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Discussion Starter · #1 ·
Hi all,
I'm having a hard time finding a particular relay. I'm looking for something that powers the coil with 120 or 240VAC, and allows me to turn on a 12VDC power source.

The purpose: I want to tap into the power lines for my charger, and have it turn this relay on when the charger is plugged in. It will then turn on the 12VDC for the BMS.

Any recommendations on a relay? Or any general site that has a good list of them?

-corbin


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Discussion Starter · #2 ·
Thanks Peter!

That's one of the troubles I'm having...exactly which one!

I'll have to poke through them and figure it out. I also found:

http://www.magnecraft.com/

--corbin

Peter C. Thompson wrote:

> Hi Corbin,
>
> Check out www.mouser.com. There are hundreds of relays with 120/240v
> input. It will be difficult to choose. :)
>
> Cheers,
> Peter
>
> On 1/18/2011 9:09 AM, corbin dunn wrote:
>> Hi all,
>> I'm having a hard time finding a particular relay. I'm looking for something that powers the coil with 120 or 240VAC, and allows me to turn on a 12VDC power source.
>>
>> The purpose: I want to tap into the power lines for my charger, and have it turn this relay on when the charger is plugged in. It will then turn on the 12VDC for the BMS.
>>
>> Any recommendations on a relay? Or any general site that has a good list of them?
>>
>> -corbin
>>
>>
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>
>
> --
> ------------------------------------------------------------------------
> *Peter C. Thompson*
> *Qualcomm, Incorporated.* Office: +1 (858) 658-1936 Mobile: +1
> (858) 692-3571
> AIM: PThompson509 Yahoo!:peter_thompson MSN:
> [email protected] Skype: PThompson509
>
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Discussion Starter · #3 ·
Ah, I think I found one! That site was easy to search on.

http://www.mouser.com:80/ProductDetail/Omron/G2RV-1-S-DC48/?qs=gOdenYySUw7FUfzm4Gz2IA%3d%3d#AB
Document: http://www.components.omron.com/components/web/PDFLIB.nsf/0/B20D2E57E8CEFF6385257201007DD6C8/$file/G2RV_0609.pdf

It takes: 48 VAC/VDC, 110 VAC, 230 VAC, and is less than $10

corbin


Peter C. Thompson wrote:

> Hi Corbin,
>
> Check out www.mouser.com. There are hundreds of relays with 120/240v
> input. It will be difficult to choose. :)
>
> Cheers,
> Peter
>
> On 1/18/2011 9:09 AM, corbin dunn wrote:
>> Hi all,
>> I'm having a hard time finding a particular relay. I'm looking for something that powers the coil with 120 or 240VAC, and allows me to turn on a 12VDC power source.
>>
>> The purpose: I want to tap into the power lines for my charger, and have it turn this relay on when the charger is plugged in. It will then turn on the 12VDC for the BMS.
>>
>> Any recommendations on a relay? Or any general site that has a good list of them?
>>
>> -corbin
>>
>>
>> -------------- next part --------------
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>> | REPLYING: address your message to [email protected] only.
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>>
>
>
> --
> ------------------------------------------------------------------------
> *Peter C. Thompson*
> *Qualcomm, Incorporated.* Office: +1 (858) 658-1936 Mobile: +1
> (858) 692-3571
> AIM: PThompson509 Yahoo!:peter_thompson MSN:
> [email protected] Skype: PThompson509
>
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Discussion Starter · #4 ·
Hello Corbin,

You can use any 120 or 240 VAC relay with AC contacts that are rated for at
least 3 times the load and the voltage is rated for at least 10 times the DC
voltage you want to switch.

For example, I have a Square D glass plug in relay that has a coil rating of
240 VAC that is power by 180 VDC with contacts rated at 10 amps at 240 vac
which is switching 180 VDC at 1 amp. This relay now has been going since
1976 with no problems.

The relay is a three pole, so I have two spare contacts available. Also I
am using a Zener Overvoltage Transient Bidirectional Suppressor across the
contacts and all other relays and contactors. you can get these devices
from a local electronics store. Use a Zener that is about three times the
rating or a 36 volt one for 12 volts.

You can get these relays or similar type from a local electrical supply
house. Go to a local electrical shop and get a purchase order to pick one
up. Some heating and air-condition supply shops handle Honey Well relays at
that rating will work too.

Roland






----- Original Message -----
From: "corbin dunn" <[email protected]>
To: "EVDL Discussion List" <[email protected]>
Sent: Tuesday, January 18, 2011 9:09 AM
Subject: [EVDL] Any recommendations for 120/240VAC relay to switch 12VDC?


> Hi all,
> I'm having a hard time finding a particular relay. I'm looking for
> something that powers the coil with 120 or 240VAC, and allows me to turn
> on a 12VDC power source.
>
> The purpose: I want to tap into the power lines for my charger, and have
> it turn this relay on when the charger is plugged in. It will then turn on
> the 12VDC for the BMS.
>
> Any recommendations on a relay? Or any general site that has a good list
> of them?
>
> -corbin
>
>
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Discussion Starter · #5 ·
Radio Shack has these - usually in stock. That's where I bought mine for
the same purpose.


On Tue, Jan 18, 2011 at 11:09 AM, corbin dunn
<[email protected]>wrote:

> Hi all,
> I'm having a hard time finding a particular relay. I'm looking for
> something that powers the coil with 120 or 240VAC, and allows me to turn on
> a 12VDC power source.
>
> The purpose: I want to tap into the power lines for my charger, and have it
> turn this relay on when the charger is plugged in. It will then turn on the
> 12VDC for the BMS.
>
> Any recommendations on a relay? Or any general site that has a good list of
> them?
>
> -corbin
>
>
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--
Geoff Pullinger
[email protected]
http://www.evalbum.com/2445
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Discussion Starter · #6 ·
I don't have any specific recommendation for a relay, but I wanted to put in
a plug for Mouser. I have ordered several parts from them and been very
pleased with their shipping and responsiveness. I don't think they are
particularly cheap, but I don't think they are terribly expensive compared
to similar quality either. They will also ship any size order in the US
with reasonable postage and handling.

After your first order, you will probably receive the entire 1000+ page
Mouser catalog in the mail. Quite a thing to leaf through!

Mike

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of corbin dunn
Sent: Tuesday, January 18, 2011 10:37 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Any recommendations for 120/240VAC relay to switch
12VDC?

Ah, I think I found one! That site was easy to search on.

http://www.mouser.com:80/ProductDetail/Omron/G2RV-1-S-DC48/?qs=gOdenYySUw7FU
fzm4Gz2IA%3d%3d#AB
Document:
http://www.components.omron.com/components/web/PDFLIB.nsf/0/B20D2E57E8CEFF63
85257201007DD6C8/$file/G2RV_0609.pdf

It takes: 48 VAC/VDC, 110 VAC, 230 VAC, and is less than $10

corbin


Peter C. Thompson wrote:

> Hi Corbin,
>
> Check out www.mouser.com. There are hundreds of relays with 120/240v
> input. It will be difficult to choose. :)
>
> Cheers,
> Peter
>
> On 1/18/2011 9:09 AM, corbin dunn wrote:
>> Hi all,
>> I'm having a hard time finding a particular relay. I'm looking for
something that powers the coil with 120 or 240VAC, and allows me to turn on
a 12VDC power source.
>>
>> The purpose: I want to tap into the power lines for my charger, and have
it turn this relay on when the charger is plugged in. It will then turn on
the 12VDC for the BMS.
>>
>> Any recommendations on a relay? Or any general site that has a good list
of them?
>>
>> -corbin
>>
>>
>> -------------- next part -------------- An HTML attachment was
>> scrubbed...
>> URL:
>> http://lists.sjsu.edu/mailman/private/ev/attachments/20110118/442e8a3
>> 2/attachment.html _______________________________________________
>> | REPLYING: address your message to [email protected] only.
>> | Multiple-address or CCed messages may be rejected.
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>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>>
>
>
> --
> ----------------------------------------------------------------------
> --
> *Peter C. Thompson*
> *Qualcomm, Incorporated.* Office: +1 (858) 658-1936 Mobile: +1
> (858) 692-3571
> AIM: PThompson509 Yahoo!:peter_thompson MSN:
> [email protected] Skype: PThompson509
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
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Discussion Starter · #7 ·
Thanks Lee! This is some great information to know. I haven't decided the exact route I'm going to go for how to solve it. Yes, the charger is 120VAC or 220VAC, which complicates the problem, otherwise I could just use a 120VAC relay. The 12 volt load is low current; the BMS needs 150mA at 12VDC.

I actually already have a little universal power supply that converts 120-240VAC to 12VDC:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=497-8379-5-ND

The Elithion BMS manual recommends running it to a relay to make sure the power drops to 0. I may just wire it up to a regular low-power relay to get it to work.

Chris -- great point about the laptop power supply! I probably have a spare one laying around.

Gary -- thanks for the link to the relay on KTA; I actually have that one (but it is 120VAC only).

Thanks again,
corbin

Lee Hart wrote:

> On 1/18/2011 11:37 AM, corbin dunn wrote:
>> Ah, I think I found one! That site was easy to search on.
>> http://www.mouser.com:80/ProductDetail/Omron/G2RV-1-S-DC48/?qs=gOdenYySUw7FUfzm4Gz2IA%3d%3d#AB
>>
>>
> Document:
> http://www.components.omron.com/components/web/PDFLIB.nsf/0/B20D2E57E8CEFF6385257201007DD6C8/$file/G2RV_0609.pdf
>>
>> It takes: 48 VAC/VDC, 110 VAC, 230 VAC, and is less than $10
>
> This seems to be an incomplete part number; it represents a family of
> relays rather than one specific relay.
>
> The "DC48" implies it has a 48vdc coil. The same family has relays with
> all sorts of different coil voltages and currents.
>
> As a rule, a relay coil won't work on both AC and DC (or if it does, it
> has different ratings). Also, you generally don't find one relay that
> works on both 120vac and 240vac. But, it's possible. Sometimes a coil
> has a built-in bridge rectifier, so it works the same on AC or DC. Large
> power contactors are also available with two 120vac coils that you can
> wire in parallel for 120vac, or in series for 240vac.
>
>>>> The purpose: I want to tap into the power lines for my charger,
>>>> and have it turn this relay on when the charger is plugged in. It
>>>> will then turn on the 12VDC for the BMS.
>
> If the charger can be powered from either 120vac or 240vac, then you can
> get a dual-coil relay as mentioned above.
>
> If the 12v load being switched is low current, then all you need is a
> little relay; these normally don't come with dual voltage coils. In this
> case, I'd add something in series with the coil to drop the excess 120v
> when the relay is operated on 240vac, so the coil still sees about.
>
> The simplest solution is a light bulb. Get a relay with a 120vac coil.
> Measure or look up the current it draws on 120vac. Let's say it's 25ma.
> 120v x 25ma = 3 watts. OK; then put a 120v 3w light bulb in series (a
> little night-light or Christmas tree bulb).
>
> On 120v:
> -------
> The light bulb is initially cold, and has less than 1/10th of its hot
> resistance. 90% of the voltage appears across the relay coil. Relays are
> guaranteed to pull in at anything over 75-80% of rated voltage; so it
> pulls in.
>
> When the bulb warms up, its resistance increases dramatically. It will
> settle with about half the voltage across the bulb, and the other half
> across the relay coil. Relays are guaranteed to stay pulled in down to
> 20-30% of rated voltage; so the relay stays pulled in.
>
> On 240v:
> -------
> Initially, the cold bulb allows twice the normal current to flow in the
> coil. This is no problem; it just makes it pull it a little faster. But
> within less than a second, the bulb will heat up and light. Now you have
> about 120v across the bulb, and the other 120v across the relay coil.
> Everything operates normally.
>
> If you can't find a light bulb that exactly matches the relay coil's
> current, you can use a pair of smaller bulbs, or add a resistor in
> parallel with the relay coil. Your goal is to have half the voltage
> across the relay coil and light bulb(s) on 240v.
>
> There are more complicated ways to do it, too. Solid state voltage
> regulators, or a solid-state relay, etc. Heck, you can even add a
> microcomputer to do it! :)
>
> --
> Lee A. Hart | Ring the bells that still can ring
> 814 8th Ave N | Forget the perfect offering
> Sartell MN 56377 | There is a crack in everything
> leeahart earthlink.net | That's how the light gets in -- Leonard Cohen
>
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