Siemens inverter E alarm troubleshooting analysis

Professional maintenance Taiyuan inverter repair, Taiyuan Siemens inverter repair, Taiyuan Fuji inverter repair, ABB inverter repair, LG inverter repair, Shanxi inverter repair, Shanxi touch screen repair, Shanxi LCD monitor repair. When the letter “E” is displayed on the LCD screen of the Siemens 6SE70 inverter control panel, the inverter cannot work. Pressing the P button and restarting and sending power are invalid. Check the operation manual for no relevant introduction. When checking the external DC24V power supply. The voltage is found to be low. After the solution is completed, the inverter works normally. However, the "E" alarm is generally caused by damage to the CUVC board. It is normal to replace a CUVC board. The "E" alarm is caused by the failure of the backplane and the CUVC communication board. Shanxi inverter repair failure phenomenon: operation control panel PMU LCD display "E" alarm.
Check processing: Replace a new CUVC board to power on, the LCD still shows “E” alarm, indicating that the cause of the fault is not on the CUVC board but on the backplane. Check the backplane, use a digital multimeter to measure the external DC24V voltage is normal, the detection block N3 reference voltage is not normal, the output voltage of the integrated block N220 pin is 0.1V, obviously low, the normal value is 15V, check the integrated block N2 1 foot is 11.3V The 8 pin is 0.20V, and the 11 pin power input is 27.5V, which is normal. After analysis, it is judged that 1 foot, 8 feet, and 20 feet are not normal. The voltage of pin 1 of the test integrated block N3 is 0.31V, the voltage of the pin 2 is 1.8V, and the voltage value is also low. Remove the N3 integrated block MC340 with a heat gun and measure the resistance between pin 2 and pin 3 to 84 ohms. After replacing a new N3 integrated block MC340, test the voltage of each pin, 1 pin is 2.1V, pin 2 is 5.1V, normal. The voltage of each pin of the N2 integrated block is also restored to normal. The output voltage of the integrated block N3 is abnormal, causing the voltage of each pin of the N2 integrated block to also shift. Restore the inverter input parameters and start the inverter to run normally. Shanxi Taiyuan inverter repair http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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