ABB 3HAC043904-001 DSQC 633C Serial Measurement Unit for IRC5

Product Condition	New original or used original. Please confirm the condition with us before ordering.
Shipping	Ships from Shanghai, China. Typical delivery lead time is 3-5 working days after order confirmation, via DHL / FedEx / UPS with secure protective packaging. Actual lead time depends on the specific condition and stock status confirmed with us.
Buyer Benefits	Genuine ABB 3HAC043904-001 serial measurement unit — ABB designation DSQC 633C. Carries the robot's position and measurement feedback path, so the controller keeps the axis-position reference across power cycles. Documented as a complete unit with serial measurement board and bracket; distributor documentation also identifies it as the RMU102 three-pole battery-contact variant. Replacement goes with the revolution-counter procedure — we flag this before you order, so the planned stop includes the commissioning step. Each unit is inspected before shipment, with electrostatic-safe packaging and full order tracking from Shanghai.
Item Location	Shanghai, China
Payment	We accept PayPal, T/T (bank transfer), and Alibaba Trade Assurance.

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Description

Serial Measurement Unit for ABB IRC5 Robot Systems

Specifications

Part Number	3HAC043904-001
ABB Designation	DSQC 633C
Brand	ABB
Category	Serial measurement unit (SMB) — robot position and measurement feedback
Definition	ABB 3HAC043904-001 is the DSQC 633C serial measurement unit used in the position-feedback path of compatible ABB robots.
Function	Carries the serial measurement link between the manipulator axis feedback and the controller, so the controller retains the axis-position reference across power cycles.
System Compatibility	ABB IRC5 controller platform. Confirm your robot model, serial number and controller generation against the ABB parts list before ordering — SMB revisions are not interchangeable by appearance.
Assembly Content	We confirm the assembly content for your unit before supply — send us the part number and the machine it came from.
Installation	Robot base / manipulator electronics compartment
Service Level	L2 spare in ABB robot service documentation
Battery	The backup battery is a separate unit in the robot base. Check its condition when the measurement unit is replaced; if it is depleted the axis-position data can be lost.
Commissioning	After replacement the revolution counters must be verified or updated before the robot returns to production.
Selection Rule	We confirm the selection rule for your unit before supply — send us the part number and the machine it came from.
Net Weight	Send us your part number — we confirm the packing weight of this unit with your quote.
Dimensions	Send us your part number — we confirm the dimensions of this unit with your quote.
Customs Tariff Number	Classified for your destination at quotation — send us your part number and we confirm the HS code on the invoice.
Country of Origin	Stated on the commercial invoice. Send us your part number and we confirm the origin for your shipment.
Condition	New original or used original. Please confirm the condition with us before ordering.

Industrial Applications

Restoring the position-feedback path on an ABB robot after the serial measurement unit has failed or become unreliable.
Recovery work where axis-position data has been lost and the revolution counters have to be re-established.
Planned maintenance on IRC5 cells where the measurement unit or its backup battery is renewed on a schedule.
Cells where repeat positioning accuracy matters — welding, machining tending, precision assembly — and losing the axis reference means recalibrating the robot.
Robot relocation and refurbishment projects where the measurement hardware is refreshed together with the manipulator.

Design Purpose

An IRC5 controller does not read each axis directly. Position feedback from the manipulator is collected and passed back over a serial measurement link, and the unit that terminates that link on the robot side is the serial measurement unit. It is the reason the controller can be switched off and still know where the robot is standing when power returns — the axis-position reference is held at the manipulator rather than being re-taught every start-up.

Because that reference is hardware-held, the unit is a revision-specific spare. The DSQC 633C is one revision in this family, and it is identified by the complete article number together with the bracket form and battery-contact arrangement that go with it — two units can look alike and still not be interchangeable. Replacement is also not finished when the unit is fitted: the revolution counters have to be verified or updated before the robot can run correctly, and the backup battery condition is checked at the same time, since a depleted cell costs the robot the very position data the unit exists to protect.

Before you order and before you install

Match the revision: confirm the complete article number and the DSQC 633C designation, plus the bracket form and battery-contact type. Visual similarity does not establish interchangeability.
Plan the commissioning step: after fitting, the revolution counters must be verified or updated. Budget the stop for that, not just for the physical swap.
Check the backup battery: the battery is a separate unit in the robot base. If it is depleted, the position data can be lost — renew it with the measurement unit rather than leaving the new unit on an old cell.
Record first: note the current revolution-counter values and photograph the connector, bracket and mounting orientation before removal.
Energy isolation: de-energize and lock out the robot before opening the electronics compartment.
ESD protection: handle the unit with electrostatic discharge protection and avoid touching connector pins and board edges.
Qualified personnel: replacement and commissioning must follow the applicable ABB robot product manual and be done by personnel familiar with the IRC5 measurement system.

Common Failure Modes

No or unreliable serial measurement communication, so the controller cannot read the manipulator position.
Axis-position data lost after a backup battery has run down, requiring revolution-counter update and recalibration.
Measurement faults that appear intermittently with manipulator movement — typically the connector, cabling or a poorly seated contact rather than the board itself.
Corrosion or moisture at the connector or battery contact in the robot base compartment.
Replacement completed without the revolution-counter update, leaving the robot unable to run its programs correctly.
Wrong revision fitted — a similar-looking measurement unit with a different bracket or battery-contact arrangement.

Alarm codes for this unit are shown on the controller display. Send us the fault code and we confirm the diagnosis and the matching spare part.

Why Choose Us

Specialized in industrial robot spare parts for ABB, FANUC, KUKA and YASKAWA.
Revision confirmation before quotation: we check the DSQC 633C designation, bracket form and battery-contact type against your robot model and serial number, so the unit matches the one installed.
We flag the commissioning step up front — revolution-counter update and battery check — so a planned stop does not turn into a second outage.
We can supply the related measurement boards and SMB battery units so the whole position-feedback path is covered.
Quote-based service — send your inquiry with the robot model, serial number and the marking on your existing unit for a matched offer.

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