MG-800 ADU
NABCO / Nabtesco
Refurbished
| Manufacturer | NABCO Ltd. (now Nabtesco Corporation), Japan |
| Product Name | MG-800 Governor System Actuator Drive Unit (ADU) |
| System | NABCO MG-800 digital electronic governor for marine diesel engines |
| Supplied With | JB-GOV governor junction box (NABCO) with connectors and cables, as shown in the photograph |
| ADU Model Number | Not clearly visible in the supplied photograph (known MG-800 drive units include ADU-120A-R and ADU-500A-R) |
| Internal Module (photographed) | Type GPAR-24NTS1, Ser. No. D1112361, Date 20.10 (as marked; label partly faint) |
| Internal Noise Filter | Okaya 3SUP-H20H-ER-4, 3-phase, 250 V AC, 20 A, 50/60 Hz, Made in Japan |
| PCB / Board Numbers | Not clearly visible in the supplied photograph |
| Country of Manufacture | Japan (as marked on internal components); unit itself not verified |
| Equipment Type | Marine engine automation – electronic governor |
| Condition | Refurbished |
The NABCO MG-800 Actuator Drive Unit is the power stage of the MG-800 digital electronic governor system, one of the most common governor systems on large two-stroke main engines built in Japan and Asia. It receives the speed-control command from the governor control unit and drives the electric governor actuator that moves the engine’s fuel rack.
NABCO, today part of Nabtesco Corporation, introduced the MG-800 series in 1987 for large low-speed diesel engines, and hundreds of systems are still in service on bulk carriers, tankers and container ships. SM MARINE SERVICE™ supplies refurbished MG-800 actuator drive units, junction boxes and governor spare parts worldwide – send your inquiry through https://www.smmarineservice.com/.
A digital governor system controls main-engine speed by adjusting fuel. In the NABCO/Nabtesco system, a governor control unit in the engine control room calculates the required fuel index from the speed set-point and the actual speed measured by a pulse generator / pick-up on the engine. The actuator drive unit (ADU) converts this command into motor power for the electric governor actuator (EAR series), which turns the fuel linkage.
The ADU is typically installed in the engine control room or workshop, and connects to the actuator and sensors through a junction box such as the JB-GOV supplied with this unit.
Front of the NABCO MG-800 Governor System Actuator Drive Unit.
| System | NABCO / Nabtesco MG-800 digital governor |
| Unit | Actuator Drive Unit (ADU) |
| Noise Filter Rating | 3-phase 250 V AC, 20 A, 50/60 Hz, -25 to +50 °C (Okaya 3SUP-H20H-ER-4) |
| Noise Filter Leakage Current | 1.0 mA max. (Okaya data) |
| Internal Drive Module | GPAR-24NTS1 – electrical rating not verified |
| Power Supply of ADU | Not verified – check unit nameplate / drawings |
| Matching Actuators (MG-800 family) | EAR-20, EAR-100, EAR-120 / EAR-120A, EAR-500 / EAR-500A, EAR-1000 / EAR-1000A (match must be confirmed) |
| Actuator Stroke (Nabtesco data) | 42° max. for EAR series; EAR-100: 135 N·m, 44° |
| Enclosure | Painted steel cabinet, wall mounting |
The following components were identified inside the photographed actuator drive unit or belong to the MG-800 system:
Heat-sink mounted module inside the ADU, label: TYPE GPAR-24NTS1, SER. No. D1112361, DATE 20.10. Its exact function (servo amplifier / power module) and manufacturer are not verified; please send the full label if you need an exact match.
Internal module label: TYPE GPAR-24NTS1, SER. No. D1112361, DATE 20.10.
Three-phase EMI/RFI filter (3 × 5.0 mH, 6 × 0.47 µF X2, 3 × 3300 pF Y, 3 × 470 kΩ bleed resistors), 250 V AC, 20 A, 50/60 Hz, -25/+50 °C, UL/CSA marked, Made in Japan. Suppresses electrical noise between the ship’s supply and the drive electronics.
Drive and interface circuit boards inside the ADU. Board numbers are not clearly visible in the supplied photographs – not verified.
NABCO governor junction box connecting the ADU with the actuator, pick-up and control unit via multi-pin connectors.
Inside the actuator drive unit: GPAR-24NTS1 module on heat sink and Okaya 3SUP-H20H-ER-4 noise filter.
Safety: the cabinet carries “Voltage may cause electric shock” warnings. Switch off power before checking, and never operate with the door or protective cover open. Changes to the governor system must be coordinated with engine control procedures and the engine maker.
SM MARINE SERVICE™ supplies NABCO / Nabtesco MG-800 actuator drive units, junction boxes, governor control units, EAR actuators and internal modules to ships worldwide. Depending on availability, we can offer refurbished, used, reconditioned or new equipment.
For an accurate quotation please send:
Availability and condition are confirmed with the quotation. Contact us via www.smmarineservice.com.
The MG-800 governor is built into the engine control system of many vessels, with matching actuator, control unit, cabling and settings approved together with the engine maker. Replacing a faulty ADU with the same type keeps the complete governor system, parameters and approvals unchanged – avoiding a costly governor retrofit and long off-hire time.
The power drive unit of the MG-800 digital governor that drives the electric governor actuator on the main engine.
NABCO Ltd., now Nabtesco Corporation, Japan.
The MG-800 family uses Nabtesco EAR-series actuators such as EAR-100, EAR-120A, EAR-500A and EAR-1000A; the correct ADU/actuator match must be confirmed.
It is the type marking of a module found inside the photographed ADU (Ser. No. D1112361). We can source this module or a complete ADU on request.
An Okaya 3SUP-H20H-ER-4, 3-phase, 250 V AC, 20 A EMI filter.
Yes, the photographed set includes the NABCO JB-GOV junction box with cables.
They are MG-800 actuator drive unit versions matched to different actuator sizes.
Typical causes are loss of ADU power, a failed drive module, connector faults or an actuator fault.
Yes, MCG-series control units and other MG-800 parts can be quoted subject to availability.
Yes, SM MARINE SERVICE™ arranges worldwide shipping to vessels and ports.
The NABCO (Nabtesco) MG-800 Governor System Actuator Drive Unit is the power stage of the MG-800 digital electronic governor used on marine low-speed diesel main engines. It drives the EAR-series electric governor actuator according to commands from the governor control unit. This set includes the JB-GOV junction box; inside the unit are a GPAR-24NTS1 module and an Okaya 3SUP-H20H-ER-4 noise filter. SM MARINE SERVICE™ supplies refurbished MG-800 drive units and governor spares worldwide – contact us for availability and price.
SM MARINE SERVICE™
Marine Automation & Navigation Equipment Supplier
Available Equipment Conditions: New • Used • Refurbished • Reconditioned
Specific product condition and availability are subject to confirmation.
Stock Locations: Bangladesh • China
Services: Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing
Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: https://www.smmarineservice.com/
Need an MG-800 actuator drive unit, actuator or governor spare part? Send us your requirement today for a fast quotation and worldwide delivery.
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