Siemens 6SE7026-OTA61-Z Inverter: PMU LCD Display Shows "F008" Alarm (1) Symptom: The operation control panel PMU LCD displays "F008". After resetting, it shows "009", indicating the system is in boot preparation mode. When the frequency is set and the controller starts, after about 20 seconds, the alarm "F008" reappears. Check & Repair: Inspect the resistance R209 connected to pin 3 of the voltage and current detection integrated block N1 (TL084), which was found to have increased from 4.7Ω to 888kΩ. Similarly, resistor R203 at pin 14 showed a change from 4.7Ω to 185kΩ. Replacing these resistors resolved the issue, and the inverter returned to normal operation. (2) Fault Phenomenon: After the power-on self-test completes, the PMU display shows "FOO8". After a reset, it displays "OO9", but the inverter fails to start. Check & Repair: Examination of the trigger circuit revealed that the collector resistance R152 of transistor V17 (5C) had changed from the normal value of 1.275kΩ (four 5.1kΩ SMD resistors in parallel) to 1.69kΩ. One of the resistors had burned out. Replacing the faulty resistor restored normal function. (3) Fault Phenomenon: After the power-on self-test, the PMU shows "FOO8". After resetting, it displays "OO9", and when the frequency is applied, the inverter trips after 20 seconds with the same "FOO8" alarm. Check & Repair: The external resistor R209 on pin 7 of the operational amplifier N1 (TL084) had increased from 47Ω to 888kΩ. Resistor R203 at pin 14 also changed from 47Ω to 185kΩ. Replacing both resistors fixed the problem. (4) Fault Phenomenon: The PMU display shows "F008" alarm. During power-up self-check, it shows "009" as ready, but then displays "F008" again and cannot start. Check & Repair: While checking the backplane's voltage and current detection, the online resistance of R56 was measured at 4.3kΩ instead of the normal 900Ω. After removing it using a hot air gun, the resistance was found to be 1MΩ, indicating it was burned out. Replacing the resistor restored normal operation. 2.5 "F011" Alarm on Siemens 6SE70 Series Inverter PMU LCD (1) Symptom: The PMU displays "F011" and cannot be reset. Check & Repair: The 47Ω external resistor at pin 7 of the voltage detection block N1 (TL084) had dropped to 15Ω. Additionally, the G-pole protection resistor of V2 (IRF520) had increased from 10Ω to 340kΩ. Replacing both components restored normal operation. (2) Symptom: The PMU shows "F011" alarm, and the inverter emits a burning smell. Check & Repair: Measuring the output voltages at pin 20 of N2 showed only 5.1V, while pin 1 showed 16.5V. Further inspection revealed that the 1kΩ resistor connected to N2 pin 9, the 100kΩ resistor connected to N5 pin 1 had increased to 20MΩ, and the 10Ω resistor at N5 pin 3 had risen to 2MΩ. The 4.7kΩ resistor at the 4th pin of trigger board A22 was also burned out. Replacing these components resolved the issue. 2.66SE7022-6TA61-E Inverter: Trip After 10 Seconds with "F006" Display Check & Repair: Initial checks of the inverter's bottom plate showed no voltage issues. After re-soldering the IGBT module, trigger circuit board A21, and transistor V17 (5C), the inverter operated normally without tripping.
Open Channel Flowmeter,Open Channel Flow Sensors,Hydraulic Open Channel Flow Meter,Open Channel Flow Controllers
Jiangsu Baichuang Instrument Group Co.,Ltd , https://www.subcip.com