YANG MARINE AUTOMATIONElectrical & Automation Repair Specialists

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Parts Catalog

Generator Control & Power Conversion

The parts that keep generator output clean and batteries charged — AVRs, exciter cards, synchronising panels, chargers, and UPS systems.

AVR (Automatic Voltage Regulator)

Regulates alternator output voltage and is one of the more common wear items on a marine generator set. Voltage that drifts or won't hold under load is the classic symptom before outright failure.

Exciter / Excitation Card

Sits between the AVR and the alternator's rotating diode bridge on a brushless generator, carrying the excitation current that ultimately builds the main rotor's field. Diagnosed alongside the AVR, since the symptoms of the two failing overlap almost completely.

Synchronising Panel

Matches voltage, frequency, and phase before a generator parallels onto the bus. A panel that won't sync cleanly gets checked on its own sensing and logic first, before the generator's governor and AVR get blamed.

Battery Charger (Marine)

Keeps starting and control batteries topped up. A charger stuck in boost mode will cook a battery bank just as reliably as one that's stopped charging altogether.

UPS Module

Backs up navigation and alarm systems through a mains interruption. The battery inside typically fails well before the UPS electronics do, so that's the first thing worth checking.

Isolation Transformer

Electrically isolates a circuit for safety or noise reduction — a straightforward part, but we still test it under load instead of passing it on a visual check alone.

SMPS (Switch-Mode Power Supply)

Compact DC supply for control panels and PLC racks. Output capacitors age out gradually, and the first sign is usually intermittent PLC resets, well before the supply fails outright.

Surge Protection Device (SPD)

Absorbs voltage transients before they reach the electronics behind it. If one's taken a hit and needs replacing, that's worth flagging to whoever maintains the panel — it means something upstream surged.