PLC Controlled Arowana Tank
- Thread starter arowanaman85
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- arowana
So continueing I have it working for level control and water changes now, getting ready to add hmi, then adding 2 thermocouples for temperature control, going to use an old 120v hotwater tank and an additional solenoid for water heating have code in to prevent raising code 1 degree over 6 over period code is work in progress parts will be in later this week
Had to redo filters, original ones leaked like crazy
Had to redo filters, original ones leaked like crazy
On plumbing coming in on 1/2" pex to filters coming out to a Tee for draining when doing filter changes and flushes, to a check valve to prevent water coming back into house, to a solenoid NC 1/4" to 1/4" food grade hose, then into the overflow.
On the PLC side comes out the PLC to a 24v relay to a 120v relay to keep the solenoid from touching the plc.
two float switches in series for high and low. only one switch needs to trip to open for control on high or low, inverted NC and NO for high and low.
Adding light control, PLC doesn't have a clock so I'll use a timer to turn on a relay twitch to 24v to input and reset a timer that counts to 24 hours, for a clock
3 light circuits
then for heating have an additional solenoid with 30 seconds on, then 3 minutes off (for mixing reaction time of hot water with cold water. Though once the hot water goes in should trip out the thermocouple fairly quickly. have to play with it once its installed, probably needs dead bands
On the PLC side comes out the PLC to a 24v relay to a 120v relay to keep the solenoid from touching the plc.
two float switches in series for high and low. only one switch needs to trip to open for control on high or low, inverted NC and NO for high and low.
Adding light control, PLC doesn't have a clock so I'll use a timer to turn on a relay twitch to 24v to input and reset a timer that counts to 24 hours, for a clock
3 light circuits
then for heating have an additional solenoid with 30 seconds on, then 3 minutes off (for mixing reaction time of hot water with cold water. Though once the hot water goes in should trip out the thermocouple fairly quickly. have to play with it once its installed, probably needs dead bands
No idea what I'm looking at here, but it is pretty awesome. Show more natural light pics of tank ... the pink is ...
so finding:
i am running the new water into the overflow, i also was keeping some small fish in the overflow, served two purposes, it entertained my big fish and they kept the overflow clean.
Well i ran the system on manual for 10-15 minute and wasn't paying attention, temp in the overflow dropped to 45F tank stayed at 80F but fish in overflow, they didn't make it.
So working on PIDish control, adding a second solenoid, and added a hotwater tank, have the water coming out the filters going into hot water tank then back through a second filter and solenoid to mix with the cold water.
going to test in a few days, hotwater tank had been laying around so i've been cooking it and draining it to get it ready for use. Lot of valves inplay for isolating and draining the different pieces of this system.
idea right now, have two thermocouples to 4-20ma going to analog input card.
Grab temperature and hold, update temperature holding after solenoids are closed for 1 hour
When current temp drops 5F from holding temp, open hot water solenoid, when temp is => holding temp, deenergize solenoid.
sure it will need tweaking, ran some numbers on mixing temp and think i'll get 90-93F coming out with water mixed, but not taking into account pressures. So that mixing with the 81F in my tank should take a while to increase the temp 5F in the overflow, and with the switching back and forth should have minimal temp change in over all tank. Goal is to be able to run this system for a water change.
Also finishing up HMI and lights added some more switches to box. and playing with idea have putting in a larger sump in basement with larger pump and vfd control on pump...but that is a bit extreme...
i am running the new water into the overflow, i also was keeping some small fish in the overflow, served two purposes, it entertained my big fish and they kept the overflow clean.
Well i ran the system on manual for 10-15 minute and wasn't paying attention, temp in the overflow dropped to 45F tank stayed at 80F but fish in overflow, they didn't make it.
So working on PIDish control, adding a second solenoid, and added a hotwater tank, have the water coming out the filters going into hot water tank then back through a second filter and solenoid to mix with the cold water.
going to test in a few days, hotwater tank had been laying around so i've been cooking it and draining it to get it ready for use. Lot of valves inplay for isolating and draining the different pieces of this system.
idea right now, have two thermocouples to 4-20ma going to analog input card.
Grab temperature and hold, update temperature holding after solenoids are closed for 1 hour
When current temp drops 5F from holding temp, open hot water solenoid, when temp is => holding temp, deenergize solenoid.
sure it will need tweaking, ran some numbers on mixing temp and think i'll get 90-93F coming out with water mixed, but not taking into account pressures. So that mixing with the 81F in my tank should take a while to increase the temp 5F in the overflow, and with the switching back and forth should have minimal temp change in over all tank. Goal is to be able to run this system for a water change.
Also finishing up HMI and lights added some more switches to box. and playing with idea have putting in a larger sump in basement with larger pump and vfd control on pump...but that is a bit extreme...
Temperature controller keep burning out, not sure why, trying an alternative now. Going to put in a normal aquarium controller and use the heat relay as a signal to turn off the solenoid,
also thinking I might reverse it and use the cooling contacts as a permissive to energize the solenoid. pictures coming soon
also thinking I might reverse it and use the cooling contacts as a permissive to energize the solenoid. pictures coming soon
