ABB IRB 6600 Modules: IRB66003HAC037635-003 VR3HAC037635-001/002/003/005 3HAC037635-001

Technical Dossier

Product Details And Specifications

ABB IRB 6600 Series: Comprehensive Module Range and Technical Overview

The ABB IRB 6600 is a heavy-duty industrial robot platform engineered for high-payload applications across global process industries. With a payload capacity ranging from 175 kg to 500 kg and a reach envelope of up to 2.55 m, the IRB 6600 has established a significant installed base in automotive body-in-white assembly, chemical plant material handling, nuclear facility maintenance operations, and petroleum refinery process automation. Its IRC5 controller architecture, combined with a modular mechanical design, enables field-replaceable axis computer units, drive modules, and wrist assemblies — making long-term spare parts availability a critical operational requirement for plant maintenance teams worldwide.

The Evolution of IRB 6600 Architecture

The IRB 6600 platform was introduced by ABB Robotics as a successor to the IRB 6400 series, transitioning from the S4C+ controller to the IRC5 single-cabinet controller architecture. This generational shift introduced a distributed motion control topology, where axis computer boards (DSQC series) communicate over a proprietary SERNET bus rather than the earlier parallel backplane design. Key architectural milestones include:

• Generation 1 (IRC5 launch, ~2004): Introduction of the modular drive unit (MDU) concept. Axis computers DSQC 668 and DSQC 601 defined the control layer.
• Generation 2 (mid-cycle refresh): Integration of SafeMove safety supervision modules and updated teach pendant (FlexPendant) compatibility. Wrist unit assemblies were revised with updated encoder harness routing (3HAC037635-001 family).
• Generation 3 (current production): RobotWare 6.x compatibility, updated axis computer DSQC 1000, and revised upper arm / wrist mechanical assemblies with improved IP67 sealing. Backward compatibility with earlier IRC5 cabinets is maintained at the controller level but requires firmware alignment.

The IRB 6600 series is currently in the mature/end-of-production phase for several mechanical variants. ABB has transitioned new installations toward the IRB 6700 platform. As a result, lifecycle extension support — including refurbished and new-old-stock (NOS) spare parts — is the primary procurement channel for existing IRB 6600 installations.

IRB 6600 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the ABB IRB 6600 mechanical and control ecosystem. Each entry reflects a discrete, field-replaceable unit (FRU) with a defined functional role.

Wrist & Upper Arm Assemblies

• 3HAC037635-001: Wrist unit assembly, axis 4/5/6, IRB 6600 — primary FRU for wrist rebuild or replacement after collision or bearing failure.
• 3HAC037635-003: Wrist unit assembly variant, revised sealing specification — direct replacement for 3HAC037635-001 in updated production batches.
• 3HAC14980-1: Upper arm assembly, IRB 6600-175/2.55 — structural upper arm with integrated cable conduit.
• 3HAC025338-001: Axis 5 motor unit, IRB 6600 — AC servo motor with resolver, direct-mount to upper arm gearbox.
• 3HAC025339-001: Axis 6 motor unit, IRB 6600 — compact AC servo motor for wrist rotation axis.

Gearbox & Drive Components

• 3HAC028357-001: Axis 1 gearbox, IRB 6600 — primary swing axis reduction unit, grease-lubricated.
• 3HAC028358-001: Axis 2 gearbox, IRB 6600 — lower arm pivot reduction unit.
• 3HAC028359-001: Axis 3 gearbox, IRB 6600 — upper arm elevation reduction unit.
• 3HAC025337-001: Axis 4 gearbox, IRB 6600 — wrist roll reduction unit, integrated into upper arm casting.

Controller & Axis Computer Modules (IRC5)

• DSQC 668 / 3HAC025338-001: Axis computer board, IRC5 — manages motion control for axes 1–6 via SERNET bus.
• DSQC 601 / 3HAC12815-1: Main computer unit, IRC5 — system CPU running RobotWare OS.
• DSQC 662 / 3HAC026254-001: I/O module, digital 24 VDC — 16 DI / 16 DO, DeviceNet compatible.
• DSQC 663 / 3HAC026257-001: I/O module, analog — 4 AI / 4 AO, ±10 V / 4–20 mA configurable.
• DSQC 609 / 3HAC14279-1: Power supply unit, IRC5 cabinet — 24 VDC regulated output for control electronics.

Encoder & Harness Components

• VR3HAC037635-001: Encoder harness, wrist unit, variant 001 — resolver signal cable assembly for axis 4/5/6.
• VR3HAC037635-002: Encoder harness, wrist unit, variant 002 — revised connector pinout for updated wrist assembly.
• VR3HAC037635-003: Encoder harness, wrist unit, variant 003 — extended length version for floor-mount configurations.
• VR3HAC037635-005: Encoder harness, wrist unit, variant 005 — high-flex cable specification for continuous rotation applications.
• 3HAC037635-003: Wrist harness assembly, complete — includes VR3HAC037635 series cables pre-routed and terminated.

Sourcing Hard-to-Find & Obsolete IRB 6600 Parts

As the IRB 6600 platform transitions from active production to lifecycle support status, procurement of mechanical assemblies, wrist units, and IRC5 controller modules through standard distribution channels becomes increasingly constrained. DriveKNMS maintains a dedicated inventory program for IRB 6600 spare parts, covering the following sourcing categories:

• New Old Stock (NOS): Factory-sealed units sourced from authorized distributor closeouts and OEM overstock. Includes wrist assemblies (3HAC037635-001/003), axis motors, and gearbox units.
• Refurbished / Reconditioned: Mechanically rebuilt assemblies with replaced bearings, seals, and encoder harnesses. Each unit undergoes dimensional verification and functional run-in testing prior to dispatch.
• Exchange Program: Core-exchange service for gearbox and wrist assemblies — customers ship defective units and receive reconditioned replacements, reducing lead time and total cost.
• Emergency Dispatch: Priority fulfillment for unplanned downtime events. DriveKNMS maintains pre-staged IRB 6600 wrist and upper arm assemblies for same-day or next-day dispatch to minimize production line stoppage.

Quality Control for the IRB 6600 Range

IRB 6600 wrist and upper arm assemblies present specific quality verification challenges due to their multi-axis mechanical integration and resolver-based encoder architecture. DriveKNMS applies the following test protocol to all IRB 6600 units prior to shipment:

• Dimensional Inspection: Wrist flange runout measured per ABB tolerance specification using CMM. Axis 4/5/6 backlash verified against OEM service manual limits.
• Resolver Signal Verification: VR3HAC037635 series encoder harnesses tested for signal continuity, insulation resistance (>100 MΩ at 500 VDC), and resolver excitation response using a dedicated resolver analyzer.
• Torque & Load Test: Gearbox output torque verified under rated load conditions. Abnormal noise, vibration, or thermal rise triggers rejection and root-cause analysis.
• IP Sealing Check: Wrist assemblies subjected to IP67 pressure test per IEC 60529 to verify gasket and seal integrity after rebuild.
• Functional Run-In: Reconditioned units are cycled through a defined motion profile on an IRC5-compatible test rig for a minimum of 4 hours before final inspection sign-off.