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Key Technical Specifications
| Parameter | Specification |
| Model Number | MCA-901-11 |
| OEM Part Number | 885 73748388 |
| Manufacturer | NABCO (Nabtesco Corporation) |
| Primary Application | Marine main engine remote control system & bridge telegraph interlock |
| Board Function | Central command decoding, safety monitoring, and actuator drive logic |
| Supply Voltage | 24 V DC (±10%) |
| Input Channels | Opto-isolated digital inputs for bridge/ECR levers, limit switches, and safety alarms |
| Output Channels | Relay contacts and analog speed-command outputs for governor drives |
| Operating Temperature | -10°C to +70°C (14°F to 158°F) |
| Environmental Protection | Heavy-duty conformal coating against salt mist, humidity, and engine vibration |
| Weight | 0.52 kg (1.15 lbs) |
Product Introduction & Supply Chain Strategy
The NABCO MCA-901-11 885 73748388 is a central logic processor board engineered for NABCO marine propulsion remote control systems. Installed in the main engine control rack, it interprets commands from the bridge control head and ECR console, executing interlock logic, order handshakes, and speed signal distribution to main engine pneumatic or electronic governors.
Maintaining this unit as a New Surplus spare is a critical risk-mitigation step for commercial ship operators and fleet maintenance engineers. Failure of an MCA-series main processing card causes total loss of remote engine control, resulting in immediate vessel port detentions and costly off-hire hours. Sourcing genuine New Surplus guarantees original factory component integrity and fresh capacitors, completely avoiding the high failure rates associated with refurbished boards while bypassing long OEM production lead times.
MCA-901-11
MCA-901-11
MCA-901-11
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Power Isolation: De-energize the 24V DC main and auxiliary power feeds to the engine control cabinet. Confirm zero voltage using a calibrated multimeter.
- ESD Protection: Attach a grounded ESD wrist strap before touching the PCB surface or backplane connectors.
- Record Settings: Take clear photographs of all DIP switch banks, jumper positions, and cable connector labels on the existing board.
Stage 2: Removal
- Unclip card-edge wire harnesses and unscrew lock-screws on multi-pin sub-D or terminal block connectors.
- Loosen retaining chassis fasteners on the mounting rack frame.
- Carefully draw the board out horizontally along its guide rails to avoid bending rear backplane interface pins.
Stage 3: Installation (Clone & Seat)
- Match and duplicate all onboard DIP switches, Rotary switches, and jumper links from the old board onto the replacement MCA-901-11.
- Align the replacement module with the rack guide channels and push firmly until backplane connectors press fully into place.
- Tighten mounting chassis screws to 0.8 N·m to guard against continuous vessel vibration.
Stage 4: Power-On & Testing
- Restore 24V DC supply power. Verify the main power and system status LEDs illuminate solid green without fault indications.
- Perform a stationary command loop test between Bridge, ECR, and local control stations.
- Confirm proper execution of start, stop, ahead, and astern interlock signals.
Firmware/Software Versions & Upgrade Notes
- Onboard EPROM Architecture: The MCA-901-11 utilizes factory-flashed microcode on onboard non-volatile memory. Field software flashing or external programming laptops are not required during replacement.
- Part Number Matching: Ensure the sub-assembly part number matches
885 73748388precisely. Variations in middle or end digit groupings indicate alternate I/O channel mappings or system firmware revisions. - Compatibility Warning: Do not cross-substitute MCA-901-11 with earlier MCA-901-01 or MC-603 series modules without reviewing the original vessel electrical schematics, as connector pinout assignments for auxiliary alarms vary between generations.
Frequently Asked Questions (FAQ)
Is this NABCO MCA-901-11 885 73748388 board brand new or refurbished?
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned vessel, and not refurbished. All modules undergo strict quality verification to ensure OEM-level reliability.
Why choose New Surplus over a refurbished marine controller card?
Refurbished circuit boards used in marine automation frequently suffer from capacitor degradation and microscopic solder fracturing caused by years of continuous engine room vibration and heat cycle fatigue. A failed refurbished logic board during vessel maneuvering presents severe safety and financial risks. Buying New Surplus ensures full 10–15 year component longevity and maximum operational reliability.
Does replacing the require specialized field programming?
No laptop programming is needed. System options and operating parameters are cloned directly using the physical DIP switch banks and jumper blocks on the board hardware.
Can this board be swapped while the cabinet power is active?
No. Hot-swapping the can generate voltage spikes across backplane logic lines, potentially damaging sensitive CMOS microprocessors. Always de-energize the cabinet prior to replacement.
What warranty protection comes with this New Surplus board?
Every NABCO card supplied from our New Surplus stock is covered by a 1-year functional replacement warranty.
