RE: [CAD_CAM_EDM_DRO] Relay question about diodes across the coil

With the temperature as low as it is, maybe it would act as a supplemental
heater?

Jeff



-----Original Message-----
From: Harvey White [mailto:madyn@...]
Sent: Saturday, January 10, 2004 11:06 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Relay question about diodes across the coil

On Sat, 10 Jan 2004 21:57:03 -0500, you wrote:

>Jeff,
> On ac the diode cuts the voltage to the coil in half.

Only with the diode in series. If the diode is placed on an AC relay
in parallel with the coil, you will connect the diode across the full
supply on every half cycle.

not recommended.

Harvey


>Happy Hunting
>archie =) =) =)
>
>
>At 02:05 AM 1/11/2004 +0000, you wrote:
>>Back when I was a kid learning about relay circuits on the job
>>(1960's), most of the control circuits I got involved in used low
>>voltage A.C. and I don't ever remember seeing a diode. I just found
>>out that it's good practice to put a diode across the coil of relays
>>to keep them from chattering due to the current stored in the coil
>>inductance. Question is: Only on D.C. relays or is this supposed
>>to be done on A.C. relays as well?
>>
>>Jeff
>>
>>
>>
>>
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aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
>http://www.metalworking.com/news_servers.html
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>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
Moderator: pentam@... indigo_red@... davemucha@...
[Moderators]
URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO

OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
bill
List Mom
List Owner



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