Why only 10?
Standard VFD and transformer sizing practices?
- Thread starter paul_arc
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why only 5? You think that is acceptable
10+ if sized properly
it was running at 112%+
I've heard rumors that if ss devices are run at higher than design temps it will decrease their life cycle
seems plausible
We don't know that.
But my point was that it did run for FIVE years, If it was operating significantly beyond specification, and we don't know that it was, one might have expected a fault code to have been flagged up.
yes we do
he measured the i
no fault code if less than the likits programmed, say 115%
but why 5? You sounded surprised, an understatement, in fact incredulous
And that exceeded the drive rating?
yes
the i was measured after the xfmr (4:1) at 35 A
since you were 'astonished' that it lasted 5 years
miraculous lol
Remind what the drive input current rating is?
not concerned with the input
it is the output that matters in this case
OK.
glad you realized that
he measured the output after the xfmr
OK.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
This thread has gone astray and the OP has indicated that his questions were sufficiently answered, so I am closing it.
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