Description
Product Overview
The GCB-101-02 is a main governor control printed circuit board manufactured by Nabco (Nabtesco), designed for the marine MG-800 II main engine governor and propulsion control system. It serves as the core logic and signal processing card, handling bridge telegraph commands, throttle lever setpoints, engine speed feedback, safety interlock logic and actuator drive signal output for large marine diesel main propulsion engines. It converts bridge maneuvering orders into speed control commands for the engine hydraulic governor, while monitoring critical engine permissives and fault conditions.
Technical Specifications
| Item | Parameter |
|---|---|
| Part Number | GCB-101-02, 885/7375346 |
| Manufacturer | Nabco / Nabtesco |
| System Family | MG-800 II Marine Governor System |
| Board Type | Main Governor Control PCB |
| Power Supply | 10–30 VDC, nominal 24 VDC |
| Power Consumption | ~5 W |
| Input Signals | Lever position analog input, speed pickup pulse input, binary interlock / permissive contact inputs |
| Output Signals | Isolated analog / discrete drive outputs for hydraulic governor actuator |
| Conformal Coating | Yes, salt-mist and moisture protection for marine environment |
| Operating Temp | -10 °C ~ +70 °C |
| Humidity | 5%–95% non-condensing |
| Dimensions | 210 mm × 160 mm × 25 mm |
| Weight | ~0.45 kg |
| Mounting | Plug-in rack card for MG-800 control cabinet |
| Diagnostics | Onboard watchdog, fault LED indicators, self-diagnostic error codes |
Key Features
- Core speed governing and maneuvering logic for marine main engine MG-800 II governor
- Receives bridge telegraph and throttle setpoint signals, closed-loop engine speed regulation
- Built-in engine safety interlock logic: overspeed, start inhibit, reverse lock, lube oil permissives
- Conformal coated PCB to resist shipboard salt fog, vibration and temperature cycling
- Multi-channel analog and digital signal conditioning for engine transducers and feedback
- Onboard self-diagnostics with fault LED status for rapid troubleshooting during vessel operation
- Plug-in rack design for convenient onboard replacement during drydock or maintenance
- Matches with other MG-800 series auxiliary cards to form complete propulsion control rack
Application
Exclusively used onboard cargo vessels, tankers and bulk carriers equipped with Nabco MG-800 II main engine governor. Installed inside the engine room governor control cabinet, it executes bridge-to-engine room speed command transfer, main engine speed control and propulsion safety interlock protection for large two-stroke marine diesel engines.
Installation & Maintenance Notes
- ESD protection must be applied during card removal and insertion
- Record DIP switch and jumper positions before removing the PCB; incorrect jumper settings cause governor trip or speed runaway risk
- Verify 24 VDC supply stability and polarity before powering the card
- Inspect backplane connectors for corrosion and salt contamination (critical for marine spare card replacement)
- Perform speed loop calibration and telegraph function test after replacement
- Keep spare cards stored in dry anti-static packaging away from salt air
- Review fault diagnostic codes during post-replacement commissioning
FAQ
Q: What system does GCB-101-02 belong to? A: It is the main control card for Nabco MG-800 II marine main engine governor system.
Q: Can GCB-101-02 be used for generator governors? A: No, this card is dedicated to main propulsion engine control, not auxiliary generator governor.
Q: Is this board obsolete? A: Nabtesco discontinued original production; only refurbished and surplus spare units are available for marine aftermarket.
Start Chat
Send an Email
