Latched relay?

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ricey777

Member - Posts: 11

Joined: November 30, 2006

Location: United Kingdom

Posted: December 02, 2006 at 6:04 AM / IP Logged

hotwaterwizard wrote:

Latched relay? - Page 3 -- posted image.

Thats It !!

Can i not just put a cap across each coil to delay the release?

3 or 4 seconds will be ample.

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: December 02, 2006 at 10:23 AM / IP Logged

I found this in the Special Applications Relay section of this site.

https://www.the12volt.com/doorlocks/doorlocks.asp

Found mostly on Mercedes Benz vehicles, the movement of the door lock actuators is controlled by a central vacuum pump. The switch changes polarity on a single wire that may rest at power or ground depending on the state of the door locks. You can duplicate this with at least a 2 second pulse. If the alarm or keyless entry you are installing does not have a 2 second or longer duration option for the door lock outputs, do not use this diagram (it will not work unless you incorporate a timer into this circuit).

Latched relay? - Page 3 -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: December 02, 2006 at 10:42 AM / IP Logged

Like this?

Latched relay? - Page 3 -- posted image.

A very large capacitor would do the trick.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

ricey777

Member - Posts: 11

Joined: November 30, 2006

Location: United Kingdom

Posted: December 02, 2006 at 10:46 AM / IP Logged

The alrm output is a very short pulse, probably one second. The central locking pump however requires around 3 seconds to lock or unlock the doors. In the original set up the 12v is constant to the lock or unlock wires.

ricey777

Member - Posts: 11

Joined: November 30, 2006

Location: United Kingdom

Posted: December 02, 2006 at 10:48 AM / IP Logged

Yes that looks good.

What value cap though ?

ricey777

Member - Posts: 11

Joined: November 30, 2006

Location: United Kingdom

Posted: December 02, 2006 at 11:03 AM / IP Logged

OK.

If my relay has a resistance of 80 ohms, a cap of 50,000uF will give a delay of 4 seconds ?

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: December 02, 2006 at 11:10 AM / IP Logged

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

ricey777

Member - Posts: 11

Joined: November 30, 2006

Location: United Kingdom

Posted: December 02, 2006 at 11:21 AM / IP Logged

Why the extra components, when i can do it with 2 relays, 2 caps and 2 diodes ???

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: December 02, 2006 at 11:23 AM / IP Logged

50,000 uF Capacitors are Available.

Datasheet in PDF Format

http://www.vishay.com/docs/42066/36ddedx.pdf

Available at Mouser about $14 each

http://www.mouser.com/search/ProductDetail.aspx?R=36DX503G025CC2Avirtualkey61320000virtualkey75-36DX503G025CC2A

physical size each

2.5 inches x 4.125 inches

Almost the size of a Soda can each.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

ricey777

Member - Posts: 11

Joined: November 30, 2006

Location: United Kingdom

Posted: December 02, 2006 at 11:34 AM / IP Logged

can you have a look at these ?

LINK

They are quite small 2" x 1.5".

Are they OK ??

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