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Electronics Forum / Basics / April 2007Using a relay
I got a relay I cant figure out how to use, it as 5 connectors. Its a finder 36.11.9.005.0000 5V(dc) 10A 250V(ac), I dont have a datasheet for it. The legs are like this O_O 1_2 OOO 345 1=NO (Normally open?) 2=NC (Normally closed?) 3=no label 4=COM 5=no label Anyone know how to use this, if its even something I can use :) /Jan > I got a relay I cant figure out how to use, it as 5 connectors. > [quoted text clipped - 14 lines] > > /Jan It looks like the 5 volt DC coil is connected between pins 3 and 5. When unpowered, there should be a (normally) closed contact between pins 4 and 2. When 5 volts is connected to the coil, there should be a contact closure between pins 4 and 1. Check the resistance between pins 3 and 5, to see if it is a reasonable resistance for a 5 volt coil. I would expect a resistance between 25 and 100 ohms. >I got a relay I cant figure out how to use, it as 5 connectors. > [quoted text clipped - 12 lines] > >Anyone know how to use this, if its even something I can use :) What you have is a single pole double throw (SPDT) relay. The coil is rated for 5 VDC, and the contacts are rated for up to 10A at 250VAC. NO and NC are, as you surmised, normally open and normally closed. Pins 3 and 5 would be the relay coil. Pin 4 (COM) is the common terminal, connected (internally) to pin 2 (NC) when the relay coil is not powered, and to pin 1 (NO) when the coil is powered. Specifically: - no current across pins 3 & 5: pin 4 is connected to pin 2, and not to pin 1 - 5VDC across pins 3 & 5: pin 4 is connected to pin 1, and not to pin 2 Whether this is something you can use, depends on what your application for it might be.  SignatureRegards, Doug Miller (alphageek at milmac dot com) It's time to throw all their damned tea in the harbor again. Doug Miller skrev: > Specifically: > - no current across pins 3 & 5: pin 4 is connected to pin 2, and not to pin 1 > - 5VDC across pins 3 & 5: pin 4 is connected to pin 1, and not to pin 2 It works, thanks :) seems wierd to have the com so close to the 5vdc, since it can be dangerous voltage ? /Jan > Doug Miller skrev: >> Specifically: [quoted text clipped - 6 lines] > seems wierd to have the com so close to the 5vdc, since it can be > dangerous voltage ? I agree. I would not use this relay to switch line voltage, unless the 5 volt supply was completely and safely isolated from any chance of being touched, and was referenced to the voltage applied to the common. John Popelish skrev: > I agree. I would not use this relay to switch line voltage, unless the > 5 volt supply was completely and safely isolated from any chance of > being touched, and was referenced to the voltage applied to the common. Some time in the future I plan to switch line, but probaly with another relay, its a jungle :) I just need a Normally Open relay rated for a few amp 230V, and triggered by 5vdc so I can do it from a logic circuit. This one is rated for 24VDC too, so I will find some uses for it :) Is that a Single Pole Single Throw - Normally Open then ? /Jan >John Popelish skrev: >> I agree. I would not use this relay to switch line voltage, unless the [quoted text clipped - 10 lines] > >Is that a Single Pole Single Throw - Normally Open then ? That's correct. Of course, a double-throw relay can be used in place of either a single-throw NO or a single-throw NC -- you just leave the other terminal open. SignatureRegards, Doug Miller (alphageek at milmac dot com) It's time to throw all their damned tea in the harbor again. > John Popelish skrev: >> I agree. I would not use this relay to switch line voltage, unless [quoted text clipped - 13 lines] > > /Jan You cannot generally switch a relay from a logic circuit, logic circuit will not provide enough mA, you will need a transistor between the output and the relay Pete D skrev: > You cannot generally switch a relay from a logic circuit, logic circuit > will not provide enough mA, you will need a transistor between the > output and the relay Ok, the pics I use can handle 20mA current draw on the out pins. Still waiting for a new fuse to be able to measure amp, oops :) /Jan > Pete D skrev: >> You cannot generally switch a relay from a logic circuit, logic [quoted text clipped - 5 lines] > > /Jan You have a point, I was thinking logic gates not MPU, just thought it worth mentioning, as the original poster didn't know how to wire a relay, i suspect not using a MPU. Of course I could be wrong, I usually am ;-) Pete D skrev: > You have a point, I was thinking logic gates not MPU, just thought it > worth mentioning, as the original poster didn't know how to wire a > relay, i suspect not using a MPU. > Of course I could be wrong, I usually am ;-) I am the OP :) I started playing with electronics a few months ago, so even after a lot of reading, its still pretty basic. I am using the picaxe, not a "real" pic but a lot faster to code on (mostly because I dont know c, cpp or assembly). but yes its worth mentioning, I already killed one of their medium range chips, not sure how, but resistors and making sure not to draw much more than a relay, transistor or led from the pins could be a start :) /Jan > Pete D skrev: >> You have a point, I was thinking logic gates not MPU, just thought it [quoted text clipped - 5 lines] > I started playing with electronics a few months ago, so even after a lot > of reading, its still pretty basic. Oh mine is pretty basic, after a mere 30 years, sokeep plugging away at it > I am using the picaxe, not a "real" pic but a lot faster to code on > (mostly because I dont know c, cpp or assembly). If you want to program 'real' PIC's but want to stick to Basic, have a look at www.crownhill.co.uk their Proton basic is very powerfull, there is a free sample version with a limited no of lines of code. > but yes its worth mentioning, I already killed one of their medium range > chips, not sure how, but resistors and making sure not to draw much more > than a relay, transistor or led from the pins could be a start :) > > /Jan >I got a relay I cant figure out how to use, it as 5 connectors. > [quoted text clipped - 14 lines] > >/Jan The Finder website isn't working so trying to get data is hopeless. Nevertheless, The Relays-R-Us website in the UK does have some info on the 36 series http://www.relays-r-us.co.uk/webpages/products/finder_cat/36.htm |
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