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Re: (ET) field rev.
20 years ago on my E15 I pulled the finger relays out and replaced them
with a 24VDC Potter & Rumfeld plug-in socket enclosed relay (with a
resistor on the coil side to drop 12 VDC) and have not touched them since.
Finger relays are junk for sure. The P&R relay is very robust.
...Walt
-----Original Message-----
From: Christopher Zach [mailto:czach computer org]
Sent: Friday, July 14, 2006 9:49 AM
To: Konstanty, Walter (GE Indust, ConsInd)
Cc: Ferguson Apiaries; elec-trak cosmos phy tufts edu
Subject: Re: (ET) field rev.
Konstanty, Walter (GE Indust, ConsInd) wrote:
> Some Design theory inputs for a Friday morning:
>
> - It's less costly to reverse the field polarity to make the motor
> reverse. Smaller contactor required.
Mmm... Like everything else, relative. While true the field current is
lower, when you switch it you still will get arcing across the switch
point. If it's a little relay, it's going to weld shut at some point
(cf: all the E15's in the world)
They still should have used contactors on the E15.
Chris