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Latching relay? for 4way switch

N

noel

Jan 1, 1970
0
Hello,
Could someone explain how a latching relay operates. I understand the a DC
type uses a positive pulse and a negitive pulse. I not sure how that would
work or how the wiring would look. I would also like to know how an AC type
would work. I assume that it works by applying current to the proper coil,
or the proper end of it. Is there just a single coil in both types or what?
Thanks
 
L

Lord Garth

Jan 1, 1970
0
noel said:
Hello,
Could someone explain how a latching relay operates. I understand the a DC
type uses a positive pulse and a negitive pulse. I not sure how that would
work or how the wiring would look. I would also like to know how an AC type
would work. I assume that it works by applying current to the proper coil,
or the proper end of it. Is there just a single coil in both types or what?
Thanks

Sounds like you're describing a bistable relay. This type has 2 coils and
when
pulsed, the relay latches the appropriate contacts with no holding current.

Are you asking for an X10 or computer controlled 4PDT relay? There are
X10 SPDT relays made...use 4, all set to the same address.
 
A

Anders

Jan 1, 1970
0
There is 3 different ways to solve this.
1. one coil that is polarized and that mechanicly flipps to each position
2. two coils that mechanicly flipps to each position
3. one coil that mecanicly is locked in each position like a pushbutton that
stays in each position.
 
W

Watson A.Name - Watt Sun, Dark Remover

Jan 1, 1970
0
Hello,
Could someone explain how a latching relay operates. I understand the a DC
type uses a positive pulse and a negitive pulse. I not sure how that would
work or how the wiring would look. I would also like to know how an AC type
would work. I assume that it works by applying current to the proper coil,
or the proper end of it. Is there just a single coil in both types or what?
Thanks

There are several kinds. One kind has a magnet on the coil, so when
the coil pulls in the armature, it stays pulled in. You have to
reverse the polarity of the coil current to 'unpull' it. Another
similar relay uses two coils, one to pull in and one to pull out.

Another latching relay uses a mechanism similar to a ball point pen.
Every time the coil pulls the solenoid in, it clicks a latch or
rotates a cam. The second pull disconnects the contacts.

I've seen a latching relay that's a sliding bar with a coil at each
end. The bar shuttles back and forth, and the lobe or bump on the bar
makes or breaks the contacts as it moves.

And then there's a regular relay that's driven by a flip-flop that
toggles on and off. And for DC, the SCR could make a solid state
relay, but it would have to be commutated to turn it off.


--
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W

Watson A.Name - Watt Sun, Dark Remover

Jan 1, 1970
0
Sounds like you're describing a bistable relay. This type has 2 coils and
when
pulsed, the relay latches the appropriate contacts with no holding current.

Are you asking for an X10 or computer controlled 4PDT relay? There are
X10 SPDT relays made...use 4, all set to the same address.

Did everyone hear that X10 went bankrupt? The SOBs that annoyed us
with pop-up and pop-under camera ads won't be bothering us anymore.
Good riddance to bad rubbish!


--
@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@,@@[email protected]@[email protected],@@[email protected]@[email protected]@[email protected]@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
 
W

Watson A.Name - Watt Sun, Dark Remover

Jan 1, 1970
0
There is 3 different ways to solve this.
1. one coil that is polarized and that mechanicly flipps to each position
2. two coils that mechanicly flipps to each position
3. one coil that mecanicly is locked in each position like a pushbutton that
stays in each position.

And #4 - regular relay driven by a flip-flop.



--
@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@,@@[email protected]@[email protected],@@[email protected]@[email protected]@[email protected]@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
 
L

Lord Garth

Jan 1, 1970
0
Watson A.Name - Watt Sun said:
Did everyone hear that X10 went bankrupt? The SOBs that annoyed us
with pop-up and pop-under camera ads won't be bothering us anymore.
Good riddance to bad rubbish!

Interesting and goodbye! I don't think the X10 website was owned by the
same company that invented the X10 carrier current system....I could be
wrong though! I seem to remember the product originally had the BSR
name.
 
K

Keith R. Williams

Jan 1, 1970
0
Interesting and goodbye! I don't think the X10 website was owned by the
same company that invented the X10 carrier current system....I could be
wrong though! I seem to remember the product originally had the BSR
name.

Yes, but they spun off the X10 line into a separate company. FYI,
Leviton makes X10 compatible devices and many more that X10 doesn't
make. Some are very interesting and all are expen$ive.
 
K

Keith R. Williams

Jan 1, 1970
0
Watson said:
And #4 - regular relay driven by a flip-flop.

#5 - A permanent magnet keeper. When the fields add it latches in.
When they oppose it latches out. (The permag doesn't have enough
strength to move the relay by itself, but enough to keep it.)

#6 - One solenoid on a ratchet/cam. One pulse closes the contact, the
next toggles it open. If on/off operation is desired, in each state
sample to make sure it's in the desired state and energize again if not
(e.g. X10 appliance modules).
 
F

Fred Abse

Jan 1, 1970
0
And #4 - regular relay driven by a flip-flop.

And #5 - simplest of all, one contact of the relay used to hold the coil
energized. used more than any other method, IME.
 
R

Ross Mac

Jan 1, 1970
0
noel said:
Hello,
Could someone explain how a latching relay operates. I understand the a DC
type uses a positive pulse and a negitive pulse. I not sure how that would
work or how the wiring would look. I would also like to know how an AC type
would work. I assume that it works by applying current to the proper coil,
or the proper end of it. Is there just a single coil in both types or what?
Thanks
There is a way to make a normal relay latching by using one set of the
contacts to create the latch. A momentary switch would pull the contactor in
and the contacts would hold it in and another momentary switch would drop it
out by opening the coil voltage. The momentaries can easily be replaced by
other devices.........
 
D

Dr. Anton Squeegee

Jan 1, 1970
0
Hello,
Could someone explain how a latching relay operates. I understand the a DC
type uses a positive pulse and a negitive pulse. I not sure how that would
work or how the wiring would look. I would also like to know how an AC type
would work. I assume that it works by applying current to the proper coil,
or the proper end of it. Is there just a single coil in both types or what?
Thanks

My understanding, as described to me by one of my former
acquaintances who was an aircraft electrical systems guy at Boeing...

What you refer to is also, sometimes, called a 'balanced force'
relay, and they are frequently used in aircraft and military
applications. They have two coils, and two small permanent magnets.

When at rest, the relay's armature is held in said resting
position by one of the permanent magnets. When current is applied to one
of the coils, the pull is enough to overcome the opposite permanent
magnet, and to bring the relay's armature to the opposite state.

The permanent magnets help to insure that exactly the same force
is applied to the relay armature no matter which coil is energized. They
also serve to reduce or eliminate contact bounce, thus allowing the
relay to operate reliably under high-vibration conditions.

What you describe (a single coil using differing polarities for
each direction) could probably be done (heck, already has been done I
think) as well.


--
Dr. Anton Squeegee, Director, Dutch Surrealist Plumbing Institute
(Known to some as Bruce Lane, KC7GR)
kyrrin a/t bluefeathertech d-o=t c&o&m
Motorola Radio Programming & Service Available -
http://www.bluefeathertech.com/rf.html
"Quando Omni Flunkus Moritati" (Red Green)
 
N

norm d.

Jan 1, 1970
0
Latching relays have 2 coils. You apply power to one and the contacts change
like a latching switch. You don't have to maintain power to the coil for the
contacts to maintain the new position. Apply momentary power to the 2nd coil
to flip the contacts back to the initial condition.
 
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