RS3-351S SCARA Robotic Arm (Manipulator)
SCARA Robot · Load capacity 3 kg · Arm length 350 mm
RS3-351S specifications
The purpose of creating RS3 robots is to provide high-performance robots with greater workspace efficiency. The RS3 is a 350 mm SCARA+ with a long arm, capable of working on a 494 mm x 494 mm pallet, while the SCARA typically requires a nearly 750 mm arm. Additionally, because the RS-series arm length allows movement in the center of the work area, the movement distance is shorter, eliminating the need to always circle around the center like other SCARA robots, which greatly shortens cycle time. Combined with our industry-leading ease of use and powerful controllers, the RS series robots have quickly become favored by customers.
Model introduction
The purpose of creating RS3 robots is to provide high-performance robots with greater workspace efficiency. The RS3 is a 350 mm SCARA+ with a long arm, capable of working on a 494 mm x 494 mm pallet, while the SCARA typically requires a nearly 750 mm arm. Additionally, because the RS-series arm length allows movement in the center of the work area, the movement distance is shorter, eliminating the need to always circle around the center like other SCARA robots, which greatly shortens cycle time. Combined with our industry-leading ease of use and powerful controllers, the RS series robots have quickly become favored by customers. High performance: high workspace utilization (no dead corners); A minimum cycle time of 0.34 seconds can increase the total throughput of components; Excellent acceleration/deceleration rates and smooth start/stop times; The unique "cross-center" movement shortens cycle time; Power Drive servo technology delivers powerful dynamic performance. Unique design improves workspace utilization: hanger installation eliminates dead corners; The perfect cylindrical space can be extended to a larger area; The first and second joints can move +/- 225 mm; The second joint can be fully moved beneath the first joint, achieving high space efficiency. Powerful controller and development software: the Epson RC+ development environment offers industry-leading ease of use (saving development time); The dual-layer controller enables high-performance or low-cost RS3 robot solutions; High-performance processing power is many times faster than competitors' products; Integrated options can significantly improve system performance and shorten overall development time
RS3-351S exclusive highlights
High workspace utilization (no dead corners); A minimum cycle time of 0.34 seconds can increase the total throughput of components; Excellent acceleration/deceleration rates and smooth start/stop times; The unique "cross-center" movement shortens cycle time; Power Drive servo technology delivers powerful motor performance
Hanger installation eliminates dead corners; The perfect cylindrical space can be extended to a larger area; The first and second joints can move +/- 225 mm; The second joint can be fully moved below the first joint, achieving greater spatial efficiency
The Epson RC+ development environment offers industry-leading ease of use (saving development time); The dual-layer controller enables high-performance or low-cost RS3 robot solutions; High-performance processing power is many times faster than competitors' products; Integrated options can significantly improve system performance and shorten overall development time
The Vision Guide Vision Guidance solution offers industry-leading ease of use; Microsoft .NET supports RC180 and RC620+ (discontinued) controllers (using programs like VB, C/C++, LabVIEW, etc.); Integrated communication modules, including: Profibus, DeviceNet, CC-Link, and Ethernet/IP [RC620+ only (discontinued)]; GUI Builder allows easy creation of operator interfaces from the Epson RC+ development environment; Provides integrated Conveyor Tracking, Additional I/O, and Force Se
Automobiles; Consumer products; Industrial products; Telecommunications; Pharmaceuticals; Packaging
RS Series SCARA · Lifting Specialized · Series technical features
The RS series is a SCARA robot installed in a suspended (upside-down) setting, entering the work area from above, suitable for pick-and-place and assembly scenarios where there are obstacles below the workpiece and you need to avoid it.
Inverted installation frees up desk space, facilitating conveyor lines and multi-station layout.
RS3/RS4/RS6 cover the needs for light and medium-sized pick-up, place, and assembly.
Sharing the RC+ programming environment with a vision and I/O option ecosystem.
Typical application scenarios
Common application processes for this model (click to view process details):
RS Series SCARA · Lifting Specialized · Other models in the same series
Compare load and reach to choose the model that best suits your process.
RS3-351S model positioning and working condition adaptation
RS3-351S Belongs to the Epson RS series SCARA · SCARA horizontal multi-joint robot model dedicated to lifting, with a rated load of 3kg, motion radius of 350mm, and repeatability of ±0.01mm. Epson's technological foundation is SCARA's global market leader: RS/GX/LS series with high speed and precision, SPEL+ development efficiency, and mature vision integration; The control platform is RC700-A, and the program ecosystem is SPEL+ language (BASIC style) + Vision Guide visual.
From the perspective of working condition adaptation, typical applications for small load (3kg) positioning are:High-speed sorting, precision assembly, dispensing coating, and inspection/pick-and-place processingCommon application processes for this model include handling, assembly, and inspection. The short arm (350mm) model has a compact structure, suitable for dense workstations and close-range pick-and-place operations, with a small workspace for the work unit. ± 0.01mm repeatability is precision-grade, meeting the trajectory requirements for precision assembly, dispensing, and inspection guidance. Although the load is light, it is recommended to keep the total weight of the end and workpiece within 70% of the rated value, leaving ample acceleration margin at high speeds.
| Parameters | Engineering interpretation and usage recommendations |
|---|---|
| Rated load 3kg | It is recommended to reserve a load margin of 20%–30%; Verification is made by combining end self-weight + workpiece + imbalanced load inertia, especially sensitive to high-speed conditions |
| Movement radius: 350mm | Determine the radius of the workcell layout: bins, tooling, and fences are bounded by maximum arm span + safety distance; Verify the accessibility of each pick-and-place point during cross-station service |
| Repeatability: ±0.01mm | Repeatability ≠ absolute accuracy: Precision assembly requires external measurement closed-loop or visual guidance; Long-term accuracy trends rely on annual retest management |
| Main body weight: 17kg | Installation base and foundation load-bearing check based on weight + dynamic load; Floor slab installation requires structural calculation, with heavy-duty models serving as independent foundations |
| Controller RC700-A | Decide on the process ecosystem, spare parts channels, and second-hand residual value; Currently, spare parts channels are smooth, and repair and upgrade paths are mature |
Control systems and common failure modes
The RS3-351S is equipped with the RC700-A controller, with a programming language and development environment of SPEL+ (BASIC style) + Vision Guide for vision. Maintenance of this generation of control platforms focuses on three basic components: power, storage, and cooling—most "sudden downtime" can be detected in advance when preventive maintenance is in place.
| Failure mode | Typical performance | Disposal recommendations |
|---|---|---|
| SCARA synchronous belt tension attenuation and wear | SCARA Synchronous Belt Tension Attenuation and Wear (Main Cause of Precision Drift) | Included as a mandatory inspection item for annual maintenance, with spare parts stocked in advance |
| The encoder battery is depleted | Encoder battery depleted (loss of origin and calibration data) | Initial interpretation of alarm codes by reference with manuals, remote diagnosis allows for early positioning |
| Driver alarm | Driver alarm (high-speed overcurrent) | Daily inspection coverage, with abnormal trends (abnormal noises/temperature rise/errors) recorded |
| RC controller fan and power supply aging | RC controller fan and power supply aging | Quarterly dust removal maintenance and cabinet temperature monitoring |
| Maintenance projects | Cycle recommendations | Key points |
|---|---|---|
| Timing belt tension adjusted by periodic inspection (SCARA specific item) | By cycle | Timing belt tension adjusted by periodic inspection (SCARA specific item) |
| Annual battery replacement | Year | Battery replacement annually, calibration data backup |
| Guide rails and screw lubrication (LS/GX series) | According to the manufacturer's manual cycle | Guide rails and screw lubrication (LS/GX series) |
| Cable and drag chain inspection | every six months | Insulation, shielding, and bending radius inspection of power and encoder lines, as well as wear of cables inside the drag chain, are the main causes of intermittent faults |
| Zero point and accuracy retest | Every year | Repeatability measured by dial gauges or laser trackers, drift trend digitization—accuracy degradation can be seen six months in advance |
| Control cabinet dust removal and fans | Every quarter | Filter cleaning, fan speed and noise checks, cabinet temperature recording; Dust environments shorten the cycle |
Henghuan's service capabilities for RS3-351S
This site is a third-party robotics technology service provider. The eight major business supports related to RS3-351S are as follows (sorted by service frequency for each model):
- Maintenance and repair: For on-site diagnostics, board-level maintenance, and annual maintenance contracts for RS3-351S—such as periodic inspection and adjustment of synchronous belt tension (SCARA unique item), we will implement SOPs and respond to Sichuan-Chongqing on the same day.
- Used & in-stock robot sales: SCARA has a large second-hand circulation and is the preferred choice for 3C and electronic assembly conditions; Procurement focuses on inspecting belt and guide rail wear; The RS3-351S or equivalent models in stock come with a full functional test report and a 12-month warranty.
- Sales of new industrial robots: When adding new production lines or replacing entire batches, we conduct cross-brand selection comparisons based on process requirements (including models of the same grade as Epson), and provide configuration and pricing plans.
- Applied technology services: Process programming, trajectory optimization, tap time potential, and model change formula management for the RS3-351S, with targeted commissioning according to handling, assembly, and inspection conditions.
- Research and development of automation equipment: Custom fixture ends, peripheral tooling, and safety fences for RS3-351S, with interfaces designed according to Epson flange and IO standards.
- Robot rental: For short-term capacity or process validation periods, RS3-351S equivalent in-stock models can be rented, including transportation, installation, and commissioning; flexible rental periods allow for transfer.
Common issues with this device
Is it easy to find spare parts for RS3-351S?
Epson: The spare parts channel for this generation is smooth; we have in-stock or short-cycle channels for standard parts such as drivers, power modules, batteries, and teach pendant components; It is recommended to allocate consumables for periodic inspection and adjustment of synchronous belt tension (SCARA specific items) according to the annual maintenance contract.
With a rated load of 3kg, how much weight can it actually handle?
The rated load is the static load limit of the flange surface. In actual selection, three factors must be considered: the self-weight of the end fixture (vacuum suction cup groups or grippers often account for 2–5kg), the inertia generated by the workpiece offload (checked according to the inertia ratio when the center of gravity deviates from the flange center), and the dynamic load during high-speed movement. The conventional engineering practice is to keep the "end + workpiece" within 70%–80% of the rated value to ensure cycle time and service life.
If the equipment's accuracy deteriorates after several years of use, how can it be restored?
According to the inspection order: first check whether the zero point is drifting (common after collision or battery depletion), then perform zero calibration; Check the reducer's return error (actual measurement of forward and reverse positioning deviation; if exceeded, disassemble or replace); Then check the installation base fastening and foundation settlement; Finally, trajectory compensation parameter restructuring. Most accuracy issues can be mostly restored after calibration and maintenance, so there is no need to rush into major repairs—we first release the inspection data before deciding on the plan.
Is the used RS3-351S worth buying?
SCARA has a large second-hand circulation and is the preferred choice for 3C and electronic assembly applications; Procurement focuses on checking for belt and guide rail wear. Three essential items for second-hand procurement: comprehensive inspection reports (axial accuracy, driver status, insulation and battery), maintenance history and operating hours, controller generation, and software license integrity. Every used machine we sell comes with inspection records and a 12-month warranty, and we can also accept third-party inspections designated by customers.
Need technical support or procurement for this model?
Whether it's model selection comparison, installation and commissioning, or maintenance of in-use equipment, you can contact Henghuan. Tell us about your processes, loads, and equipment status, and we will provide third-party technical support and solution recommendations.
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