For those who use inverters, Fuji is a brand that’s likely familiar. It has captured a large portion of the Chinese inverter market due to its user-friendly operation and excellent cost-performance. However, as time passes, many of these widely used inverters have entered a high-risk phase for faults. When an inverter fails during daily operations, it becomes a critical challenge for technicians to quickly identify and resolve the issue. In this article, we’ll explore some common problems with Fuji inverters and provide practical solutions that can help users troubleshoot effectively. Over nearly two decades, Fuji inverters have evolved significantly in terms of design, circuit technology, and component integration. The product line has expanded from the early 2 series to the current 11 series, including general-purpose G series, P series for fans and pumps, E series for simple applications, K series, and the ultra-compact C series tailored for different load conditions. There's also the VG3 inverter designed specifically for elevators. Additionally, high-power models like the G7 and P7 (over 30kW) are available, along with various option cards such as dry contact relay output cards, digital/analog interface cards, PG feedback cards, and dual motor synchronous cards. These options ensure that the inverters meet the needs of a wide range of users and form the foundation for ongoing development. OC1, OC2, OC3 Faults One of the most common issues in Fuji inverter repairs is the OC1, OC2, OC3 fault, which indicates overcurrent during acceleration, deceleration, or constant speed. This fault can be caused by several factors: Switching Power Supply Damage A clear sign of switching power supply failure is when the inverter doesn’t power up. For example, the G5S uses a two-stage power supply that converts DC voltages and distributes multiple outputs. Common failures include switch tube breakdown, pulse transformer damage, and faulty rectification diodes or capacitors. The G9S model uses a specialized waveform chip, which can be difficult to replace due to limited availability. Rectifier Bridge Damage The rectifier bridge is another common point of failure. Models like G7S use thyristor-based modules, while G9S integrates thyristors and switches. Damaged bridges often relate to external power issues, so checking peripheral equipment is essential before powering up again. LV and OV Faults Undervoltage (LV) and overvoltage (OV) are also frequent issues. These can stem from power supply problems or internal detection circuit malfunctions. Some models use custom thick-film chips for voltage detection, while others sample directly from the main DC bus. In addition to these, other motherboard-related errors like Err, Er1, Er7, and Er3 (common in Toshiba CT systems) may occur. While each inverter has unique characteristics, the underlying principles are similar. Continuous practice and experience are key to identifying and solving problems efficiently. Shanghai Sanguang Digital Technology Co., Ltd. stands out in the repair industry, offering strong technical support and partnerships with companies like Hong Kong Hengfa Technology. They specialize in repairing integrated circuits, cold chips, current/voltage sensors, and providing a wide range of electronic components to support maintenance work. We offer a premium quality range of 520 mm Width Swan Neck Type Radiator in the market. This is sturdily fabricated using superior grade material and modern machinery in sync with set industrial norms and standards. 520 mm Width Swan Neck Type Radiator is known for its high efficiency, easy installation, low maintenance and better durability. This makes it stand apart from other radiators in the market. We offer this at highly pocket- friendly prices within a stipulated period of time. Swan Neck Radiator,Leakage Proof Swan Neck Radiator,Weather Proof Swan Neck Radiator,Anti Corrosion Swan Neck Radiator Shenyang Tiantong Electricity Co., Ltd. , https://www.ttradiator.com
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