[GreenKeys] The motor start capacitor strikes back
Ethan Blanton
elb at kb8ojh.net
Sat Feb 24 16:31:07 EST 2018
Hello again,
My NEMA ML-3R plugs are in hand, and I've wired up both the LPR and
LPW. Thanks again!
However, I'm back to motor start capacitors. After a previous
exchange, I ordered some 88-108 mF motor start capacitors from a
surplus site. I just cracked open the motor unit on the LXD, though,
and -- wah wah waaaaaah -- while the new cap is the right physical
size to fit under the motor, the cap in place right now is 43-48 mF,
not 88-108! I don't know exactly what the situation is for these
synchronous motors, but I know that in other circumstances that could
cause the starting relay to fail to kick out in a timely fashion,
damaging either the motor or the starting capacitor (or both).
So ... anyone have a source on starting capacitors of the correct
value? I'm slowly putting together an order to quote from our friend
Paul at RTTY Electronics (containing a whole smattering of parts), so
perhaps I'll try that route, but I suspect surplus Teletype corp
starter caps aren't substantially newer than the failed caps that are
already in place. ;-) I've been looking again, and motor start
capacitors small enough to fit under that sub-chassis still do not
seem to be a thing I can find.
Ethan
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