SIASUN SR270A-220/3.21 (SR270A-220/3.21)

Most heavy-duty robots ask you to choose between lifting power and a steady hand. The SIASUN SR270A-220/3.21 (SR270A-220/3.21) is built to question that choice: a 220 kg (485 lbs) payload, a 3218mm reach and a repeatability of ±0.06mm, all in one floor-mounted machine. For a plant weighing up a large workcell, that combination is the starting point of the conversation.

The product is available through this page, by quotation.

Background

SIASUN and its engineering lineage

SIASUN is a robot manufacturer with more than two decades of engineering validation and thousands of project experiences behind it. That history matters to a buyer of heavy equipment. A robot in this class is not a catalog item to be dropped into a line unseen; it is part of a cell, with tooling, guarding, conveyors and a workpiece that all have to agree with one another.

SIASUN pairs robot products with the applications they serve, so that the machine and the job are considered together. For plants in the Caribbean, where a lot of industrial equipment is shipped in and then supported over long distances, a manufacturer with that kind of project record is a reassuring name to find on the nameplate.

Where the SR270A-220/3.21 sits

The SR270A-220/3.21 belongs to the large-payload end of the SIASUN range. You can browse the wider family in the Large Payload category, or look across the whole catalog under Industrial Robots.

Three design choices define this version. The first is rigidity: the J5 axis uses a backlash-free gearbox design, and all joints use rigid connections to minimize high-speed vibration. The second is motion planning: NURBS interpolation and variable velocity/acceleration planning make the most of the hardware. The third is the wrist: a custom wrist motor is fitted for high-inertia applications. Together they describe a robot meant to move heavy things with discipline rather than simply to lift them.

Technical Specifications

Specifications as published by the manufacturer; confirmed against the datasheet at quotation.

The manufacturer has not published the power supply, the controller model, the operating temperature, any mounting orientation other than floor, the package contents or the certifications for this model; they are confirmed at quotation.

What makes the SR270A-220/3.21 different from a standard heavy-payload robot?

The difference is in how the arm behaves once the load is on it. A long arm carrying a heavy workpiece tends to flex and shake when it accelerates or stops. SIASUN addresses this in the structure: the J5 axis has a backlash-free gearbox, and every joint uses a rigid connection. The purpose is to keep high-speed vibration to a minimum, which is what lets a robot of this size hold a repeatability of ±0.06mm.

The second difference is software. NURBS interpolation produces smooth curved paths, and variable velocity/acceleration planning adjusts the speed profile along the move. The aim is to maximize hardware performance so that the equipment runs more efficiently. In practice, this is about not wasting the capability of a robot that is already mechanically stiff.

The third difference is the custom wrist motor, designed to give strong torque and to meet the demands of high-inertia applications. When a heavy gripper or an off-center load swings at the end of the arm, the wrist is where that inertia is felt first.

Finally, the sealing is rated separately for the wrist and the body: IP67 at the wrist and IP54 for the body. A buyer should read those two figures as different ratings for different areas, and plan the cell accordingly.

How does the SR270A-220/3.21 compare with the SR270A-270/2.70?

Both belong to the SR270A family, and the SIASUN SR270A-270/2.70 is the other version in it. The model codes themselves suggest a trade-off between a longer arm and a different load rating, but we give no figures for that version here; its own page carries them. The SR270A-220/3.21 is the one to examine when the layout needs a long arm, with a reach of 3218mm and a 220 kg (485 lbs) payload. If your cell is more compact, or the part is heavier, compare the two pages side by side and ask us for both quotations.

Who is the SR270A-220/3.21 for?

The first group is the plant that handles large, heavy parts and has found that smaller robots force the layout into awkward compromises. A 3218mm reach lets one robot serve a wide area from a single floor position.

The second group is the integrator. Building a cell around a heavy-payload robot means matching grippers, fixtures and safety design to the arm, and a manufacturer that has carried out thousands of projects is a useful partner in that work.

The third group is the operation that needs precision as well as strength. A repeatability of ±0.06mm on a robot of this size is relevant where positioning of a heavy load has to be consistent from one cycle to the next.

It is less suited to anyone who needs a wall or ceiling mounting, because this model is installed on the floor. For a different size of robot, see siblings such as the SIASUN SR220A-220/2.66 or the SIASUN SR360A-280/3.20, and compare their pages directly.

What is the SR270A-220/3.21 used for?

Robots in this class are generally deployed for heavy handling work. The list below shows typical uses for a large floor-mounted industrial robot; the specific tooling for each job is selected when the cell is designed.

1. Heavy part handling: moving large castings, fabrications or assemblies between stations.
2. Machine tending: loading and unloading heavy workpieces on large machines.
3. Palletizing and depalletizing: stacking heavy cases and bulk items over a wide footprint.
4. Assembly of large components: positioning big parts where a steady hand and a firm structure matter.
5. Press and forming line transfer: carrying heavy blanks or formed parts from one operation to the next.
6. High-inertia tooling tasks: working with heavy or off-center end-of-arm tools that load the wrist.

Pricing and Availability

We do not publish prices on this page. Quotation is the way to proceed: tell us about your application and we will prepare an offer for the SR270A-220/3.21. Delivery, customs and support are arranged together with the quotation, so that you see the whole picture before you commit. The SIASUN SR270A-220/3.21 (SR270A-220/3.21) is available on this page.

Frequently Asked Questions

What payload can the SR270A-220/3.21 carry?

The payload is 220 kg (485 lbs). Remember that grippers and tooling are part of the load, so the working figure for your part will be lower.

How far can it reach?

The reach is 3218mm. This long arm span is paired with a well-balanced link length ratio, which gives the robot its excellent reachability.

How accurate is it?

Repeatability is ±0.06mm.

What protection ratings does it have?

The wrist is rated IP67 and the body IP54. Please consider these two ratings separately when planning for dust, splashes or washdown near the cell.

How is it installed?

It is installed on the floor. The body weighs 1380kg, so the foundation and the lifting plan should be considered early in the project.

What is still open for this model?

The power supply, controller model, operating temperature, other mounting orientations, package contents and certifications are points we settle with your quotation.

Where can I buy the SR270A-220/3.21 and what does it cost?

You can request it through this page, by quotation. We do not print a price here; the offer is prepared once we understand your application and delivery location.

Summary

The question at the start was whether one robot could lift heavily and still place precisely. The SR270A-220/3.21 answers with a rigid structure built around a backlash-free J5 gearbox and rigid joints, motion planning that uses NURBS interpolation, and a custom wrist motor for high-inertia work, all on a 220 kg (485 lbs) payload and a 3218mm reach. If that profile fits your cell, this page is the starting point.