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modification to this latching relay


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enoxos 
Member - Posts: 34
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Joined: June 29, 2012
Location: Louisiana, United States
Posted: June 18, 2013 at 8:46 PM / IP Logged  
Can someone help with the following please:
I would like to modify the following relay found in this page, found
here
Latched On/Off Output Using Two Momentary Positive Pulses - Positive Output to a Latched On/Off Output Using One Momentary Positive Pulse to engage and One Momentary Negative to disengage - Positive Output
Any thoughts?
thanks
Ween 
Platinum - Posts: 1,364
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Joined: August 01, 2004
Location: Illinois, United States
Posted: June 18, 2013 at 9:54 PM / IP Logged  
on the third (right) relay, connect terminal 86 to +12V battery instead of ground. terminal 85 will be your negative unlatch input.
mark
enoxos 
Member - Posts: 34
Member spacespace
Joined: June 29, 2012
Location: Louisiana, United States
Posted: June 19, 2013 at 2:27 PM / IP Logged  
sweet Jesus, this forum is gold.
Thank you Ween.
Do you happen to know where I can get a latching relay like the one described above or they do not make such complicated relay?
thanks
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: June 19, 2013 at 5:57 PM / IP Logged  
how much current are you needing to switch?
enoxos 
Member - Posts: 34
Member spacespace
Joined: June 29, 2012
Location: Louisiana, United States
Posted: June 19, 2013 at 6:03 PM / IP Logged  
it is an alarm pulse, probably no more than 0.1 mA. Just say 0.5 mA to be sure.
thanks
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: June 19, 2013 at 6:37 PM / IP Logged  
something such as this http://www.fujitsu.com/downloads/MICRO/fcai/relays/a.pdf
AL-D12W-K
enoxos 
Member - Posts: 34
Member spacespace
Joined: June 29, 2012
Location: Louisiana, United States
Posted: June 19, 2013 at 6:49 PM / IP Logged  
I know I am asking for much, but anything in normal size relay? The wires for the alarm are about 16 gauge.
I am assuming that the one you linked is a solid state and not electromagnetic, right?
thanks
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: June 19, 2013 at 7:13 PM / IP Logged  
no, it's electromagnetic. twin coils, latching, 1A contacts
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: June 19, 2013 at 11:02 PM / IP Logged  
Magnecraft 785XBXCD-12D Dual coil latching, 88 ohm coils, 16 A DPDT contacts.
enoxos 
Member - Posts: 34
Member spacespace
Joined: June 29, 2012
Location: Louisiana, United States
Posted: June 20, 2013 at 2:13 PM / IP Logged  
thank you Ween, you have been very helpful.
I was looking at the wiring diagram for the Dual coil DC (785XBXCD-12D) right here
and I would like to verify, if possible, the following (suing NEMA notation):
(1) 12 volts fused goes to contact B and ground to contact A (coil 1) to set the latching, correct?
(2) if (1) is correct, then the latched 12 volts should come out of contact 4 and contact 6, correct?
(3) a negative pulse can RESET latching relay, correct?
(4) that negative pulse goes at coil 2 with contact 8 at 12 volts fused and 5 being operated by the switch that will provide the negative pulse by means of grounding contact 8, correct?
thanks for your input.
Renee
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