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Inputs by Bill Corey Pentair Water Training Institute Last month, we talked about External Fault. Let’s discuss External Setpoint now. External Setpoint means I want to do something different then run the pump at the psi I normally run it at. There could be a few different reasons why I might. Let’s say I’m using 60 psi for my house, but I also have a sprin- kler system, and 60 psi is just a little too much for it. What do I do? Well, if I require a lower pressure to run my sprinkle system, or more than the house system for that fact, I choose to set the External Setpoint at a new higher or lower psi, but I still have to have a way to change to that psi. The PID drive has two Inputs which allow me to do different things than what the system might normally call for, so I hook up my timer clock from my sprinkler sys- tem (the Input takes 24 to 230 volts) to one of the Inputs, and then set that input for External Setpoint. Now, when the timer comes on, it will send a signal to the Input which now tells the drive it should change the pressure to the sys- tem. So it lowers or raises it to the External Setpoint and stays there until the timer says it is time to turn off the system. When the timer clicks to the off position, it removes the Input to the drive, and with the signal gone, the drive goes back to what it knew it should be, 60 psi. Of course, the sprinkler system is off and no one is using water and we now require 60 psi, so the drive tells the pump to spin fast enough to get the pressure up to 60 psi. Next, the drive goes into boost, and if the pressure stays at the new pressure, the pump goes to sleep. The next time the homeowner goes to use water, it will be at 60 psi. It is important to note, if the home- owner uses the water while the sprinkler system is on, the pressure is whatever the sprinkler system is set for, higher or lower. So we have looked at using the Inputs on the drive as an External Fault and External Setpoint; next, let’s look at the last thing I can do - Run. Bill Bill Corey may be contacted via e-mail at admin@ worldwidedrillingresource.com 71 WorldWide Drilling Resource ® OCTOBER 2013 Are You A Techie? Adapted from an Article at Street Talk America Is your smartphone permanently glued to the palm of your hand? If the following statements ring true to you, then you know you’re too high-tech. : You haven’t played solitaire with a real deck of cards in years. : You text your son to let him know dinner is ready, and he texts you back from his bedroom, “What’s for din- ner?” : You chat daily with a person from South Africa, but haven’t spoken to your next door neighbor in years. : You buy a computer and a week later it is out of date and only worth half of what you paid for it. : The idea of purchasing products with real money instead of credit or debit cards is absurd to you. : Second-day air delivery seems painfully slow to you. : Your reason for not staying in touch with family members is they do not have e-mail addresses.