Somfy LS40 412R2 Wired Motor Tube and Limit Setup Guide

Not every job wants a radio. On a rolling shutter tied into a building automation panel, or a bank of screens driven from relay outputs, a wired motor is the right answer and the radio is a liability. The Somfy LS40 412R2 RH without Fast Connector (1024192) is the strongest motor in the wired 40mm range at 12 Nm, and it carries no receiver at all.

Somfy describes it as a wired 40mm motor for blinds and screens. Read that as written. There is no pairing step, no transmitter, and no radio to program.

Tube diameter starts at 37 mm

Somfy publishes a minimum internal tube diameter of 37 mm for this motor, which is tighter than the 38 mm floor on the Sonesse 40 range. That extra millimetre opens up compact tubes a larger motor cannot enter.

Measure the inside of the tube. A nominal 40 mm outside diameter tube with a heavy wall can fall under 37 mm once the profile is accounted for, and an installer working from the outside dimension finds that out at the bench.

The head is thin and round rather than star, so the bracket has to accept a round head. That is the first thing to check against hardware already on the shelf.

Verified specifications

Figures come from Somfy's published product record for 1024192. Somfy also publishes a 49.6 kg CO2 lifecycle footprint for this motor, which turns up on LEED and WELL documentation packages.

Zero standby draw changes the panel math

A radio motor listens all the time, so it draws a fraction of a watt around the clock. This one draws nothing at rest and 125 W while moving.

On a single shade that difference disappears into the rounding. On a facade with sixty screens on a building automation panel it shows up in the load schedule, and a designer sizing a circuit works from 125 W per motor at peak with nothing between cycles.

IP44 puts the motor outdoors. Somfy lists it for awnings, exterior solar screens, projection screens, and rolling shutters, which is a wider application set than the interior-only Sonesse range.

Mechanical limits and what they ask of the installer

Limits get set with the progressive adjusting knobs on the motor head rather than from a remote. An installer reaches the head, turns the knob, runs the shade, and repeats until the stops land.

Plan access before the fabric goes on. A motor buried in a closed pocket with no service panel turns a five minute adjustment into an hour, and fabric settles over the first season on an exterior screen, so a second visit is likely on a tall unit.

The upside is that mechanical limits hold without electronics. Nothing to lose in a power cut, nothing to reprogram after a surge.

Wiring practice at the switch

Four conductors leave the motor. Two of them carry the up and the down commands as separate lines, alongside a shared neutral and a ground, which is why a wired tubular motor needs a switch that closes one direction at a time rather than a simple on and off.

Never bridge the up and the down conductors of two motors together at a single switch. Wired tubular motors sharing a direct splice can back-feed through each other, and the fix arrives as a pair of replacement motors. A bank of screens running from one control point takes a group controller or a relay module built for the job, and the electrician wires each motor back to that device.

Leave service slack at the head. A motor replaced in year ten needs a few inches to work with, and a tight termination at the pocket is the one that fails when a technician pulls the tube down.

Crown and drive for the 400 Series platform

The crown centers the motor in the tube and the drive hands rotation to the tube wall. Match the pair to the tube profile.

Two inch tube takes the Somfy LS40 2 in Crown and Drive Set (9016352). Standard 40mm work runs the Somfy LS40 Crown and Drive Set (9012224), and the Somfy LS40 Rubberized Crown and Drive Set (9016654) damps the mechanical noise that transfers from the drive into the tube wall on a quieter job.

Shops carrying 500 Series hardware from LT50 work reach for the Somfy 400 Series to 500 Series Crown and Drive Adaptor Kit (9012226), which lets a 400 Series motor drive a tube already fitted out for the larger platform. That saves reordering hardware on a mixed retrofit.

Ordering

Order the motor, a crown and drive set matched to the tube profile, and a bracket that accepts a thin round head. Confirm the tube's inside diameter clears 37 mm before anything ships.

The LS40 412R2 RH (1024192) arrives with a bare 4-wire cable and no Fast Connector, so the electrician lands it directly at the switch or the panel. Somfy covers it for 5 years.

Questions we get on this motor

Does the LS40 412R2 work with a Somfy remote?

No. Somfy builds this reference as a wired motor with no radio receiver, so it takes commands from a hardwired switch or a relay output rather than from a handheld. Jobs that want radio control move to an Altus RTS or a Sonesse RTS motor, or add an external RTS receiver ahead of the motor.

What tube does the 412R2 fit?

Somfy publishes a minimum internal tube diameter of 37 mm. Measure the inside of the tube rather than the outside, since a heavy wall profile on a nominal 40 mm tube can drop the usable bore below the limit. Pair the motor with an LS40 crown and drive set matched to the profile.

How are the limits set on a wired LS40 motor?

With the progressive adjusting knobs on the motor head. An installer reaches the head, turns the knob, runs the shade, and repeats until the stops land correctly. Plan physical access to the head before the fabric goes on, since exterior fabric settles over the first season.

Can the 412R2 go on an exterior screen?

Yes. Somfy rates it IP44 and lists awnings, exterior solar screens, projection screens, and rolling shutters among its applications. Mount the head so water drains away from it and leave a drip loop below the cable entry point.

Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.