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Siemens 6SE70 inverter F026 fault analysis
In energy-saving inverters, the Siemens 6SE70 series is commonly used in industrial applications. One of the frequent faults encountered is the F026 alarm, which can occur during startup or while running. In some cases, the alarm can be reset by pressing the P key, but in others, it remains persistent and cannot be cleared. This fault is typically related to the current detection circuit, which is monitored by the driver and transmitted to the CUVC board via an optocoupler. When a fault is detected, the small signal current detection circuit triggers a protective shutdown, blocking the pulse output.
Based on real maintenance experiences, here are some common causes and solutions for the F026 fault:
1. **F026 during start-up – Cannot be reset**
This often indicates a loss of drive pulse or a self-test failure in the current monitoring system. The issue may stem from a faulty driver circuit, where one of the multi-channel components fails, leading to poor performance. In some cases, the IGBT trigger may be damaged, causing increased resistance. Additionally, a short circuit or ground fault in the connected motor can also trigger this alarm. It's important to check the motor and wiring for any signs of damage or insulation breakdown.
2. **F026 after power-on – P key does not reset**
This scenario usually occurs when the inverter has been idle for several days. Upon restart, environmental factors such as high humidity, moisture, or excessive dust on the circuit boards can cause component shorting. These conditions may result in false readings from the detection circuit, triggering a false F026 alarm. The most effective solution is to clean the machine thoroughly, remove dust, and dehumidify the environment. In many cases, this resolves over 80% of the issues. If the board still shows an error, it’s worth checking whether the ±15V power supply is stable and if the driver is functioning properly.
3. **CUVC board chip failure – Causes F026**
In some cases, the F026 alarm is due to a damaged detection chip on the CUVC board. Replacing the affected chip or swapping the entire board with a known good one can resolve the issue.
If you encounter persistent F026 faults or need further assistance, feel free to contact Siemens support directly at 400-810-4288. This information is based on field experience and should be used as a reference for troubleshooting purposes only. Always ensure proper safety precautions are followed when working with electrical equipment.