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programmable relay for redundancy purpose

PostPosted: Fri Oct 27, 2017 10:21 am
by tngo
Anyone know of a type of relay that will power on once power is applied to it and then stay on for a programmable time say 1 minute or less and then turn off. Once the power goes off to this redundant relay the timer resets and awaits for power to be applied to the redundant relay. I would like to have a redundant timer for ATO and dosing purposes in case there are any lockups to the main RA timer. I haven't found anything readily available like this online. Roberto is this something that can be made if none are available on the market?

Thanks
Tim

Re: programmable relay for redundancy purpose

PostPosted: Fri Oct 27, 2017 10:31 am
by rimai
There are many of these available in the market.
Search for time delay relay. I just bought one on eBay last month for a machine.

Re: programmable relay for redundancy purpose

PostPosted: Fri Oct 27, 2017 1:02 pm
by tngo
Thanks for the info Roberto. Found the following timer delay relay, but no manual . From the wiring diagram it looks like pin 7/2 are source power, 5/2 for the power delay output, and short 1/3 to reset timer?

Re: programmable relay for redundancy purpose

PostPosted: Fri Oct 27, 2017 1:57 pm
by rimai

Re: programmable relay for redundancy purpose

PostPosted: Sat Oct 28, 2017 9:52 pm
by tngo
Thanks Roberto.

Re: programmable relay for redundancy purpose

PostPosted: Tue Oct 31, 2017 11:29 am
by tngo
Ended up choosing the interval on relay version from Macromatic. They have about a dozen type of these delay relays. Nifty.

Tim