the relay on a high signal level.


Relay module