3/25/2021 3:13 AM | |
Joined: 10/9/2020 Last visit: 4/2/2024 Posts: 15 Rating: (0) |
Hi Folks, Here is a simplified Liquid Level and Pressure controller that I'm working on. I need to be able to use a centrifugal pump to fill a fill tank to a set level while draining liquid out. The fill tank is being filled to a height of 16" and the sensor is a 16" continuous level float. The fill tank holds 5gal max. I also want to be able to adjust the supply pressure from the pump via VFD (0-72PSI). I think I have the analog amps set correctly but I need help with correctly scaling the output values to the graph. My other question is if the PI Control is set correctly for filling a tank with the drain. I've tried setting it with the pre-set fill with drain #2 in the settings but wasn't sure if I need to adjust anything else. The response of the PI seems sluggish when tested in real life . Is there anyway to speed up the response. Does any PWM needed to be added to the output? I appreciate any help . Thanks AttachmentSimple Pressure and level control.pdf (509 Downloads) |
Last edited by: Cycltotron at: 03/25/2021 03:40:04 |
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3/25/2021 6:58 AM | |
Joined: 10/9/2020 Last visit: 4/2/2024 Posts: 15 Rating: (0) |
How do I save it as a ZIP file? |
3/25/2021 7:00 AM | |
Joined: 12/18/2014 Last visit: 5/25/2024 Posts: 33104 Rating: (4085)
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You must use a zip software like 7Zip, WinZip, WinRAR or other. |
Last edited by: ixo65 at: 03/25/2021 07:02:14 |
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3/25/2021 7:01 AM | |
Joined: 10/9/2020 Last visit: 4/2/2024 Posts: 15 Rating: (0) |
How do I save it as a ZIP file? That doesn't come up as an option when I save the program. |
3/25/2021 7:15 AM | |
Joined: 10/9/2020 Last visit: 4/2/2024 Posts: 15 Rating: (0) |
Thanks for the information. Here is the ZIP file. AQ1 is putting out 4-20mA into a span oontrol. The span control then outputs variable pneumatic air pressure to a 0-20PSI pneumatic diaphram valve. AQ is a 0-10vdc output to a Siemens Sinamics V20. I've got a more complex program that allows the VFD to use pressure control using 0-10V or a standard fixed digital input and pre-set 60Hz speed. I've started testing the PI control for the span gauge and it just seems to be sluggish when adjusting the air pressure to valve. The centrifugal pump can pump several GPM without restricting the flow. I'm hoping to limit flow to about 2-5GPM. AttachmentSimple Pressure and level control.zip (434 Downloads) |
Last edited by: Cycltotron at: 03/25/2021 07:22:32 |
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3/25/2021 8:09 AM | |
Joined: 12/18/2014 Last visit: 5/25/2024 Posts: 33104 Rating: (4085)
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Try this with the changed settings by the analog amplifiers.
AttachmentSimple Pressure and level control_V2.zip (472 Downloads) |
This contribution was helpful to1 thankful Users |
3/25/2021 8:46 AM | |
Joined: 10/9/2020 Last visit: 4/2/2024 Posts: 15 Rating: (0) |
Thanks I'll try it later this morning. |
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