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| Simovert VC 6SE7021-8EB21-Z Incorrect DC link voltage reading repair | |
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Problem description
Repair of a problem where the rectified DC link voltage reading is incorrect on this Siemens Simovert VC inverter.
Symptoms
- Incorrect DC voltage reading
- Measuring with MM yields correct voltage but the inverter measures it incorrectly
- Inverter won't run and low DC voltage error
Solution
On the power board, there is a vertical ceramic resistor that houses 2 resistors inside. Desolder it out and measure both resistors, they should measure the same, if not, you'll need to replace the resistor with an external one. Make sure to use a 1% or less tolerance.