ABB 3HAC046277-001 Serial Measurement Unit for Robot Axis Position

Product Condition	New original or used original. Please confirm the condition with us before ordering.
Shipping	Ships from Shanghai, China. This unit contains a lithium battery (UN3091), so dangerous-goods transport restrictions apply — please contact our Shanghai office to arrange shipping and confirm the lead time.
Buyer Benefits	Genuine ABB 3HAC046277-001 — ABB catalog description: Serial measurement unit. Holds the manipulator axis-position reference and calibration data, backed by battery so the robot keeps its position data when controller power is off. Documented assembly: measurement board 3HAC044168-001 (RMU101) with battery unit 3HAC044075-001 — we confirm the board, battery-contact type and your robot serial number before quotation. We can supply the matching battery unit with the measurement unit, so the axis reference is not left on an ageing cell. Each unit is inspected before shipment, with electrostatic-safe packaging and full order tracking.
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 Robot Manipulators

Specifications

Part Number	3HAC046277-001
ABB Catalog Description	Serial measurement unit
Brand	ABB
Category	Serial measurement unit (SMB) — manipulator axis-position reference with battery backup
Definition	ABB 3HAC046277-001 is the serial measurement unit that holds the manipulator axis-position reference and calibration data, kept alive by battery while controller power is off.
Function	Stores the axis-position and calibration data of the manipulator and keeps it through power-down, so the controller knows the robot's position on restart instead of requiring a full recalibration.
Documented Assembly	Measurement board 3HAC044168-001 (RMU101) with battery unit 3HAC044075-001 and a three-pole battery contact, per distributor documentation of the ABB parts list. Confirm the board revision and contact type against your installed unit.
Installation	Manipulator base / SMB compartment
Compatibility	ABB's spare-parts record lists this unit against IRB 340 M2004, IRB 6660 M2000, IRB 1400 M2004 and the 3HAC020536-xxx manipulator variants; distributor documentation additionally references IRB 360, IRB 4400, IRB 2400, IRB 1410 and IRB 1400. Because the two lists differ, match the complete article number and your robot serial number against the ABB parts list before ordering.
Previous Article Numbers	ABB lists the following as replaced by this article: 3HAC17396-1, 3HAB3365-1, 3HAC9522-1, 3HAB3700-1, 3HAC14504-1, 3HAC14505-1, 3HAB8413-1. Send any of these numbers and we confirm the match.
Dangerous Goods Status	Classified as dangerous goods — UN3091 (contains a lithium battery). Air-freight options are limited and the unit may ship separately from other items on the same order. Contact our Shanghai office to arrange shipping.
Net Weight	0.68 kg
Gross Weight	0.68 kg
Dimensions	209 × 145 × 49 mm (net length × height × width)
Customs Tariff Number	85176200
Country of Origin	Sweden
WEEE Category	Product not in WEEE scope
Condition	New original or used original. Please confirm the condition with us before ordering.

Industrial Applications

Restoring the axis-position reference on an ABB manipulator after the serial measurement unit or its battery has failed.
Recovery after battery depletion — when the position data is lost and the revolution counters have to be updated and the robot recalibrated.
Preventive maintenance: renewing the measurement unit or its battery before the cell reaches end of life, so a scheduled stop does not become an unscheduled one.
Cells where repeat positioning accuracy matters — welding, machining tending, assembly — and losing the axis reference would mean recalibrating the robot.
Robot relocation and retrofit work where the measurement hardware is refreshed together with the manipulator.

Design Purpose

A robot controller needs to know where each axis actually is, not just where it was last commanded to go. The serial measurement unit stores that axis-position and calibration data at the manipulator and keeps it while the controller is powered down, using a battery to hold the information. When the controller restarts, it reads the stored position instead of having to be taught the robot's position again.

That dependency defines how this part behaves in service. The data is only as durable as the battery behind it, so a depleted cell does not just trigger a low-battery warning — it costs the robot its position reference, and the revolution counters have to be updated and the axis positions re-established before production can resume. For that reason 3HAC046277-001 is a matched spare: board revision, battery-contact type, robot serial number and the parts list all have to line up, and the replacement is followed by the revolution-counter procedure rather than being finished at the moment the unit is fitted.

Before you order and before you install

Expect the position data to be at risk: once the battery path is interrupted the axis-position data can be lost. Plan for the revolution-counter update and recalibration, not just the physical swap.
Record first: before removal, note the current position data and revolution-counter values, and photograph the connector, battery contact and mounting orientation.
Match the assembly: confirm the measurement board (3HAC044168-001), the battery unit (3HAC044075-001), the battery-contact type and your robot serial number against the ABB parts list.
Energy isolation: de-energize and lock out the robot before opening the SMB compartment.
ESD protection: handle the unit with electrostatic discharge protection and avoid touching connector pins and board edges.
Battery handling: observe polarity and contact type on refitting. This unit contains a lithium battery (UN3091) — do not open, crush or incinerate it, and follow applicable transport rules for the used unit.
Acceptance: after fitting, update and verify the revolution counters and check positioning before returning the robot to production. Work must follow the applicable ABB robot product manual and be done by qualified personnel.

Common Failure Modes

Battery depleted, so the axis-position data is lost and the robot asks for revolution-counter update and recalibration.
Position-data or calibration errors reported after restart — the stored reference no longer matches the manipulator.
Connection or contact problems: corrosion, moisture or a poorly seated battery contact in the SMB compartment.
Intermittent faults that follow manipulator movement, pointing at the connector or cable rather than the board.
Replacement finished without the revolution-counter update, leaving the robot unable to run its programs correctly.
Wrong unit fitted — a similar-looking measurement board with a different revision or battery-contact arrangement.

Specific alarm codes are not officially documented for this model. Please contact us with the fault code displayed on your controller for accurate diagnosis.

Why Choose Us

Specialized in industrial robot spare parts for ABB, FANUC, KUKA and YASKAWA.
Assembly confirmation before quotation: we check the measurement board, battery unit, battery-contact type and your robot serial number, so the unit matches the one installed on your manipulator.
We can supply the matching battery unit and measurement board, so position data is not left dependent on an ageing cell.
Dangerous-goods handling: we tell you up front that this unit ships under UN3091 and arrange the shipping route with our Shanghai office.
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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