So the 10hp motor might not turn over as fast anymore and caused
excessive current to flow, blowing up the VFD. Dirty bearings maybe
just got enough. The load was applied when it was designed to be
off and turned on once the motor was up to speed...

Was the motor shorted ? is there a shorted winding and just sat there
in a stall current to long ?

Think of the SYSTEM LLoyd - not just the source. You might buy 2 or 3
VFD's yet.

Now if the VFD is turned on with the motor disconnected, there might be
another issue. And so forth.


Martin

On 6/26/2016 6:40 AM, Lloyd E. Sponenburgh wrote:
Martin Eastburn fired this volley in
:

Try to understand why it blew - is it under strain due to dry shafts ?
Wrong lube or something causing more back pressure ... Might be
important to check first - less you buy another in due time.


It's 12 years old, used 8 hours a day, daily for 8years of that, and thrice
weekly for the last 4. "Dry Shafts"? "Back pressure"? "Wrong Lube"? This
is a VFD. A 10HP spindle driver.

It blew up upon application of power, not while cutting.

LLoyd