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3. Key Technical Specifications
These values are typical for the REM 545 family; always confirm exact ratings in the OEM datasheet for your specific wiring and CT/VT ratios.
| Parameter | Value / Description |
|---|---|
| Product family | ABB REM 545 Machine Terminal, machine protection platform |
| Typical application | Protection and control of generators and generator-transformer units, MV motors |
| Measured quantities | 3-phase currents and voltages via conventional CTs/VTs |
| Main functions | Overcurrent, earth-fault, voltage, frequency, unbalance, thermal and start-up protection |
| Communication options | Serial interfaces per REM 54_ platform (for SCADA/remote control integration) |
| Mounting | Switchboard/panel-mounted machine terminal housing abb. |
| Country of origin | Finland |
| Product net weight | Approx. 10.1 kg (per spare-part listing) |
| Typical power/voltage range* | Used in systems from a few hundred kW up to multi‑MW machines |
| Product status | Legacy / discontinued, supplied as spare part |
*Treat ranges as application context, not nameplate ratings; always match to your plant design documents
- REM545BG227AAAB
4. Product Introduction
ABB REM545BG227AAAB is a REM 545 series machine terminal used for integrated protection, control, measurement, and supervision of generators, generator-transformer units, and medium-voltage synchronous or asynchronous motors. It sits in the switchboard as the central protection relay for diesel, hydro, and steam power applications where machine protection reliability is non‑negotiable.library.
Engineers usually select the REM 545 platform when they want one unit to handle short‑circuit, earth‑fault, abnormal operating conditions, and machine start‑up supervision instead of scattering functions across multiple relays. For this specific REM545BG227AAAB spare part, the appeal is straightforward: it is a direct machine terminal replacement from ABB’s legacy line, supplied as a new part for installed bases that must stay compatible with existing schemes and settings.
5. Troubleshooting Quick Reference
Use this as a 3:00 AM sanity check before blaming the REM545BG227AAAB. It assumes a typical generator or large motor protection application.
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No display/LEDs on power-up | Missing or incorrect auxiliary supply to terminal | ✅ High | Measure auxiliary supply at the REM 545 supply terminals with a calibrated multimeter. | If no voltage or out of spec, fix control power first; replace terminal only if rated supply is present and it still stays dead. |
| Intermittent reboot or self‑reset | Supply dips, grounding issues, or internal fault | ✅ High | Trend control voltage during start/stop and large load changes; check PE/ground bond. | Stabilize auxiliary supply and grounding; if reboots persist with clean power, plan relay replacement. |
| Protection does not trip for clear fault | CT/VT wiring error, incorrect settings, disabled function | ✅ Medium | Inject secondary currents/voltages with a test set and monitor relay indication and trip outputs. | If it responds correctly under injection, root cause is external (wiring/settings); otherwise suspect internal failure or misconfiguration. |
| Unexpected or nuisance trips | Wrong settings, incorrect CT/VT ratios, wiring noise | ✅ Medium | Download/inspect settings; compare current values with single‑line, CT/VT nameplates, and coordination study. | Adjust settings per design; only blame the terminal after ruling out coordination and ratio mistakes. |
| Communication to SCADA fails | Port settings mismatch, failed serial interface | ✅ Medium | Check protocol, baud, parity, and address; perform loopback or connect a test HMI/PC. | If other devices work on the same link with same settings, suspect the REM 545 comm board or port. |
| Some measurements show “zero” or dashes | One CT or VT phase open, blown fuse, terminal issue | ✅ Medium | Check CT/VT secondary fuses, measure secondary voltages/currents at the relay terminals. | Restore proper secondary circuits; if wiring is intact and readings are still wrong, hardware input stage may be damaged. |
| Front‑panel keys unresponsive | HMI keypad fault, menu lockout/authorization levels | ✅ Medium | Try remote access (PC tool) and menu navigation via password; power cycle once under controlled conditions. | If remote access works but keys stay dead, the front panel/HMI portion likely needs relay replacement. |
| Multiple protection LEDs and self‑diagnostic alarm active | Internal self‑supervision alarm | ✅ High | Read self‑diagnostic/status via display or configuration tool. | High‑priority internal faults usually justify replacing the terminal rather than field repair. |
If you are stuck after these checks, gather photos of the front panel, event lists, disturbance recordings, and supply measurements, then contact technical support so they can assess whether the REM545BG227AAAB itself is the root cause.library.abb+2
6. Frequently Asked Questions (FAQ)
Q1: Is ABB REM545BG227AAAB still in production or is it a legacy spare?
The REM 545 family is treated as a legacy/older platform, and current sources list REM545BG227‑ variants as discontinued or legacy items supplied as spare parts. Treat this unit as an installed‑base replacement rather than something for new greenfield designs.
Q2: What is the main application for REM545BG227AAAB in the field?
This unit is used as a machine protection terminal for generators, generator‑transformer units, and important medium‑voltage motors such as pumps, mills, and crushers. It combines protection, control, measurement, and supervision in one device, which simplifies wiring and coordination in classic ABB generator protection schemes
Q3: Can I drop this in as a direct replacement without changing settings?
Physically, REM545BG227AAAB is intended as a spare for the REM 545 platform, so terminal layouts and functional concepts match the family. In practice, always download, back up, and compare settings and possible firmware notes before swap‑out; never assume a blank or differently configured relay will behave like the one you pulled.
Q4: Does this unit keep its configuration if I power it down during replacement work?
REM 545 terminals store settings in non‑volatile memory, so normal power cycling does not erase configuration. That said, document settings and, if possible, export configuration to a file before isolating the panel; configuration mistakes cause more headaches than actual relay hardware failures.library.abb+1
Q5: What about warranty and condition for surplus REM545BG227AAAB units?
Channel listings classify this model as a “New” spare part, and other REM545BG227‑ variants are sold as brand new with a 12‑month warranty. For any specific unit, insist on written confirmation that it is New Original / New Surplus with at least a 1‑year warranty and traceable origin.
Q6: Why is this replacement often cheaper than buying a new protection system from ABB?
You are paying for a single legacy spare, not for a full redesign, new IED platform, and engineering hours to re‑test the whole protection scheme. For plants where shutdown windows are tight and protection studies are already approved, a drop‑in REM 545 spare usually has the lowest total cost and risk.
Q7: What should I check on the old relay before pulling it out?
Before removal, record the relay type label, firmware info, communication parameters, CT/VT ratios, and protection setting groups from the current unit. Take clear photos of wiring and terminal labels so you can match connections exactly on the REM545BG227AAAB and avoid wiring or setting surprises during re‑energization.
