ABB 1MRK000005-63 Control Board – CPU / Main Board for SPAJ 110C / 130C / 140C Motor Protection Relay

Product Overview

The ABB 1MRK000005-63 is the main control / CPU board — the computing core — that lives inside ABB’s SPAJ 110C, SPAJ 130C, and SPAJ 140C DIN-mounted motor-protection relays, part of ABB’s long-running SPA (Secondary Protection A) family developed at ABB Turgi (Switzerland) and still widely deployed across water-treatment pumps, HVAC fans, compressor houses, conveyor drives, and marine/offshore auxiliary motors. While the SPAJ relay’s front face presents the LEDs, the test/setting push-buttons, and the optional local display, the ABB 1MRK000005-63 is the multilayer PCB behind that face: it hosts the 32-bit microprocessor, the flash/EEPROM that stores the motor-nameplate parameters and protection-curve settings, the A/D front-end that digitises the CT secondary (via the SPAJ’s analog-input daughter), the protection-algorithm execution (thermal overload with motor-heating memory, stall, locked rotor, ground fault, phase unbalance, under/over-current), the digital-I/O scanning (start/stop permissive, trip relay, alarm relay, CB fault contact), the RS485 Modbus port that exports the motor’s status and picks up remote setpoint changes from the plant DCS, and the self-monitoring routines that flag “board fault” or “settings checksum error” back to the SPAJ’s front LEDs.In the SPAJ mechanical architecture, the ABB 1MRK000005-63 plugs vertically into the relay’s internal backplane (a 2-row precision header, guided by the SPAJ’s moulded card cage), and is held by a single front screw that also grounds the board’s EMI shield to the relay’s metal chassis. The SPAJ relay itself is DIN-rail mounted (typically 105 mm wide, 6 TE), so the ABB 1MRK000005-63 never sees the outside world — it is supplied from the SPAJ’s internal PSU (24 V DC or 88–264 V AC/DC wide-range, depending on the SPAJ variant ordered), and the field CT/VT/Secondary wiring lands on the SPAJ’s removable terminal block, not on the ABB 1MRK000005-63 itself. For maintenance teams, the value of stocking the ABB 1MRK000005-63 is that a SPAJ that throws “Err 3” (CPU fault) or “Settings Corrupt” and won’t clear after a power cycle often traces to the board’s EEPROM or MPU — swapping the ABB 1MRK000005-63 (keep the SPAJ’s terminal block wired, just unbolt the front, pull the old board, seat the new, re-torque) restores the relay in minutes without re-terminating 8–12 CT/VT cores or re-punching the DIN rail. The relay’s parameter set (motor FLA, curve class, trip delays) is stored on the ABB 1MRK000005-63 EEPROM; on swap, the new board either inherits the old EEPROM (if the EEPROM is a separable daughter — sub-rev dependent) or needs a quick re-entry via the front push-buttons / ABB SPAsoft PC tool — a 5-minute job vs. a 4-hour “replace whole SPAJ” event.Across the SPAJ 110C (basic motor protection), 130C (adds differential for larger motors), and 140C (adds sync-check / voltage elements for generator-motor), the ABB 1MRK000005-63 is the common CPU across the sub-family — ABB kept the main board stable and differentiated the variants via the plugged-in analog / digital / communication daughters. That commonality is why the same ABB 1MRK000005-63 spare can cover a mixed SPAJ 110/130/140 fleet in a plant — the plant may have SPAJ 110Cs on 55 kW pumps, 130Cs on 250 kW compressors, 140Cs on 1 MW aux-motors, and one ABB 1MRK000005-63 cold-spare serves all three. For spare-parts buyers in continuous-process sites (WWTP, CHP, marine, offshore), the ABB 1MRK000005-63 sits alongside the SPAJ’s I/O daughters and the SPAJ’s own DIN case as the “keep the motor relay alive” set.

Category: FUJI

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	1MRK000005-63
Manufacturer	ABB Ltd. (Turgi, Switzerland – SPA / Protection heritage)
Product Type	Main Control / CPU Board for SPAJ Series Motor Protection Relay
Compatible Relay Models	ABB SPAJ 110C, SPAJ 130C, SPAJ 140C (DIN-mount motor protection)
Microprocessor	32-bit (SPA family generation)
Memory	Flash (firmware) + EEPROM (motor-nameplate & protection settings, event log)
Supply Voltage	Via SPAJ relay internal PSU: 24 V DC or 88–264 V AC/DC (wide-range, depends on SPAJ host variant)
Protection Functions (executed on board)	Thermal overload (I²t with motor heating/cooling memory), Stall/Locked rotor, Ground fault (50N/51N), Phase unbalance, Undercurrent, Trip & Alarm logic
Communication	RS485 Modbus RTU (via SPAJ rear port; optional Profibus DP via daughter)
Event Buffer	≥ 100 events with time-stamp (SPAJ relay-level spec, stored on ABB 1MRK000005-63 EEPROM)
Self-Monitoring	MPU watchdog, EEPROM checksum, RAM test, ADC self-cal — faults reported on SPAJ front LEDs
Operating Temperature	-25 °C to +55 °C (inherited from SPAJ host)
Storage Temperature	-40 °C to +70 °C
Mounting	Plugs into SPAJ relay internal backplane (guided card cage + front screw)
Dimensions (board only)	≈ 100 × 70 × 20 mm (SPAJ internal form factor)
Weight	≈ 0.08 kg
Certifications	CE, IEC 60255, UL (inherited from SPAJ host)

Main Features and Advantages

32-bit MPU running SPA protection library:The ABB 1MRK000005-63 executes ABB’s SPA motor-protection algorithms — not just a thermal bi-metallic emulation, but a true I²t model with motor heating/cooling time-constants, stall detection with definite / inverse time curves, ground-fault sensitivity down to 10 % of FLA, and phase-unbalance tripping. On a 250 kW compressor motor, the ABB 1MRK000005-63 can distinguish a genuine locked-rotor (6× FLA, flat) from a harmless in-rush (6× for 0.2 s then decays) — the thermal memory and stall-curve prevent nuisance trips that a dumb overload relay would throw. The 32-bit MPU also runs the SPAJ’s self-monitoring: watchdog, EEPROM checksum, RAM/ADC self-test — if the ABB 1MRK000005-63 detects an internal fault, it forces the SPAJ’s “Err” LED and the relay’s trip relay can be wired to fail-safe (de-energise the contactor) per the plant’s SIL/PRA requirement.Event logging and time-stamping:The ABB 1MRK000005-63 buffers ≥ 100 protection events (trip, alarm, self-monitor, setting change) with 1 ms resolution time-stamps (clock sourced from the SPAJ’s internal oscillator, sync-able via Modbus if the plant DCS periodically writes the time). When a 1.2 MW feedwater-pump motor trips at 3 AM, the maintenance engineer connects ABB SPAsoft (or reads the SPAJ’s front LED codes) and sees: “Stall — 5.8 × FLA — t = 2.1 s” in the ABB 1MRK000005-63 event buffer — no guessing whether it was a mechanical jam or a voltage sag. For plants still on SPAJ (many WWTPs, CHP aux, marine), this event buffer is the primary forensics tool, and it lives on the ABB 1MRK000005-63 EEPROM.RS485 Modbus + optional Profibus:The ABB 1MRK000005-63 itself carries the RS485 transceiver; the SPAJ relay’s rear Com port is wired to the ABB 1MRK000005-63 header. Baud, parity, slave address are set via the SPAJ front push-buttons (or SPAsoft). For plants on Profibus DP, ABB offers a Profibus daughter that plugs onto the ABB 1MRK000005-63 (or onto the SPAJ backplane alongside it — sub-rev dependent); the ABB 1MRK000005-63 MPU talks to the daughter over the internal bus. This means the same ABB 1MRK000005-63 spare works for both Modbus and Profibus fleets if the daughter is separate — another reason the SKU is high-value in mixed-protocol plants.EEPROM parameter retention:Motor-nameplate data (FLA, service factor, heating time-constant τ₁, cooling τ₂, curve class, trip delays) and the protection enable/disable map live in EEPROM on the ABB 1MRK000005-63. On a board swap, if the EEPROM is a separable tiny daughter (some SPAJ sub-revs have it piggybacked on the ABB 1MRK000005-63, others have it on the backplane — verify per plant’s SPAJ revision), transferring the old EEPROM to the new board preserves the settings — the tech doesn’t spend 20 minutes re-punching 15 parameters on the SPAJ front push-buttons. If the EEPROM is on-board, SPAsoft can upload the .spa file to the new ABB 1MRK000005-63 in <2 minutes via the RS485 port. Either way, the “plug-and-go” story holds — unlike a whole-SPAJ replacement which needs re-terminating CT/VT cores and re-commissioning the trip test.Common across SPAJ 110/130/140:ABB kept the ABB 1MRK000005-63 CPU stable across the SPAJ 110C (basic), 130C (adds differential), 140C (adds voltage/sync elements) — the variant differentiation is via the plugged-in analog daughter (CT/VT input stage) and the optional communication daughter. That means a plant with 20 SPAJ 110Cs on pumps + 5 SPAJ 130Cs on compressors + 2 SPAJ 140Cs on genset-motors can stock ONE ABB 1MRK000005-63 spare for all 27 relays. The analog daughter (e.g., 1MRK000006-xx) and the Com daughter (1MRK000007-xx) are the separate SKUs if those also fail — but the CPU is shared. For spare-parts buyers, that commonality is the economic argument: one SKU covers a heterogeneous SPAJ fleet.Compact, shielded, DIN-envied:The ABB 1MRK000005-63 is a 2-layer (maybe 4-layer) PCB with EMI shield can over the MPU/oscillator, conformal coated for humidity (WWTPs, marine engine rooms). It lives inside the SPAJ’s IP51 (front) / IP20 (back) DIN case, so it never sees washdown directly — but the coating handles the vapor in a pump station switchgear room. The board’s front screw doubles as EMI shield ground to the SPAJ chassis — small detail, but it’s why SPAJs pass the 3 V/m EMC tests that cheaper relays fail.