Hoping an electronics whizz can help with this.
I plan to use a plc wuth 24v outputs to control various 240v appliances upto 9amps.
Please can someone recommend a suitable relay from maplins (I have some vouchers left...). I've looked on the website but I cannot decide which relays will do the job.
Many thanks
Matthew
PS Thanks to all those you helped with my earlier central heating problem - much appreciated.
Their round base plug in 'octal' relays - JG59 @ 3.99 are an industry standard available near everywhere. You can buy a screw terminal base which makes wiring easy. They're DPDT and rated at (sic) "2400 VA resistive, 280 W resistive" which last one I'd guess they mean inductive. They draw 51mA.
If you're in no rush, check out Electronic Components on Ebay - relays there are much cheaper than retail.
Maplin NG82D should be just about right - as long as the PLC will power the relay coil - but since all it needs is 15mA it should be fine.
Cheers both.
Had a quick look on ebay and found a few relays, but didn't know which ones would do the job!
Thanks
Matt
I presume that this is a transistor output. Don't forget that you may need a reverse connected diode across the relay coil to stop the back EMF from frying the transistors when the coil is deenergised. Some relays have these fitted; some relay bases include them; some bases accept plug in diodes and some you'll just have to connect across the terminals.
Steve W
Good thought Steve, but the outputs are relay, so my life is simpler!
Cheers,
Matthew
snipped-for-privacy@one-web.com (Matthew Humphreys) wrote in news: snipped-for-privacy@news.onetel.net.uk:
I think Steve's thought is still good; it is quite possible to weld reed relays shut with the spark from a relay coil that it's controlling (don't ask me how I know)
And it doesn't do any contact much good to be often breaking inductive DC loads; it's just good practice to fit diodes. And 1N4006s or similar ar about a penny a dozen!
mike r
These might be some use:-
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