Tube diameter decides this order. The Somfy Sonesse 506S2 RTS Motor (1001809) seats inside a roller tube with an inside diameter of 1.85 inches (47 mm) or larger, and a shop that orders before measuring the tube ends up holding a motor it cannot fit. Measure first. The rest of the sizing follows from that one number.
Measure the tube before you order
Somfy publishes 1.85 inches as the minimum inside diameter for this motor. Most shade shops running 2 inch or 2.5 inch aluminum tube clear that figure with room to spare, and the crown and drive set closes the gap between the motor body and the tube wall.
Measure the inside of the tube, not the outside. A 2 inch outside diameter tube with a heavy wall can drop below the working inside diameter once you account for the profile. Installers who work from the outside measurement alone find this out at the bench.
The 506S2 carries a star head. Somfy also builds a round head version of the same 6 Nm motor under reference 1001806, so check the head shape against the bracket you already stock before you place the order. The star head mates with Somfy's star head brackets and holds the motor square to the tube without a separate adaptor.
Shade types the 506S2 handles
Somfy positions the Sonesse 50 range for interior roller blinds, and the 6 Nm rating puts this motor in the middle of that range. It moves solar screens, blackout roller shades, roman shades on a roller conversion, and front projection screens.
Torque and drop work against each other. A 6 Nm motor lifts a wider, heavier fabric than a 30 mm motor manages, and the 32 rpm speed keeps a tall shade from feeling slow on the way up. Shade shops sizing a bank of matched openings tend to standardize on this reference for that reason.
Somfy measures the running noise at 45.1 dB. That figure matters in bedrooms and conference rooms, where a shade cycling at midday should not pull attention away from the room.
Verified specifications
| Somfy reference | 1001809, Sonesse 506S2 RTS |
| Torque | 6 Nm (53 in-lb) |
| Speed | 32 rpm |
| Power | 120V AC, 60Hz |
| Motor head | Star |
| Minimum tube inside diameter | 47 mm (1.85 in) |
| Radio frequency | 433.420 MHz |
| Noise level | 45.1 dB |
| Ingress protection | IP 44 |
| Warranty | 5 years |
Figures come from Somfy's own product record for reference 1001809.
Crown, drive, and bracket fit
The crown centers the motor inside the tube. The drive transfers rotation from the motor shaft into the tube wall, and the bracket carries the load at the wall or ceiling. Those parts turn a bare motor into a working shade assembly.
For a 2.5 inch tube, the Somfy LT50 2.5" Crown (9707026) sets the motor on center so the fabric tracks straight across the roll. Pair it with the Somfy LT50 2.5" Hard Clip Drive (9206019), which clips into the tube profile and takes the rotational load off the motor shaft.
At the wall, the Somfy LT50 Star Head Motor Bracket (9410651) accepts the star head directly. That bracket saves an adaptor plate and keeps the assembly length down, which helps in a tight pocket or a shallow fascia.
Somfy also builds a 50 mm hard clip drive wheel under reference 9016630 for shops running Sonesse 50 specific hardware. Match the drive to the tube profile on your own shelf, since a hard clip drive and a profiled tube have to agree on the internal keyway.
Programming the motor to an RTS remote
The 506S2 carries an RTS receiver inside the motor head, so it pairs with Somfy's radio controls without an external receiver box. Radio Technology Somfy runs at 433.420 MHz, and a shade paired once holds that pairing in the motor's memory through a power cut.
A single opening pairs cleanly with the Somfy Situo 1 Channel RTS Pure Remote (1870571). Larger jobs move to a five channel Situo or a Telis handheld, where each channel drives one shade and a group channel drives the bank together.
Somfy's TaHoma hub brings the same motor into app and voice control later, which lets a homeowner start with a handheld and add scheduling once the shades are hung and the limits are set.
Wiring and mounting notes
This motor runs on standard 120V line power. Somfy rates it IP 44, so it tolerates the incidental splash and dust of a construction site, though the Sonesse 50 range belongs on interior openings.
Set the upper and lower limits after the fabric is on the tube and the assembly is in the brackets. Setting limits on the bench and then hanging the shade costs a second trip up the ladder, because the fabric roll changes where the hem lands.
Leave slack in the motor lead at the head end. A tight lead pulls against the motor head over years of thermal movement, and a service tech replacing a shade later appreciates the extra few inches.
Adding the rest of the assembly
Order the motor, the crown and drive set for your tube, the bracket that matches the head, and the control you plan to hand the client. That order of operations keeps a job from stalling on a missing 10 dollar part.
The Somfy Sonesse 506S2 RTS Motor (1001809) ships with Somfy's five year warranty and the documentation set on the product page, including the Sonesse 50 RTS spec sheet and the 500 Series Databook.
Frequently asked questions
What size tube does the Somfy Sonesse 506S2 RTS fit?
Somfy publishes a minimum tube inside diameter of 1.85 inches, or 47 mm, for reference 1001809. Standard 2 inch and 2.5 inch aluminum roller tube clears that figure. Measure the inside diameter rather than the outside, since a heavy wall profile reduces the usable bore and can bring a nominal 2 inch tube under the limit.
How much does the Sonesse 506S2 RTS lift?
The motor produces 6 Nm of torque, which converts to 53 in-lb, at 32 rpm. That rating suits interior solar screens, blackout roller shades, roman shades on a roller conversion, and projection screens across typical residential and light commercial openings. Fabric weight, tube diameter, and shade drop together decide the working limit, so size the motor against the finished roll rather than the width alone.
Does the Sonesse 506S2 need a separate RTS receiver?
No. Somfy builds the RTS receiver into the motor head, so the motor pairs directly with a Situo remote, a Telis handheld, or a DecoFlex wall switch at 433.420 MHz. Adding a TaHoma hub later brings app control and scheduling to the same motor without changing the shade hardware or repeating the fitment work.
What is the difference between reference 1001809 and 1001806?
Both references are Somfy Sonesse 506S2 RTS motors rated at 6 Nm and 32 rpm. Reference 1001809 carries a star head and 1001806 carries a round head. The head shape decides which bracket seats the motor, so match the reference to the bracket family your shop already stocks before ordering.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
