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how to wire up relay
DaOld Man:
http://skennys-arcade.blogspot.com/2007/05/switching-power.html
G1zm0:
thanx but ive read that post as posted earlyer but still no help,
i dont know what contacts are open, i dont know what each terminal does, as ive put on diagram its just arrows pointing all roads, one is 250 another is 28v i dont knw whats what
if i put 240 into 28v i get BANG and i dont want to go down that road
DaOld Man:
I think Bob has already told you how to wire it, but I know this can be a little scary.
Looks like from the info you have given us that the relay is rated for 250 volts AC or 28 volts DC. This is for the contacts. Contacts are rated for different currents at AC and DC because DC makes a bigger arc (spark) when the contacts open.
Since you are using 250 volts, here is how I would wire it (Provided that symbols on your relay match what Bob posted):
Live wire from supply to pin 1
Live wire to your power strip to pin 3
Neutral wire from the supply to pin 8.
Neutral wire to the power strip on pin 6.
If the neutral wire really is neutral on your system, then you don not have to switch it with the relay, but it wont hurt a thing to switch it.
The ground (or earth) wires will not connect to the relay at all, tie the one from the supply directly to the one to the power strip.
Use wire nuts or solder the ground wires together. Use heat shrink tubing or good tape to insulate the junction.
The 12 volts from the computer will tie to pins 2 and 7. If you are using a diode then it will also tie to pins 2 and 7. Make sure the band on the diode ties to the same terminal as the yellow wire from the computer.
If the relay has a + and - signs on pins 2 and 7, then yellow ties to + and black ties to -.
If these two pins are not marked + and - then it shouldnt matter. But it does matter on the diode. Band on diode goes to +. Hooking the diode backwards will cause a short circuit.
G1zm0:
thanx guys, ill give it a pop tmoz after i get diode and will try it with light 1st , someone says it should be wired like a buzbar? to spread the load due to all the items beeing on.
the diagram showen with the info is what is on the relays body
*with the mains live going to 1 & 3, i take it the relay will always be live?
and i take it the pins not mentioned 4&5 are for the 28v connection? that doesnt get used
wil any type of protection diode do? ive a old kortex chassis with diodes on it but i dont know if they are the correct ones or tunnel diodes, (black cylentrical body with the white ring)
BobA:
Pins 4 and 5 are the NC contacts. They are not used. You are getting the DC voltage switching capability of the relay and the AC voltage switching confused. The 28 V is simply the DC rating and goes thru the same contacts as the AC voltage. Your relay can switch either DC or AC. You are switching AC so you can ignore the DC except for the DC that is used on the coil.
When the relay is not powered the mains live goes to pin 1 and pin 4 is live (NC). When DC 12V is applied to 2 & 7 the relay is powered and the mains live on pin 1 is switched to pin 3 (NO). That is all you have to wire. You can also switch you mains neutral thru pins 8 and 6 but you do not have to. Your relay base is always hot so treat it with care.
You can use about any power diode to protect from spikes. Common designations in the US and Canada are 1N4004 and 1N4002. The higher the last number the higher the rev voltage it can handle.
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