NJ4-210-3.1 SH Six-axis robotic arm (manipulator)
210 kg / 3151 mm
NJ4-210-3.1 SH Specification Parameters
Comau NJ4 fourth-generation spot welding robot, with a hollow wrist design.
Model introduction
NJ4-210-3.1 SH: Rated load 210 kg · Maximum reach: 3151 mm · Repeat positioning accuracy: 0.10 mm · Number of axles: 6. Specifications are sourced from Comau COMAU's official website.
NJ4 Series Spot Welding Robot · Series technical features
110-270kg · Hollow Wrist · Automotive welding
Welding torch cables and signal lines pass through the arm, with good flexibility (official website).
The new dynamic structure reduces weight and size, shortens ride times, and lowers energy consumption (Comau China data).
NJ4-210/165 SH Oriented towards multi-torch composite stations.
NJ4 Series Spot Welding Robot · Other models in the same series
Compare load and reach to choose the model that best suits your process.
NJ4-210-3.1 SH model positioning and working condition adaptation
NJ4-210-3.1 SH This is an industrial robot model belonging to the Comau NJ4 series spot welding robots, with a rated load of 210kg and a motion radius of 3151mm. Comau's technical foundation is based on Fiat heritage, with traditional strengths in automotive welding and heavy hauling, and the H5/Racer series stands out for its high-speed performance. The control platform is C5G / SMART5 and NJ series controllers, with a program ecosystem of PDL language + teach pendant.
From the perspective of working condition adaptation, typical applications for positioning large loads (210kg) are:Integrated palletizing, die-casting and part-picking, heavy handling and weldingThe extra-long reach (3151mm) suits large workpieces and cross-line service, but watch stiffness and vibration at full extension. Under heavy loads, foundation bearing capacity and base-bolt tightening torque are mandatory checks at installation acceptance; cycle time degrades noticeably when inertia ratios exceed limits.
| Parameters | Engineering interpretation and usage recommendations |
|---|---|
| Rated load capacity: 210kg | 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 |
| Radius of motion: 3151mm | Determine the radius of the work unit 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 |
| Number of axes: 6 | Six-axis all-posture capability, the preferred choice for complex trajectory and inclined surface operations |
| Controllers: C5G / SMART5 and NJ series controllers | 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 NJ4-210-3.1 SH supports C5G / SMART5 and NJ series controllers, with PDL programming language and development environment set to PDL + teach pendant. 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 |
|---|---|---|
| Controller board failure | Controller board failure (long spare parts cycle from older generations) | Included as a mandatory inspection item for annual maintenance, with spare parts stocked in advance |
| Encoder and feedback system abnormalities | Encoder and feedback system abnormalities | Initial interpretation of alarm codes by reference with manuals, remote diagnosis allows for early positioning |
| Aging of driver power devices | Aging of driver power devices | Daily inspection coverage, with abnormal trends (abnormal noises/temperature rise/errors) recorded |
| Teach pendant and cable loss | Teach pendant and cable loss | Quarterly dust removal maintenance and cabinet temperature monitoring |
| Maintenance projects | Cycle recommendations | Key points |
|---|---|---|
| Batteries should be replaced periodically | By cycle | Batteries should be replaced periodically |
| It is recommended to conduct a health assessment of the control system for existing automotive wiring equipment | According to the manufacturer's manual cycle | It is recommended to conduct a health assessment of the control system for existing automotive wiring equipment |
| Lubricate the reducer according to the manual | According to the manufacturer's manual cycle | Lubricate the reducer according to the manual |
| 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 NJ4-210-3.1 SH
We are a third-party robot technical service provider. For the NJ4-210-3.1 SH we offer the following eight services, ordered by how often they are actually needed for this model:
- Maintenance and repair: on-site diagnosis, board-level repair and annual maintenance contracts for the NJ4-210-3.1 SH — brand-specific items such as periodic battery replacement are performed per our SOPs; same-day response within Sichuan and Chongqing.
- Second-hand and inventory robot sales: many units are retired from auto plants and heavy models hold steady value; for older-controller projects we recommend evaluating an upgrade at the same time; in-stock NJ4-210-3.1 SH or equivalent models come with a full-function inspection 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 class as Comau), and provide configuration and pricing plans.
- Applied technology services: process programming, path optimization, cycle-time tuning and changeover recipe management for the NJ4-210-3.1 SH, commissioned specifically for full-pallet palletizing, die-casting part extraction, heavy-duty handling and welding.
- Research and development of automation equipment: Custom fixture ends, peripheral tooling, and safety barriers for NJ4-210-3.1 SH, with interfaces designed according to Comau flange and IO standards.
- Robot rental: for short-term capacity needs or process validation, you can rent an in-stock NJ4-210-3.1 SH-class model, with transport, installation and commissioning included; rental terms are flexible and the unit can be purchased at the end of the lease.
Common issues with this device
Is it easy to find spare parts for NJ4-210-3.1 SH?
Comau This generation has smooth spare parts channels; 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 configure consumables for battery replacement periodically according to the annual maintenance contract.
With a nominal load of 210kg, 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 NJ4-210-3.1 SH worth buying?
Many retired equipment at the automobile factory has stable salvage value of heavy machinery; For older controller projects, it is recommended to simultaneously evaluate upgrade plans. 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 HenghuanBack to the full series