GX20-B851S SCARA Robotic Arm (Manipulator)
SCARA Robot · Load capacity: 20 kg · Arm length: 850 mm
GX20-B851S Specifications
The GX20 series is a further upgrade based on the high performance of the original G20 series, designed for heavy load handling and batch packing operations, offering advantages such as high speed, high precision, and low vibration.
Model introduction
The GX20 series is a further upgrade based on the high performance of the original G20 series, designed for heavy load handling and batch packing operations, offering advantages such as high speed, high precision, and low vibration. GYROPLUS Technology: Uses gyroscope sensors to measure robot hand vibrations and performs servo control through GYROPLUS Technology. During high-speed movement, it reduces robot vibration and improves rigidity. When high-speed motion stops, residual vibration is reduced, lowering waiting time when robots work with vision, further improving efficiency. The new RC700-E controller supports OPC UA: OPC UA: OPC UA's wider communication range and improved communication performance. Robots can be directly connected to IoT-related systems. Providing convenience for the establishment of smart factories. The new RC700-E controller supports Safety Functions: the controller has a built-in safety board. Compatible with options such as SLS (Safety Limited Speed) and SLP (Safety Limited Position) to reduce downtime and achieve safer and more efficient production processes.
GX20-B851S exclusive highlights
Using gyroscope sensors to measure the robot's hand vibration, servo control is performed via GYROPLUS Technology. During high-speed movement, it reduces robot vibration and improves rigidity. When high-speed motion stops, residual vibration is reduced, lowering waiting time when robots work with vision, further improving efficiency.
OPC UA offers a wider communication range and improved communication performance. Robots can be directly connected to IoT-related systems. Providing convenience for the establishment of smart factories.
Controller built-in safety board.; Compatible with options such as SLS (Safety Limited Speed) and SLP (Safety Limited Position) to reduce downtime and achieve safer and more efficient production processes.
GX Series SCARA · High-performance flagship · Series technical features
The GX series is Epson's high-performance SCARA flagship, with a maximum load capacity of 20kg, a high-rigidity arm and GYROPLUS vibration suppression technology, and a cycle time as fast as 0.33 seconds, designed for high-end assembly applications that require strict beats and precision.
In high-power mode, the cycle time is as low as 0.33 seconds, resulting in higher output per unit time.
The unique high-rigidity arm design combined with GYROPLUS Technology delivers low residual vibration and high stability.
The repeatability of the 1st-2nd joint can reach ±0.008mm, reducing production losses.
Five levels from GX1 to GX20, with multiple installation options for countertops, ceilings, and sidewalls.
Typical application scenarios
Common application processes for this model (click to view process details):
GX Series SCARA · High-performance flagship · Other models in the same series
Compare load and reach to choose the model that best suits your process.
GX20-B851S model positioning and working condition adaptation
GX20-B851S Belongs to the Epson GX series SCARA · The high-performance flagship SCARA horizontal multi-joint robot model has a rated load of 20kg, a motion radius of 850mm, and a repeatability of ±0.025mm. 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-E, and the program ecosystem is SPEL+ language (BASIC style) + Vision Guide visual.
From the perspective of working condition adaptation, the typical use for medium-duty load (20kg) positioning is:Welding, machine tool wiring, medium-sized palletizing, and die-casting part removalCommon application processes for this model include handling, assembly, and inspection. The medium reach (850mm) meets the needs of conventional workstations, with flexible single-station layout. ± 0.025mm repeatability is the standard level for six-axis industrial robots, covering most working conditions such as welding, handling, palletizing, and loading/unloading. This level is the main stage for welding and loading; when selecting a positioner or dual stations, pay attention to the total cycle time and interference zone planning.
| Parameters | Engineering interpretation and usage recommendations |
|---|---|
| Rated load capacity: 20kg | 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: 850mm | 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: ±0.025mm | 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: 49kg | 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-E | 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 RC700-E controller accompanying the GX20-B851S uses SPEL+ language (BASIC style) + Vision Guide for programming and 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.
| 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 the GX20-B851S
This site is a third-party robotics technology service provider. The eight major business supports related to the GX20-B851S are as follows (sorted by service frequency for each model):
- Maintenance and repair: For on-site diagnostics, board-level repairs, and annual maintenance contracts for GX20-B851S—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.
- 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 GX20-B851S or equivalent models in the inventory 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 changeover formula management for the GX20-B851S are targeted for adjustment according to handling, assembly, and inspection conditions.
- Research and development of automation equipment: Custom fixture ends, peripheral tooling, and safety fences for GX20-B851S, with interfaces designed according to Epson flange and IO standards.
- Robot rental: For short-term capacity or process validation periods, you can rent GX20-B851S models in stock of the same class, including transportation, installation, and commissioning, with flexible lease terms and repurchase.
Common issues with this device
Is it easy to find spare parts for the GX20-B851S?
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 nominal load of 20kg, how much 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 GX20-B851S 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