LS3-B401S SCARA Robotic Arm (Manipulator)
SCARA Robot · Load capacity 3 kg · Arm length 400 mm
LS3-B401S specifications
Epson LS3-B SCARA robot
Model introduction
Epson LS3-B SCARA robot battery-free motor unit: no need to replace batteries; Reduced downtime Uses a simple detachable M/C cable: removal requires no tools, enabling easy unloading; Easy to install and replace robots inside the equipment
Exclusive highlights of the LS3-B401S
No need to replace batteries; Reduce downtime
No tools needed for disassembly, enabling easy uninstallation; Easy to install and replace robots inside the equipment
LS / T Series SCARA · Economy Main Force · Series technical features
The Epson LS series is the economical flagship model for the SCARA market, covering arms of 400-1000mm and loads of 3-20kg. It comes standard with a battery-free motor unit, suitable for large-scale applications such as 3C electronic assembly, plug-in insertion, and handling. The T3/T6 are compact all-in-one machines, further reducing installation space and cost.
The LS series delivers Epson-quality speed and precision at competitive costs, making it the preferred choice for mass deployment.
No need to replace batteries, reducing downtime and maintenance time, and lowering long-term usage costs.
LS3 to LS50 cover mainstream loads and arm length combinations, offering flexible selection.
Versions compliant with ISO cleanliness standards and ESD anti-static are available, suitable for the semiconductor and medical industries.
Typical application scenarios
Common application processes for this model (click to view process details):
LS / T Series SCARA · Economy Main Force · Other models in the same series
Compare load and reach to choose the model that best suits your process.
LS3-B401S model positioning and working condition adaptation
LS3-B401S Belongs to the Epson LS / T Series SCARA · The economical flagship SCARA horizontal multi-joint robot model has a rated load of 3kg, a motion radius of 400mm, 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 RC90-B, and the program ecosystem consists of 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 (400mm) model has a compact structure, suitable for dense workstations and close-range pick-and-place operations, with a small work unit footprint. ± 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: 400mm | 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 unit weight: 14kg | 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: RC90-B | Decide on the process ecosystem, spare parts channels, and second-hand residual value; This control generation has been discontinued or is nearing discontinuation, with longer spare parts cycles; it is recommended to evaluate control system upgrade plans |
Control systems and common failure modes
The RC90-B controller accompanying the LS3-B401S uses SPEL+ programming language (BASIC style) + Vision Guide for development environments. 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.
Strategies for the discontinued generation:The OEM spare parts supply for this model's control system has entered a long-cycle state, and the waiting time for common board failures is measured in weeks. Our recommendations fall into three categories: key production linesThe control system is upgraded to the same brand(Programs can be migrated, tooling retained, investment is about 30%–50% of the new machine); General production linesReserve redundant key spare parts(Driver board, power module, teach pendant); Near-retirement equipment is being usedHealth assessmentAfterwards, repair or replacement decisions are made based on residual value.
| 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 LS3-B401S
This site is a third-party robotics technology service provider. The LS3-B401S supports eight major business services (listed by service frequency of each model):
- Maintenance and repair: For LS3-B401S on-site diagnosis, board-level maintenance, and annual maintenance contract—such as periodic inspection and adjustment of synchronous belt tension (SCARA special item), we will implement SOPs and respond to Sichuan-Chongqing on the same day.
- Software and hardware upgrade services: This control generation has been discontinued; we offer control system replacement evaluations, program migration, and mechanical refurbishment solutions to keep equipment in service for another 5–8 years.
- 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 LS3-B401S or equivalent models in the warehouse come with a full-function 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 formula management for LS3-B401S are tailored for handling, assembly, and inspection conditions.
- Research and development of automation equipment: Custom fixture ends, peripheral tooling, and safety fences for LS3-B401S, with interfaces designed according to Epson flange and IO standards.
- Robot rental: For short-term capacity or process validation periods, LS3-B401S equivalent in-stock models can be rented, including transportation, installation, and commissioning, with flexible lease terms and repurchasing.
Common issues with this device
Is it easy to find spare parts for the LS3-B401S?
The control generation of this model has been discontinued, and OEM spare parts have entered a long-cycle supply state. Our channel strategy is a three-tier parallel approach of "OEM + disassembled parts + board-level repairs": regular parts go through spot channels, discontinued boards are used for chip-level repairs (costs about 30%–60% of the cost of replacing whole boards), and key components are recommended to be stored in the factory as redundant reserves.
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 LS3-B401S 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.
Contact Henghuan Back to the full series