Siemens Siemens inverter repair troubleshooting tables on the drive in the operating manual are all more common faults introduced in some code that does not involve the response to the drive for a comprehensive examination. Maintenance mode voltage converter using online detection and two methods of DC resistance measurement, measuring voltage and the key points are compared with the normal, narrow the fault, analyze and judge; DC resistance measurement components, according to the chip resistor color ring comparative judgment, and then the suspect components removed, and then measure the DC resistance of components to determine the quality of the components by comparison. When the letter "E" "E" warning appears on the LCD display alarm on the display inverter operation control panel 2.1 Siemens 6SE7016-1TA61-Z PMU LCD inverter, the inverter does not work, press P to stop and re-send electricity are invalid, check the operating manual nor related to the introduction, when checking the external DC24V power supply, low voltage is found, resolved, the drive is working properly. But the emergence of "E" in general alarm CUVC board is damaged, replace a new CUVC board can be normal. "E" is an alarm in the following situations from the floor and CUVC communication board failures caused by: (1) Symptom: SIEMENS inverter repair PMU operator control panel LCD display shows "E" alarm check processing (see Figure 1, Figure 2): Replace it with a new delivery CUVC board is powered on, the LCD screen still shows "E" alarm, indicating that the cause is not CUVC board in the floor. Check the floor, with a digital multimeter external DC24V voltage is normal, testing manifold N3 reference voltage is not normal, manifold N2 20-pin output voltage of 0.1V, is significantly lower, normal value should be 15V, check manifold N2 1 foot for 11.3V, 8 feet 0.20V, 11 foot power input is 27.5V, normal. The analysis to determine a foot, 8 foot, 20-pin voltage is not normal. Manifold N3 measured 1 foot voltage is 0.31V, 2 pin voltage is 1.8V, the voltage values ??are low. N3 with a heat gun to remove Manifold MC340, resistance measured between 2 feet and 3 feet of 84Ω. After replacing a new N3 Manifold MC340, measure the voltage of each pin, a pin is 2.1V, 2 feet for the 5.1V, normal. Manifold pin voltage measured N2 are also returned to normal. Manifold N3 output voltage is not normal, causing the pin voltage N2 Manifold also appeared offset. Restore a drive connection, input parameters, start the drive is operating normally. (2) Symptom: PMU operator control panel LCD display shows "E" alarm check processing (see Figure 1 and Figure 2): measured with a digital multimeter floor N2, N3 Manifold pin voltage, an 8 foot N2 and N3 pin voltage is low, measured V28 transistor base bias resistor 4.7kΩ has changed is 150kΩ. Replace the new chip resistors, measured N2, N3 pin voltage is normal. Because V28 base bias resistor values ??change, causing the transistor V28 cut, resulting in N2, N3 Manifold does not work. (3) Siemens inverter repair Symptom: PMU operator control panel LCD display panel "E" alarm check processing: one inverter "E" alarm, the inverter CUVC original CBT board communication board is removed, installed In the new CUVC board, inverter installed CUVC board, after startup. LCD display still shows "E" to the police. Remove CUVC board examination found CBT communication board chip resistors burn. After replacing the new CBT communication boards, inverter starts working properly. (4) Symptom: PMU operator control panel LCD display panel "E" alarm check processing (see Figure 1, Figure 2, Figure 4): Check the backplane power block N2 (L4974A) 1 foot boot voltage is 11.32V , normal is 26.7V; 20 pin output voltage is 0.117V, normal is 15.31V; reference voltage block N3 (MC340) 1 pin voltage is 0.315V, normal is 2.1V; the first two legs of the voltage value varies between 1.5 ~ 1.8V, while normal is 5.1V. Check the relay K4, the two diodes in series coil circuit V16, V15, resistance values ??were 3.67Ω and 5.5Ω, has been short-circuited, V28 (5C) transistor base resistance by normal 4.7kΩ into 150kΩ, already burned. After the replacement of the resistor and diode operating normally. 2.2 Siemens 6SE70 series inverter repair PMU operator control panel LCD display no display, "black" (1) Symptom: Siemens 6SE7016-1TA61-Z Drive PMU operator control panel LCD display "black" Shenzhen Rong. Li & Fung Ltd., the company is specialized in various types of industrial automation products and repair services, primarily servicing the drive Brand: Siemens, Schneider, Omron, Hui Peng, ABB, Mitsubishi, Lenze, Bryant, AB, Fuji, Yaskawa, Panasonic, Toshiba and Hitachi, etc., customers are welcome to inquire, repair time is generally 4-8 working days to sign the formal contract maintenance, quality assurance six months, the same failure occurs during the warranty period, the second does not charge any fees repairs .