Nabtesco MG-800 ADU-120A-L Ship Main Engine Electronic Speed Control System Actuator

Product Description

Nabtesco (NABCO) MG-800 ADU-120A-L is the Actuator Drive Unit of MG-800 marine main engine electronic governor system, wall-mounted servo drive enclosure. It receives governor command signal from GCB main control board, amplifies signal via PWM power stage to drive fuel rack electric actuator, and collects actuator position feedback to form closed-loop position control of fuel actuator. It integrates power drive board, power supply circuit, signal conditioning and fault diagnosis circuit. It provides detection and alarm for actuator overload, wire break and power failure. The suffix L stands for left-side / left type variant. It matches MG-800II governor system, supplies high-power servo drive for fuel actuator of 2-stroke marine main engine. Designed for harsh engine room environment with salt mist and vibration, approved by marine classification societies.

Specifications

• Model: MG-800 ADU-120A-L
• Brand: Nabtesco (NABCO)
• Type: Actuator Drive Unit (ADU servo drive cabinet)
• System: MG-800 / MG-800II Marine Diesel Electronic Governor System
• Command Input: Speed control signal from GCB main control board
• Output: PWM power drive for fuel rack electric actuator
• Feedback: Actuator position feedback signal acquisition
• Power Supply: Main AC100/110V (50/60Hz); auxiliary control DC24V
• Mounting: Engine room wall mounting
• Enclosure: Sealed steel cabinet, marine moisture & dust resistant construction
• Protection Rating: IP54
• Operating Temperature: -10℃ ~ +60℃
• Storage Temperature: -20℃ ~ +70℃
• Relative Humidity:5%~95%, non-condensing, salt mist resistant
• Vibration & Shock: Compliant with marine engine room equipment standard
• Diagnostics: Self-check for actuator overload, cable break, power fault with dry contact alarm output
• Certifications: DNV, LR, NK and other major marine classification society approvals
• Weight: approx.18kg
• Features: PWM servo power amplification, actuator closed-loop position control, overload protection, fault alarm, marine anti-corrosion sealed cabinet

Application

Matched with GCB-101-02 main control board for MG-800 electronic governor system of large 2-stroke main propulsion diesel engines on ocean-going vessels. It amplifies speed regulation command from main controller and drives fuel rack actuator to precisely adjust fuel supply quantity for closed-loop control of engine speed and load. It continuously monitors drive loop status and triggers alarm & protection on overload or cable failure. Installed on engine side inside engine room, it acts as the core power drive unit linking governor control board and fuel actuator. Widely adopted in main engine remote control governor systems for bulk carriers, tankers and container ships.

Series Models (MG-800 ADU Drive Unit Series)

1. ADU-120A-L: Left type actuator drive unit
2. ADU-120A-R: Right type actuator drive unit
3. ADU-120-R: Standard actuator drive cabinet
4. GCB-101-02: MG-800II Governor Main Control Board
5. GCB-103: On-board actuator drive PCB
6. EAR-120A: Integrated electronic governor actuator assembly
7. MCG-771: New generation Nabtesco marine electronic governor controller