Is it possible to check the DC bus capacitors of the Altivar 71/61 drive.

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Yes, it is possible to check the DC bus capacitors. Perform this test only if the converter bridge and inverter bridge tests are good.
Test the capacitors using a multi-meter in ohmmeter mode between the terminals PC and PA.
The resistance should begin at a low level and should increase progressively (as the capacitors charge).
If this does not happen, the charging resistor or the capacitors are defective.