On 9/5/2015 10:13 AM, dpb wrote:
On 09/05/2015 7:20 AM, Art Todesco wrote:
We have a community well here serving several houses. The whole thing is
pretty fancy. The pump is a 3 phase unit. There is no 3 phase in the
subdivision. But, the controller 'makes' 3 phase and supplies the pump
with 40 to 70 Hz depending on the demand. As there are now few houses on
that well, it's probably running at the 40Hz frequency. The controller
is a Franklin Electric SubDrive 300. I called Franklin Electric and they
wouldn't provide a schematic as it is a "throw-away" device. Excuse me,
it's a $2500 throw-away device! BTW, they won't fix them either ... only
sell you a replacement. Kind of reminds me of Behringer audio equipment.
Anyway, the unit has already been replaced and I have the old unit. I
would like to fix it for a future breakdown. Has anyone dealt with these
units? Any tips would be greatly appreciated. I know that these type of
circuits, basically akin to a switching power supply, can be tricky to
troubleshoot.
Thanks.

Looked at the PFD on the unit; that is pretty fancy for the purpose,
indeed. I'd wager you'd not really notice the difference if simply
replaced it with a conventional system going forward.

I note there are some diagnostics; do you have any indication of what
the failure code(s) were, if any, when that unit was removed? Be a
start, anyway...

A simple replacement would be nice, however, the pump motor itself is 3
phase and there is only single phase available. So the pump would have
to be replaced. Also, the unit was pulled by a local well drilling
company, so I don't know what the error codes might have been. They only
know to replace and junk the old unit. Other than removing the top, I
haven't looked inside yet.