What causes the alarm to be reset?

Start the alarm on alarm F026, or power on the alarm F026, sometimes it can be operated after reset, or press the P key to reset it. According to the maintenance example, summarize some experience, analyze the fault and simple on-site exclusion for reference only. Siemens 6SE70 inverter alarm F026 F026 fault detection circuit is driven sampling, feedback to the CUVC circuit board through the optocoupler, small signal current detection circuit automatic protection, block pulses.

1, run start to report F026, can not be reset

The fault is manifested in the loss of the drive pulse, self-test alarm of the current Z, and the circuit originals are mostly poor performance of the single drive ceramic chip, and the internal trigger of the IGBT is damaged and the resistance is increased. Peripheral motor short circuit, ground fault will cause fault alarm.

2, start the alarm F026, press the P key can not be reset

This situation occurs more often after the machine is stopped for a few days. When the power is turned on, it is reported as electricity. Due to the bad environment, lack of maintenance, the environment is humid, and the moisture is too high. I parallel resistors cause false alarms in the detection circuit. Usually the processing method is to remove the machine, remove dust and dehumidify. Basically 80% failure is eliminated. If the circuit board is supplied with plus or minus 15 voltages, it will be reported when the drive is not working.

3, CUVC circuit detection chip damage will alarm F026, can be eliminated by alternative methods.

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