Re: (ET) 36vdc relays

[Tim Humphrey <hump evgrin com>]

They also would include a diode to make it an ac/dc coil. Without the diode
it wouldn't energize with an ac input.   
--
Stay Charged!
Hump

GE I-5
Blossvale, NY


 
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of steves
> Sent: Monday, August 07, 2006 10:28 AM
> To: et
> Subject: Re: (ET) 36vdc relays
> 
> The coil is also an inductor, which means it stores energy. When you
> disconect the coil the energy will be released. It's a spike of opposite
> polarity from the drive signal which can play havoc with the coil drive
> circuit (esp. if it's electronic). The diode routes this back EMF
> (electromotive force) back through the coil to dissipate the energy in a
> safe way. This is very common practice, though usually the diode is in 
> the
> external circuit.
> 
> - SteveS
> 
> 
> Michael S Briggs wrote:
> 
> > 
> >>I retested the relay and it worked so the blown diode did not 
> ruin
the 
> >>relay.
> > 
> > 
> > Hm, interesting. Still, why put it in there in the first place?
> > 
> 
> 
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