AVR- Marine Generator troubleshooting Vietnam

Bulk Carrier NS QINGDAO is currently located in the Philippines (reported 13 hours, 56 minutes ago.

What kind of ship is this? NS QINGDAO (IMO: 9567439) is a Bulk Carrier and is sailing under the flag of Marshall Is. Her length overall (LOA) is 189.99 meters and her width is 32.26 meters.

Port of Service: Hongai anchorage, Vietnam

Service Provider: Bacviet Commercial and Shiptechnical Joint Stock Company

Work Performed: AVR and Main Electric Board Troubleshooting, Repair of Generator No.1

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Detailed Troubleshooting and Repair Process

Upon receiving the service request, Bacviet arranged port authority permits and boarding passes for a team of three highly trained marine electrical technicians from Hai Phong City to access the vessel at Ha Long anchorage.

Initial Inspection and Fault Diagnosis

The job began with a comprehensive inspection and performance test of Generator No.1. Our technicians identified a critical issue: the output voltage was extremely low (approximately 40V) and could not be adjusted to the standard operating voltage of 480V.

This kind of malfunction usually points to problems within the AVR system or the generator's excitation circuit, both essential for maintaining voltage stability and safe power distribution onboard.

AVR and Main Electric Board Check

The team proceeded to test the AVR (Automatic Voltage Regulator) and power control connections inside the Main Electric Board. A substitute AVR was installed temporarily for diagnostic purposes, which helped pinpoint damaged internal components within the existing AVR unit.

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Key Repair Actions Taken:

• Repaired the AVR Block and replaced the faulty AVR electronic circuit
• Repaired the 4EP39 Reactor by adjusting the air gap distance, ensuring proper magnetic field alignment
• Reset and calibrated the generator voltage output
• Conducted load tests in both single and parallel generator modes
• Verified smooth operations in both manual and automatic running modes

These actions successfully restored the generator voltage to optimal levels and ensured the generator system was fully operational, maintaining safe and stable power for the ship’s electrical demands.

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Final Testing and Result

After completing all repairs and calibration, Generator No.1 was thoroughly tested under various operational conditions. The voltage regulation system, including the new AVR circuit and reconditioned reactor, passed both single and parallel load tests without issue. The main electric control board was also verified for stability and functionality.

Conclusion:

The Generator No.1 on MV NS QINGDAO was fully restored to proper working condition after successful AVR and main electrical board repair. The voltage output is now stable at 480V, and the system runs smoothly in both automatic and manual modes.

Why Choose Bacviet for Marine Generator Troubleshooting in Vietnam?

Bacviet Commercial and Ship Technical JSC provides comprehensive marine electrical and mechanical services throughout Vietnam. Our service coverage includes:

• Troubleshooting marine generator problems, including AVR faults and low voltage output
• AVR replacement and reconditioning
• Repair of main switchboards, power panels, and control systems
• Emergency repairs at anchorage zones such as Hon Gai, Phu my, Cai Mep, Nghi son an Dung Quat Ports and more
• Authorized port access permits and technician boarding services
• Support for both international and domestic vessels

Our team is available 24/7 for emergency troubleshooting of diesel generators, alternators, auxiliary engines, and marine control systems.

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