The ABB 3HAC029034-004, also cataloged as the 3HAC029034 rotary AC servo motor with pinion, operates as a dedicated wrist-axis actuator executing closed-loop torque and position commands across IRB 4600 manipulator Axis 4, 5 and 6 under IRC5 drive control.

Catalog Number Decoding

• 3HAC: ABB Robotics hardware component prefix (drive/motor/teach pendant family)
• 029034: Internal design index for IRB 4600 wrist-axis rotary motor, type C
• -004: Variant revision with integrated pinion, Axis 4-5-6 fitment
• Spare/common-key form: 3HAC029034004 (hyphen omitted)

Hardware Specifications

IRC5 Drive Bus Coupling and Firmware Flash Rules

The 3HAC029034-004 receives PWM power from an IRC5 axis drive module (e.g. 3HAC024488-001 class) over shielded motor cable with separate encoder return. Position loop closes in the IRC5 Axis Computer (SMB/DSQC 377A chain) at 4 kHz current loop, 250 micros velocity loop. Firmware is not field-flashing on the motor—encoder calibration data is stored in the manipulator SMB EEPROM; swapping motor without transferring SMB backup forces a fine-calibration routine (FlexCal) before motion release. I/O density scaling does not apply; each motor is 1:1 mapped to Axis 4/5/6 in the robot configuration file. EtherNet/IP or Profinet licenses reside in the controller, not the motor. Backplane bus velocity licence is irrelevant—this is a rotating actuator, not a rack module.

Ordering Info

• 1 x 3HAC029034-004 rotary AC servo motor with pinion (Axis 4-5-6, IRB 4600)
• 1 x Integrated absolute encoder header (pre-assembled)
• 1 x O-ring and pinion retention circlip set (pre-fitted)

Manipulator Mounting and Cable Rules

• Seat motor into wrist housing with M5 cap screws, torque 4.5 N·m; verify pinion mesh backlash < 1 arc-min before closing cover.
• Route motor power and encoder cables in separate spiral conduit; minimum bend radius 10 x cable diameter.
• Shield braid of encoder cable terminates to SMB shell only, never to wrist ground strap twice (no ground loop).
• Perform SMB backup (Backup/RAPID + SYSID) before mechanical removal; restore after fitment or run FineCal.
• Do not power IRC5 drive with motor disconnected—uncommutated phase fault trips F8042 and latches SMB.

Frequently Asked Questions

Q: Can the 3HAC029034-004 be fitted to IRB 6600 or IRB 1600 wrist?

A: No. Pinion tooth count and shaft flange match IRB 4600 Axis 4-6 only. Forcing fit on IRB 6600 strips the gear train; on IRB 1600 the housing bolt circle is 82 mm vs 95 mm.

Q: Is the integrated pinion replaceable separately from the motor?

A: No. Pinion is pressed on the rotor shaft and retained by circlip at factory. Field pressing damages encoder magnet ring; ABB ships only the complete motor assembly.

Q: What happens if SMB EEPROM is not backed up before swap?

A: New motor boots with zero encoder offset. IRC5 reports "Robot not calibrated" and blocks motion. FineCal (3-point per axis) or restoring SMB backup is mandatory before jogging.

Q: Does the motor contain a brake?

A: Axis 4-6 wrist motors on IRB 4600 use gravity-held gearing; no spring-applied brake is fitted on 3HAC029034-004. Axis 1-3 carry brakes, not this unit.

Q: What is the encoder signal level cited as 1.5 V?

A: 1.5 V is the differential TTL logic high of the absolute encoder feedback, not motor supply. Motor commutates on 48 VDC-class drive bus; confusing the two misdiagnoses cable wear as controller fault.

Q: Can the motor run on a non-ABB drive (e.g. third-party servo)?

A: Physically yes with matched winding, but IRC5 absolute encoder protocol (serial Hiperface-class) is not open. Third-party drive loses homing and FineCal path; not supported.

Q: What is the nominal torque and how is it coupled?

A: Tn = 3.5 Nm at motor shaft, multiplied by wrist gear ratio (~50:1 on Axis 5) to ~170 Nm joint torque. Pinion drives the wrist annulus directly; no coupling flange.

Q: Hot-swap under powered IRC5 allowed?

A: No. De-energize the axis drive module and set SMB to service mode. Live disconnect arcs the 48 VDC bus and corrupts encoder counters, forcing F8021 resolver loss.