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Latching relay


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handsy 
Member - Posts: 14
Member spacespace
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Posted: March 01, 2015 at 7:34 AM / IP Logged Link to Post Post Reply Quote handsy
Ok I just got a relay out. I have wired it up as the first post. There is not live from 56b only perm live all the time on 56a? It was latching on and off when on a bench
oldspark 
Gold - Posts: 4,913
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Joined: November 03, 2008
Location: Australia
Posted: March 01, 2015 at 7:40 AM / IP Logged Link to Post Post Reply Quote oldspark
I was once confused by that relays info. Some said it was 56a live permanently with 56b as a (latching) on-off whereas other said it was a typical (headlight) latcher - ie, 56a else 56b.
Of course I can't see the point of the former.
IMO if it's permanent 56a then the coil is not activating else the relay has failed.
handsy 
Member - Posts: 14
Member spacespace
Joined: March 01, 2015
Location: United Kingdom
Posted: March 01, 2015 at 8:29 AM / IP Logged Link to Post Post Reply Quote handsy
Switching is achieved by using a single electrical pulse across the coil terminals 30 (12V +) and S (to switch or ground -) to energise the internal coil and is triggered by the use of a momentary on-off switch, which reduces the time duration the switch is kept closed, the pulse pulls the coil in to switch the circuit from 56 (+feed) and 56a (+feed) to 56 (+feed) and 56b (+feed or not connected for off), once the momentary on switch is pressed again the coil is energised again and the circuit switches back to 56 and 56a.
oldspark 
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Posted: March 01, 2015 at 8:47 AM / IP Logged Link to Post Post Reply Quote oldspark
Nicely pasted from thetoolboxshop.com.
I wonder if anyone can translate or simplify what that means? (Especially wrt to BOTH diagrams - ie, their schematic versus the relay housing's schematic.)
howie ll 
Pot Metal - Posts: 16,466
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Posted: March 01, 2015 at 8:57 AM / IP Logged Link to Post Post Reply Quote howie ll
It ain't a turn on/turn off device it's a latched changeover device, identical to Mr. Ween's famous Hella headlight relay, in normal use, an electrical dip switch.
Not exactly what I believe our OP intends to use it for, still running with an Omron latcher and a mini cube, much simpler and fail safe.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: March 01, 2015 at 9:29 AM / IP Logged Link to Post Post Reply Quote oldspark
I interpret it as a dip switch aka changeover or normal SPDT but mechanically latching despite the contradictory to most relay pic & circuit diagram shown on thetoolboxshop which is like the DNI 0127 (111-941-583) shown on thesamba.com (maybe causing the "permanent" thruput confusion?) - VIZ:
Latching relay - Page 2 -- posted image.
Yet another example of a site I wouldn't use, not that I find Durite's info much good either - eg, why not include in their 0-740-95 datasheet that's it's a 7 minute delay instead of emphasising or confustigating with their "individually programmed ‘PIC’ controlled timer"; or do they tailor each relay or enable user programming? IMO a lack of specification & clarity - as if not including coil resistance or current isn't bad enough.
I seem to be copping a lot of those dubious sites lately... Maybe I need to reOxygenate myself?
handsy 
Member - Posts: 14
Member spacespace
Joined: March 01, 2015
Location: United Kingdom
Posted: March 01, 2015 at 9:45 AM / IP Logged Link to Post Post Reply Quote handsy
http://r./sehMjF
So this?
handsy 
Member - Posts: 14
Member spacespace
Joined: March 01, 2015
Location: United Kingdom
Posted: March 01, 2015 at 9:46 AM / IP Logged Link to Post Post Reply Quote handsy
http://r./sehMjF
handsy 
Member - Posts: 14
Member spacespace
Joined: March 01, 2015
Location: United Kingdom
Posted: March 01, 2015 at 9:49 AM / IP Logged Link to Post Post Reply Quote handsy
Link not working. Can someone tell me where in uk I can get the bistable latching relay which the instruction to my wheel says? Is that the omron you are suggesting? What a mini cube?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: March 01, 2015 at 9:56 AM / IP Logged Link to Post Post Reply Quote howie ll
I told you where to look.
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