I was looking into a ABB VFD fault tracing document and I found this important note "After
disconnecting the input power, always wait for 5 minutes to let the
intermediate circuit capacitors discharge before you start working on the
drive, motor or motor cable. Always ensure that there is
no voltage between the braking resistor terminals (BRK+, BRK-) and the frame".
Now my questions are:
What are these intermediate circuit capacitors?
The voltage across breaking resistor, is this due to the concept of back emf of the motor?
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