Device investigation narrative - one powermax elite motor drive unit, part number 72200616 was received on july 14, 2017 and confirmed to be serial number (b)(4) as reported in the complaint.The reported complaint of shorting out could not be confirmed.Product did not short out during functional testing.Unit was tested at speed settings between 100 and 10,000 rpm¿s in forward and reverse for 5 minutes each.Also oscillate for 5 minutes in highest setting (9).Product was tested on a known good dyonics power, dii, and dii eip control units with and without footswitch.At no time did mdu short out or overheat.All functions perform as expected.The complaint was not confirmed and the root cause could not be determined since the reported malfunction could not be duplicated during the functional testing process.(b)(4).
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