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1, the inverter power supply converter Siemens 6SE70 driver board bad <br> <br> Siemens 6SE70 inverter display converter 24V voltage E is caused by a low, the control terminal is the external line to ensure full disconnection ,, 24V DC Supply, then, to see if the situation is normal, if not normal, you can measure this voltage in the case of connecting 24V, to see if it is normal. If the voltage pull is lower, less than 20V, there is a problem with the power board, not the CUVC problem .
2, the inverter CUVC Siemens 6SE70 Converter circuit board repair bad <br> <br> Case: Siemens 6SE70 inverter control displays the letter "E" alarm, the drive can not work on the liquid crystal display panel PMU, press P And re-stop, send power are invalid, check the operating manual and no relevant description, when checking the external DC24V power supply, found that the voltage is low, after the solution, the inverter works properly. However, the “E†alarm generally indicates that the CUVC board is damaged, and replacement of a CUVC board can be normal. The following cases of "E" alarms are caused by the failure of the backplane and the CUVC communication board. iiX frequency changer maintenance The Siemens 6SE70 frequency changer is widely used in the current market, especially in the large-scale automation project application most. This article describes in detail the "E" fault phenomenon of the 6SE70 series inverter of Siemens.
Siemens 6SE70 inverter panel PMU display letter "E" alarm failure causes (1) Symptom: Siemens 6SE70 inverter panel PMU display letter "E" alarm check processing: Check the backplane power block N2 (L4974A) pin 1 boot voltage is 11.32V, normal value is 26.7V; pin 20 output voltage is 0.117V, normal value is 15.31V; reference voltage block N3 (MC340) pin 1 voltage is 0.315V, normal value is 2.1V; pin 2 voltage The value varies from 1.5 to 1.8V, while the normal value is 5.1V. Check the relay K4. The coil circuit is connected in series with two diodes V16 and V15. The resistance values ​​are 3.67Ω and 5.5Ω, respectively. They have been short-circuited. The base resistance of the V28 (5C) triode has changed from the normal value of 4.7kΩ to 150kΩ and it has been burned out. After replacing the new resistor and diode, it is operating normally.
(2) Failure phenomenon: Siemens 6SE70 inverter panel PMU display letter "E" alarm check processing: an "E" alarm inverter, remove the original CUVC board CBT communication board inverter, installed on the new CUVC board , Converter installed CUVC board, after starting. The LCD still shows the "E" alarm. Remove the CUVC board and check that the chip resistor on the CBT communication board has burned out. After replacing the new CBT communication board, the inverter starts working properly.
(3) Symptom: Siemens 6SE70 inverter panel PMU display letter "E" alarm check processing: replace a new CUVC board power on, the LCD display 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 voltage of the external DC24V normally, detect that the voltage of the integrated block N3 is not normal, and the output voltage of the N220 pin of the integrated block is 0.1V, which is obviously low, the normal value should be 15V, check the pin 1 of the integrated block N2 is 11.3 V, 8 feet is 0.20V, 11 foot power input is 27.5V, normal. After analyzing and judging that the voltage values ​​of the 1st, 8th, and 20th feet are not normal. The voltage of pin 1 of the test block N3 is 0.31V, the voltage of the pin 2 is 1.8V, and the voltage value is also low. Remove the N3 manifold MC340 with a hot air gun and measure the resistance between feet 2 and 3 to 84Ω. After replacing a new N3 manifold MC340, measure the voltage of each pin, one pin is 2.1V, and two feet are 5.1V, normal. Measuring N2 manifold block voltage also returned to normal. The output voltage of the integrated block N3 is not normal, causing the voltage of each pin of the N2 manifold to also shift. Restore the inverter wiring, input parameters, start the inverter running normally.
Inspection and treatment: Use a digital multimeter to measure the voltages of the feet of the backplane N2 and N3 manifolds. The voltage of pin 8 of pin 1 of N3 is low, and the base bias resistor of the V28 transistor has been changed to a value of 150kΩ. Replace the new chip resistor and measure the normal voltage of N2 and N3 pins. Due to the V28 base bias resistance variable value, the V28 triode interception was caused and the N2 and N3 manifolds could not work properly.
2, the inverter CUVC Siemens 6SE70 Converter circuit board repair bad <br> <br> Case: Siemens 6SE70 inverter control displays the letter "E" alarm, the drive can not work on the liquid crystal display panel PMU, press P And re-stop, send power are invalid, check the operating manual and no relevant description, when checking the external DC24V power supply, found that the voltage is low, after the solution, the inverter works properly. However, the “E†alarm generally indicates that the CUVC board is damaged, and replacement of a CUVC board can be normal. The following cases of "E" alarms are caused by the failure of the backplane and the CUVC communication board. iiX frequency changer maintenance The Siemens 6SE70 frequency changer is widely used in the current market, especially in the large-scale automation project application most. This article describes in detail the "E" fault phenomenon of the 6SE70 series inverter of Siemens.
Siemens 6SE70 inverter panel PMU display letter "E" alarm failure causes (1) Symptom: Siemens 6SE70 inverter panel PMU display letter "E" alarm check processing: Check the backplane power block N2 (L4974A) pin 1 boot voltage is 11.32V, normal value is 26.7V; pin 20 output voltage is 0.117V, normal value is 15.31V; reference voltage block N3 (MC340) pin 1 voltage is 0.315V, normal value is 2.1V; pin 2 voltage The value varies from 1.5 to 1.8V, while the normal value is 5.1V. Check the relay K4. The coil circuit is connected in series with two diodes V16 and V15. The resistance values ​​are 3.67Ω and 5.5Ω, respectively. They have been short-circuited. The base resistance of the V28 (5C) triode has changed from the normal value of 4.7kΩ to 150kΩ and it has been burned out. After replacing the new resistor and diode, it is operating normally.
(2) Failure phenomenon: Siemens 6SE70 inverter panel PMU display letter "E" alarm check processing: an "E" alarm inverter, remove the original CUVC board CBT communication board inverter, installed on the new CUVC board , Converter installed CUVC board, after starting. The LCD still shows the "E" alarm. Remove the CUVC board and check that the chip resistor on the CBT communication board has burned out. After replacing the new CBT communication board, the inverter starts working properly.
(3) Symptom: Siemens 6SE70 inverter panel PMU display letter "E" alarm check processing: replace a new CUVC board power on, the LCD display 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 voltage of the external DC24V normally, detect that the voltage of the integrated block N3 is not normal, and the output voltage of the N220 pin of the integrated block is 0.1V, which is obviously low, the normal value should be 15V, check the pin 1 of the integrated block N2 is 11.3 V, 8 feet is 0.20V, 11 foot power input is 27.5V, normal. After analyzing and judging that the voltage values ​​of the 1st, 8th, and 20th feet are not normal. The voltage of pin 1 of the test block N3 is 0.31V, the voltage of the pin 2 is 1.8V, and the voltage value is also low. Remove the N3 manifold MC340 with a hot air gun and measure the resistance between feet 2 and 3 to 84Ω. After replacing a new N3 manifold MC340, measure the voltage of each pin, one pin is 2.1V, and two feet are 5.1V, normal. Measuring N2 manifold block voltage also returned to normal. The output voltage of the integrated block N3 is not normal, causing the voltage of each pin of the N2 manifold to also shift. Restore the inverter wiring, input parameters, start the inverter running normally.
Inspection and treatment: Use a digital multimeter to measure the voltages of the feet of the backplane N2 and N3 manifolds. The voltage of pin 8 of pin 1 of N3 is low, and the base bias resistor of the V28 transistor has been changed to a value of 150kΩ. Replace the new chip resistor and measure the normal voltage of N2 and N3 pins. Due to the V28 base bias resistance variable value, the V28 triode interception was caused and the N2 and N3 manifolds could not work properly.
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