Application Scenarios
A Tier-1 automotive weld shop in eastern Germany runs a fleet of 22 IRB 2400s on a two-shift spot-welding line. After nine years of service, three cells started showing the classic symptom: micro-judder at the wrist during gun orientation, leading to ±1.5 mm weld-point drift that the line QC kept kicking back. The integrator’s first instinct was a controller tune-up, but current signature checks pointed to the wrist motor — the 3HAC10602-2 on A4/A6 had developed bearing play and the encoder pulses were starting to drift under thermal load. Swapping in a fresh 3HAC10602-2 (genuine ABB, encoder pre-aligned) brought wrist repeatability back inside 0.05 mm within the same shift. No robot re-mastering, no S4C+/IRC5 parameter change — just unbolt the old wrist motor cassette, bolt the new one, run a quick axis calibration, and the cell was back welding. For a line where one robot down = 120 bodies/hour at risk, that half-day fix paid for itself before lunch.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 3HAC10602-2 |
| Manufacturer | ABB Robotics |
| Product Category | Servo Motor Unit (Axis 4 & 6 integrated) |
| Robot Compatibility | IRB 2400 / 2400L / 2400T (full family) |
| Motor Type | Permanent Magnet Synchronous (PMSM) |
| Rated Voltage | 230 VAC (via robot drive module) |
| Continuous Torque | Axis 4: 12 Nm / Axis 6: 8 Nm (typical) |
| Max Speed | 3000 rpm |
| Feedback Device | Incremental optical encoder, 2048 PPR |
| Protection Class | IP54 (dust / splash resistant) |
| Cooling / Weight | Natural convection / approx. 4.2 kg |
Technical Principles and Innovative Values
- Innovation Point 1: Dual-axis shared-housing design. The 3HAC10602-2 packs A4 and A6 drive trains into one cast-aluminum wrist cartridge. Thermal expansion of both axes tracks together, which matters when the robot is holding a 10 kg spot-weld gun at 0.8 m reach — mismatched thermal drift between axes is what causes those “mysterious” trajectory errors at hour 8 of a shift.
- Innovation Point 2: Vacuum-impregnated windings + shielded encoder loom. The 3HAC10602-2 is built for the weld-shop reality: stray arc strike, coolant mist, and nearby 100 kVA transformers. Windings get vacuum varnish dip for moisture resistance; the encoder cable is fully shielded and routed inside the arm backbone so it doesn’t pick up commutator noise from the adjacent A1/A2 drives.
- Innovation Point 3: Pre-aligned encoder, zero-tool-free swap. ABB ships the 3HAC10602-2 with the encoder commutation preset to the wrist mechanical zero. On a healthy IRB 2400 with retained calibration data, a swap rarely needs a full re-master — a quick S4C+ / IRC5 “Calibrate Axis 4,6” cycle is usually enough. That’s the difference between a Saturday night PM and a Monday production casualty.
Application Cases and Industry Value
Case 1 — Appliance press-line, Mexico (2022): An IRB 2400 handling 8 kg stampings on a 12-cycle/min dial index started throwing $1001 Axis 6 overspeed intermittently after a cabinet HVAC failure pushed ambient to 48 °C. The root cause: encoder disc slip inside the 3HAC10602-2 due to aged bearing grease. Replacement with a tested-surplus 3HAC10602-2 plus a cabinet fan upgrade eliminated the fault; MTBF on that cell went from 6 weeks to 14 months tracked.Case 2 — Foundry deburring, Czech Republic (2023): IRB 2400T with extended arm doing die-grinder duty. A4/A6 see high side-loads from tool reaction torque. The original 3HAC10602-2 lasted ~28 k hours before bearing rumble crossed the vibration alarm. The plant keeps one 3HAC10602-2 on the local shelf now — swap + SMB battery check takes the maintenance crew about 45 minutes including cleanup. They quote a €3,400 saving per unplanned stop avoided.
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