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

On Sat, 10 Jan 2004 23:46:37 -0500, you wrote:

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

no

Don't do this.

Do this ONLY if you want to run the relay off DC, and that's not a
good idea.

Harvey

>
>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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>>
>>
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>>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
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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........
>bill
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>OFF Topic POSTS: General Machining
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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........
>bill
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