Siemens 6SE7026-OTA61-Z inverter control panel PMU LCD displays the "F008" alarm. The symptom is that after starting, the panel shows "F008," and after resetting, it displays "009" during the boot-up process. When a set frequency is applied, the inverter trips again with "F008" after about 20 seconds. The troubleshooting process involves checking the resistance of R209 connected to pin 3 of the voltage and current detection integrated block N1 (TL084), which had increased from 4.7Ω to 888kΩ. Additionally, R203 at the 14th pin showed a similar issue, changing from 4.7Ω to 185kΩ. Replacing these resistors resolved the problem. Another fault occurred where, after power-on self-test, the PMU displayed "FOO8," reset to "OO9," but failed to start. Further inspection revealed that the collector resistor R152 of transistor V17 (5C) in the trigger circuit had a resistance of 1.69kΩ instead of the normal 1.275kΩ (which should be four 5.1kΩ SMD resistors in parallel). One of them was burned out. After replacing the resistor, the system operated normally. In another case, the PMU displayed "FOO8" after power-on, reset to "OO9," and then tripped again with "FOO8" after 20 seconds when a frequency was given. Checking the output resistors R209 and R203 of the N1 (TL084) operational amplifier, both were found to have increased from 47Ω to 888kΩ and 185kΩ respectively. Replacing these resistors restored normal operation. A different issue involved the PMU displaying "F008" after startup, even though the inverter showed "009" during the self-check. Upon inspecting the backplane, the on-line resistance of R56 was measured at 4.3kΩ instead of the normal 900Ω. After removing the resistor using a hot air gun and measuring it off-line, it was found to be open at 1MΩ. Replacing it with a new resistor fixed the problem. Regarding the "F011" alarm on the Siemens 6SE70 series inverter's PMU, one symptom was that the alarm could not be reset. Checking the voltage detection block N1 (TL084), the external 47Ω resistor at pin 7 had changed to 15Ω. Also, the G-pole protection resistor of V2 (IRF520) had increased from 10Ω to 340kΩ. Replacing these components brought the system back to normal. Another F011 alarm case involved a burning smell from the inverter. Measuring the output voltages of N2, pin 20 showed only 5.1V, while pin 1 had 16.5V. Further inspection revealed that the 1kΩ resistor connected to N2 pin 9, the 100kΩ resistor connected to N5 pin 1, and the 10Ω resistor on N5 pin 3 had failed, increasing to 20MΩ and 2MΩ respectively. Additionally, the 4.7kΩ resistor on the trigger board A22 was burned out. Replacing these components resolved the issue. Lastly, for the 6SE7022-6TA61-E inverter, the unit would trip after 10 seconds with "F006" displayed. Initial checks of the bottom board showed no issues. After re-soldering the IGBT module, trigger circuit board A21, transistor V17 (5C), and all related pins, the inverter started up and operated normally.
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