(1) LENZE Inverter Pulse Transformer Damage
For early models like the 8100 and 8300 series inverters, one common issue is damage to the pulse transformer. The symptoms usually include no response when powered on and no voltage at the control terminals. Since the transformer's core is difficult to disassemble, this makes repairs challenging. Each brand uses different parameters for their pulse transformers, making rewinding difficult without proper components. Due to limited market demand, these issues are often not discussed in detail.
(2) LENZE Inverter OC5 Fault
OC5 faults are frequently seen in 8220/8240 series inverters, indicating an overload condition. This is typically detected using a Hall sensor that measures current on the UV phase. The system then evaluates the signal through a gate circuit. Common causes include sensor failure or damage to the gate circuit. Hall sensors can drift due to environmental factors, while gate circuits may be affected by voltage spikes or signal interference. Replacing the faulty components usually resolves the issue.
(3) LENZE Inverter Output Phase Loss
Output phase loss is another frequent fault. In such cases, a three-phase motor cannot start, and an overcurrent alarm may trigger. If the motor is disconnected, measuring the output voltage often shows significant imbalance between phases. It’s essential to check the power module and drive waveform. In 8240 series inverters, the drive circuit may have no voltage, so the switching power supply must be inspected. Unlike other inverters, the 8240 series isolates the drive power from the switching power supply, so checking the isolation transformer is also necessary.
(4) LENZE Inverter Switching Power Supply Failure
Switching power supply failures are common in 8200 series inverters. Key failure points include damaged power transistors and faulty control circuits. Replacing the switch transistor is straightforward, as the original part is usually available. However, repairing the control circuit can be complex, as the components are often mounted on ceramic substrates, making replacement difficult. Experience and technical skills are required for such repairs.
(5) Heat Dissipation Issues in LENZE Inverters
LENZE inverters use heat sink separation technology, which is a key advantage. Traditional inverters rely on cooling fans, which can become a common failure point, especially in environments like textile factories where dust and fibers accumulate. While this design reduces fan-related issues, some units may experience overheating after prolonged use. Poor heat dissipation can accelerate component aging and increase failure rates. In such cases, replacing aged parts can resolve the problem.
Additionally, the LED status on the inverter can help diagnose its condition, especially when the panel is not accessible. A green light on and red off indicates normal operation. A flashing green and red light means the panel is disabled. If the green light is off and the red flashes once per second, the inverter is in a fault state.
LENZE inverters may still face various issues during operation. Their wiring is complex, and PCBs often feature multi-layer designs, requiring skilled technicians. We hope professionals in the field can share more knowledge and work together to solve real-world problems.
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