AC/DC Drive Repair Process:

To begin the repair on an AC/DC drive a visual inspection is performed.

Next meters and signature analysis devices are used to component test.
Common failure parts such as capacitors, drive and output transistors, power supplies, SCR’s, and firing circuits are checked first.
Common failure parts are tested and replaced as necessary
Drive is then powered up
While powered up the power supplies are checked as are the outputs for proper wave form
A dummy load is applied to the drive and the output waveform is checked with an oscilloscope
If proper output is seen the dummy load is removed and the drive is fully load tested with the proper motor and with a dynamometer
It is scoped again for proper wave form
Entire unit is cleaned and retested

Industrial Drive Repair and Replacement