5/20/2009 10:11 PM | |
Posts: 21 Rating:
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I’m trying to do a routine for controlling solar heating of my swimming pool. The idea is to have three states for a pump and a valve (stop, run, auto). The pump auto is a timer, and the valve auto is two PT100 (T1, pool water and T2, solar heater) which opens if T2 is more than T1 and closes if T1 is more than T2. I also have some safety with one leakage sensor and one pressure sensor. The leakage sensor sends a signal if there is a water leakage on the floor, and the pressure sensor (analog 4-20mA) should stop the unit when over or under the on/off thresholds. So far so good. I think I got the most of it right but I have a few problems. When T1<T2 the valve opens, when T1>T2 the valve closes, but when T1=T2 there is no signal at all. I want the valve to close at T1=>T2. There should be no state where the valve is without a signal. Any ideas on how I should do? I am a total newbie so you have to explain like to an ***... ;) I have no idea what gain, offset and so on means. I haven’t got the pressure guard to work. I have a on/off threshold that works but the function has to be delayed some way because right when the pump starts the pressure is zero and that should cause the system to stop, which is no good . The pump must run for 30s before the pressure check kicks in and if the pressure then is OK the pump keeps on running. If the pressure goes under or over the limits the system should halt and not restart before it is reset manually. I have just tested a little bit In the demo of V6.1 since I haven’t got my ordered unit yet. If you take a look on the diagram I’m sure you experts will understand what I’m looking for. Any tips and ideas on how to make it better are gratefully received. Regards D Attachmentversion1.zip (561 Downloads) |
5/22/2009 3:21 PM | |
Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating:
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Hi Drogen, look at the attachment for a solve of your question about save the pump... Look also at the following link to get a full solution to controll your valve with two temperatures...my solution contains a PWM based 3 point stepper controller with protektion of the two outputs... mixing valve Best regards Betel Attachmentversion1b.zip (580 Downloads) |
Last edited by: Betel at: 5/22/2009 3:33 PMadd attachment ==> Meine TAG-Listen: "deut." |
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