ABB 3HAC049856-003 AC Servo Motor

ABB 3HAC049856-003 TMA 2B — Stop the Clock on Your IRB 6640 Downtime

Every minute your IRB 6640 sits offline, the production loss meter is running. A failed axis motor doesn’t wait for procurement cycles — and neither do we. The ABB 3HAC049856-003 TMA 2B rotary AC servo motor with integrated pinion is in stock at our Xiamen warehouse, pre-inspected, and ready to ship via DHL or FedEx express within 24 hours of order confirmation. We’ve handled enough emergency callouts to know that the difference between a 4-hour fix and a 4-day shutdown often comes down to one thing: whether the right part is on a shelf or on a slow boat.

This is not a generic listing. The 3HAC049856-003 is the OEM-specified motor sub-assembly for the IRB 6640 axis drive platform. The pinion is factory-installed and torque-verified to ABB specification — you pull the failed unit, bolt this in, reconnect the resolver harness, and you’re back in the production window. No field machining, no pinion press-fitting, no guesswork on torque values.

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Quick Technical Datasheet

Troubleshooting & Replacement Tips

Common failure signatures on the IRB 6640 that point to a 3HAC049856-003 fault:

• Error 50024 / 50025 — Joint Axis Overload: If this fault persists after clearing and the axis moves sluggishly or with audible grinding, the motor winding or pinion mesh is compromised. Don’t chase the drive card first — swap the motor.
• Error 50056 — Motor Current Error: Intermittent current spikes on a specific axis with no load change usually indicate a shorted winding phase. Measure phase-to-phase resistance at the motor connector before condemning the drive module.
• Error 38203 — Resolver Fault: Check the resolver harness for chafing at the cable management bracket before replacing the motor. If the harness is intact and the fault is axis-specific, the resolver inside the motor has failed — the 3HAC049856-003 replaces the complete assembly including resolver.
• Axis drifts at standstill (brake not engaged): Worn pinion teeth allow backlash that the IRC5 cannot compensate. Inspect the pinion mesh through the gearbox inspection port. If tooth wear is visible, replace the motor assembly — the pinion is not serviceable separately.

Replacement procedure notes (IRB 6640, Axis 2):

• Engage the mechanical brake and lock the arm in a safe position before any motor work. Use the brake release tool (3HAC14459-1) if manual positioning is required.
• Disconnect the motor power connector (MP) and resolver connector (FB) at the axis computer cabinet — label them before removal if you’re working on multiple axes simultaneously.
• The 3HAC049856-003 pinion is pre-meshed to ABB factory spec. Do not attempt to re-use the old pinion on a new motor body — the mesh geometry is set at the factory.
• After installation, perform a Revolution Counter Update via RobotStudio or the FlexPendant (Calibration → Update Revolution Counters). Skipping this step will cause position errors on the first move after restart.
• No firmware changes are required. The IRC5 axis computer auto-detects the resolver signal on power-up. If you’re running an older S4C+ controller, verify the axis computer firmware is at minimum revision level per ABB Service Bulletin SB-0312.
• Torque the motor mounting bolts to the value specified in the IRB 6640 Product Manual (3HAC028284-001), Section 4.3. Under-torquing causes micro-movement that degrades resolver accuracy over time.

Reliability in Harsh Conditions

The IRB 6640 is not a clean-room robot. It runs in foundries, press shops, and automotive BIW lines where ambient temperatures spike, coolant mist is present, and the floor vibrates from 800-ton presses cycling every 12 seconds. The TMA 2B motor assembly is built to survive that environment — not just survive it on paper, but survive it across multi-year production campaigns.

The motor windings are rated for continuous duty at elevated ambient temperatures, with thermal class insulation that handles the heat soak from high-cycle press-tending without accelerated degradation. The resolver is a brushless, contact-free feedback device — there are no wear surfaces to degrade in dusty or humid environments, which is exactly why ABB chose resolver feedback over optical encoders for this platform.

The integrated pinion uses case-hardened gear steel with a surface finish matched to the IRB 6640 gearbox input stage. In automotive applications where the robot runs 20+ hours per day, the pinion mesh is the highest-wear interface in the axis drive. ABB’s factory assembly ensures the tooth contact pattern is correct from day one — a field-assembled pinion rarely achieves the same contact geometry, which accelerates wear on both the pinion and the gearbox ring gear.

Units supplied from our Xiamen stock are stored in climate-controlled conditions, individually wrapped in anti-static foam, and inspected against the ABB part number label and date code before dispatch. We do not ship units with damaged connector housings, corroded terminals, or missing resolver harness strain-relief clips — details that matter when you’re doing a midnight breakdown swap and don’t have time to improvise.

Global Express Logistics

Our dispatch hub is in Xiamen, China — a major international freight gateway with daily DHL and FedEx express departures to every major industrial region. Here’s how the logistics chain works from the moment you confirm your order:

• Order confirmation → same-day pick and pack: Orders confirmed before 14:00 CST are picked, inspected, and packed the same business day. Export documentation (commercial invoice, packing list, HS code 8501.52) is prepared in parallel.
• DHL Express Worldwide: Transit time 2–4 business days to Europe, North America, Southeast Asia, and the Middle East. Real-time tracking from dispatch to delivery.
• FedEx International Priority: Available for destinations where FedEx has a service advantage. Typical transit 1–3 business days to major US and EU hubs.
• Customs clearance: We declare at accurate commercial value with full HS code documentation. For customers in the EU, we can provide EORI-compatible documentation to streamline import clearance. For customers in countries with import duty exemptions on industrial automation components, we flag this at quotation stage.
• Emergency freight: For critical production stoppages, we can arrange next-flight-out courier service from Xiamen Gaoqi International Airport. Contact us directly on WhatsApp for same-day freight options.
• Packaging integrity: The motor assembly ships in a double-walled carton with foam-cut insert. The pinion is protected with a plastic mesh sleeve. We’ve shipped to oil platforms, desert automotive plants, and sub-zero Canadian facilities — the packaging holds.

Lead time from stock: ships within 24 hours of purchase order or payment confirmation. For out-of-stock scenarios, we provide a sourcing lead time at quotation — typically 7–12 business days for ABB surplus channel procurement.

Contact Information

📧 Email: [email protected]
💬 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com
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