Description
Product Overview
The ABB UCU-26 3AXD50000645770 is an industrial drive control unit used in compatible ABB converter systems. It manages drive-control functions and communicates with converter modules through fiber-optic links. The UCU-26 provides up to 26 fiber-optic connection pairs, making it suitable for supported drive architectures that require extensive communication with converter modules. It also incorporates data-logging functionality to help capture operating information for fault analysis and maintenance.
For plant engineers, this unit is part of the drive’s control architecture, not simply a replaceable interface card. The hardware includes three slots for I/O extensions, encoder interfaces, or fieldbus adapters, along with a dedicated slot for a DDCS communication option. Two Ethernet ports serve the control network, while two others support tool and gateway communication. A removable UMU-01 memory unit holds the microSDHC card used for the control program and related data. The control unit requires an external 24 VDC supply within its documented operating range.
When sourcing the ABB UCU-26 3AXD50000645770, verify both the control unit and its memory unit. ABB’s replacement procedure requires the new controller to be correct for the equipment configuration, including the control program identified on the memory-unit label. The hardware manual states that UCU-26 can be replaced by another UCU-26; do not assume a lower-capacity UCU model is an acceptable substitute. Before commissioning, confirm the connected converter hardware, fiber-optic connections, control program, and any safety-related functions.
Product Introduction
A drive-control replacement must match the converter architecture and application data, not just the controller’s physical form. The ABB UCU-26 3AXD50000645770 provides control and fiber-optic communication for supported industrial drive systems, with up to 26 fiber-optic connection pairs.
Before ordering, check the memory unit, control-program label, option modules, and existing wiring. During commissioning, verify converter communication and test any connected Safe Torque Off (STO) circuit according to the applicable drive safety procedure.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | |
| ABB Part Number | 3AXD50000645770 |
| Manufacturer | ABB |
| Product Type | Industrial drive control unit |
| Control Unit Family | UCU-22/23/24/25/26 |
| Fiber-Optic Connections | 26 pairs |
| External Supply | 19–32 VDC |
| Supply Current | 2.9 A, as specified in the hardware manual |
| Memory Unit | Removable UMU-01 |
| Memory Card | microSDHC |
| I/O / Encoder / Fieldbus Slots | 3 |
| DDCS Communication Option Slot | 1 |
| Ethernet | 4 ports: 2 for control network, 2 for tool/gateway network |
| Drive-to-Drive Link | XD2D, RS-485 physical layer |
| Additional Serial Interface | X485, RS-485 |
| Analog Inputs | 2; voltage or current input |
| Analog Outputs | 2; 0–20 mA |
| Digital Inputs | DI1–DI6 plus DIIL, according to the hardware interface |
| Relay Outputs | RO1–RO3 usable; RO4 reserved in the documented layout |
| Installation | DIN rail |
| Real-Time Clock Battery | BR2032 |
| Replacement Rule | to , per ABB’s replacement table |
Specifications are based on ABB’s UCU-22/23/24/25/26 hardware manual. Confirm the supplied unit’s label and included accessories; the control unit alone may not include the original memory unit, microSDHC card, slot adapters, or connector plugs.
UCU-26 3AXD50000645770
Related Products and Components
- ABB UCU-22 — A lower-capacity member of the same control-unit family with two fiber-optic connection pairs. It is not a substitute for where the application requires the latter’s capacity.
- ABB UCU-23 — Provides eight fiber-optic connection pairs for supported converter configurations.
- ABB UCU-24 — Provides 14 fiber-optic connection pairs. ABB’s replacement table permits specified upward substitutions, but actual compatibility still depends on the drive application.
- ABB UCU-25 — Provides 20 fiber-optic connection pairs. Confirm the control program and equipment configuration before considering any substitution.
- ABB UMU-01 memory unit — Removable memory assembly used with the UCU family. It carries the control-program identification and microSDHC storage; verify whether it is included with the controller.
- ABB RDCO-0x DDCS communication option — Optional communication board installed in the dedicated option slot for supported DDCS interfaces.
- ABB USCA-02 slot adapter — Used when installing supported F-type option modules in the UCU’s I/O, encoder, or fieldbus slots.
- ABB FDPI-02 — Diagnostics and panel-interface accessory documented among the related UCU control-unit resources.
- ABB microSDHC memory card — Used within the memory unit. Ensure the card and control-program data are suitable for the target drive configuration.
The related items are components of the broader UCU drive-control ecosystem. Verify exact ordering codes and compatibility in the applicable hardware and firmware documentation.
Frequently Asked Questions
1. What is the ABB 3AXD50000645770 used for?
It controls compatible ABB converter systems and communicates with converter modules through fiber-optic links. Its 26 fiber-optic connection pairs support drive architectures requiring extensive converter-module communication.
2. Can I replace a with a UCU-24 or UCU-25?
Do not assume so. ABB’s replacement table specifies to for this model. A lower-capacity unit has fewer fiber-optic connections and may not support the original converter configuration.
3. Does the replacement need the original memory unit?
The memory unit is important because it contains the microSDHC card and control-program information. ABB documents transferring the memory unit to retain parameter settings when replacing a control unit. Confirm the correct procedure for the target drive, and never remove or insert the memory unit while the controller is powered.
4. What power supply does the require?
The hardware manual specifies an external supply of 19–32 VDC, with a listed current rating of 2.9 A. The manual also allows two supplies for redundancy. Verify the supply wiring and current capacity before installation.
5. Can the be hot-swapped?
Do not assume live replacement is supported. ABB’s replacement procedure calls for stopping the drive and following the electrical safety precautions in the applicable drive manual. Isolate the equipment as required and account for process interruption before replacing the controller.
6. How should I verify a new-surplus or refurbished ?
Request photographs of the part-number label, connectors, memory unit, and included accessories. Ask for a functional-test report and confirmation of whether the original memory unit and microSDHC card are included. A bare control unit may not be ready to operate in the intended drive without the correct control program.
7. What must be checked before returning the drive to service?
Verify the controller type, control program, memory unit, converter-module fiber links, I/O and fieldbus options, and communication status. If an STO safety circuit is connected to the control unit, ABB requires an acceptance test of that safety function after replacement.
Procurement recommendation: Specify ABB , 3AXD50000645770, and state whether the order must include the UMU-01 memory unit, microSDHC card, slot adapters, and connector plugs. For a replacement project, confirm the control program and STO commissioning requirements before the drive is returned to operation.
