modification to this latching relay
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=134401
Printed Date: April 29, 2024 at 1:25 AM
Topic: modification to this latching relay
Posted By: enoxos
Subject: modification to this latching relay
Date Posted: June 18, 2013 at 8:46 PM
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
Replies:
Posted By: Ween
Date Posted: June 18, 2013 at 9:54 PM
on the third (right) relay, connect terminal 86 to +12V battery instead of ground. terminal 85 will be your negative unlatch input.
mark
Posted By: enoxos
Date Posted: June 19, 2013 at 2:27 PM
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
Posted By: Ween
Date Posted: June 19, 2013 at 5:57 PM
how much current are you needing to switch?
Posted By: enoxos
Date Posted: June 19, 2013 at 6:03 PM
it is an alarm pulse, probably no more than 0.1 mA. Just say 0.5 mA to be sure.
thanks
Posted By: Ween
Date Posted: June 19, 2013 at 6:37 PM
something such as this https://www.fujitsu.com/downloads/MICRO/fcai/relays/a.pdf
AL-D12W-K
Posted By: enoxos
Date Posted: June 19, 2013 at 6:49 PM
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
Posted By: Ween
Date Posted: June 19, 2013 at 7:13 PM
no, it's electromagnetic. twin coils, latching, 1A contacts
Posted By: Ween
Date Posted: June 19, 2013 at 11:02 PM
Magnecraft 785XBXCD-12D Dual coil latching, 88 ohm coils, 16 A DPDT contacts.
Posted By: enoxos
Date Posted: June 20, 2013 at 2:13 PM
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
Posted By: enoxos
Date Posted: June 20, 2013 at 2:14 PM
the link does not work above please use this
Posted By: Ween
Date Posted: June 20, 2013 at 10:00 PM
1. correct
2. 7 and 9 are the common terminals for their respective poles,
likewise 4 and 6 are the normally open terminals, 1 and 3 normally closed. battery power on 7 will transfer from 1 to 4 when the relay operates/latches and revert back to 1 when reset/unlatched.
3. correct
4. correct
Posted By: enoxos
Date Posted: June 21, 2013 at 4:09 PM
thank you Ween, I ordered the part and install it early next week.
thanks again.
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