Hello everyone, I am looking to set up a flood prevention system using my household water pump. The goal is to have the pump automatically shut off if the power consumption exceeds 3 kWh per day. For hardware, I am using a Siemens LOGO 6ED1 053-1FA00-0BA0 micro PLC along with a Sifam Tinsley AP25-1DO kWh meter, which has a pulsed output of 1 pulse per kWh. This output can be configured with pulse widths of 200/100/60 ms. Since the PLC inputs are AC and the pulsed signal is DC, I plan to use a solid state relay to activate input I3 of the PLC. I am unsure if a pulse width of 200 ms is sufficient for the PLC to detect the input. I have attached a copy of the program which is working in the simulator, but I still need to obtain a programming cable to download it to the PLC. Any assistance is appreciated in this matter. The program includes a Bypass Switch for system bypasses, a Float Switch for flood detection at the pump location, a Pulse Input from the kWh meter, and a Weekly Timer that activates daily at midnight with a delay before resetting for the next day.
In my previous experience, I have utilized the LOGO system and while I cannot offer a guarantee, I believe a 200ms pulse should be detectable. In a previous project, I implemented a setup where a cylinder switch activated the retraction process, which did not operate within a timeframe close to 200ms. For a more precise control, consider obtaining a DC timer programmed for OneShot mode to generate a 1-second pulse signal.
Thank you for responding. I recently searched in my garage and discovered a Brodersen UNIC XM with a DC coil. I will conduct a bench test on this and provide an update.
Stickman1019 inquired about using a Siemens LOGO 6ED1 053-1FA00-0BA0 micro PLC, which features 12 AC inputs and 4 AC outputs. However, it seems it actually has 8 relay outputs regardless of being AC or DC. If your flood protection is based on kilowatt-hours used and the pump consumes a consistent amount of power while running, consider using a timer instead of a kilowatt-hour meter. For instance, if the pump runs at 500 watts, you could set the timer to switch off the pump after it has run for more than 6 hours total in a day, resetting at midnight for the next cycle.
If you're unable to locate a datasheet for your exact model, consider referring to a newer version of the LOGO that specifies a 50ms response time for AC inputs. In this case, a 200ms delay should be more than sufficient.
I am using a kWh meter to accurately monitor my usage and have decided to upgrade to the 0BA8 model, which I believe will work better with the meter. You can find the upgrade option on eBay at the following link: https://www.ebay.ie/itm/27612312886.
Hello, your approach seems well thought out. Regarding your concern about the 200 ms pulse width - that should indeed be ample for the PLC to detect the signal, as long as the solid state relay doesn't introduce too much of a delay. If it does, you might need to consider using a relay with a faster response time. Don't forget to ensure that your relay is correctly interfaced to protect your PLC input from any potential over-voltage. Also, consider incorporating an auto alarm functionality to alert if the pump exceeds the expected power consumption and is auto-shut. That way, you'll be informed in real time rather than finding out later. Best of luck with your project!
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Answer: - The flood prevention system uses a Siemens LOGO micro PLC in conjunction with a Sifam Tinsley kWh meter to monitor power consumption of the household water pump. If the power consumption exceeds 3 kWh per day, the system automatically shuts off the pump.
Answer: - The hardware components include a Siemens LOGO 6ED1 053-1FA00-0BA0 micro PLC, a Sifam Tinsley AP25-1DO kWh meter with a pulsed output, and a solid state relay to activate input I3 of the PLC.
Answer: - The pulsed output of the kWh meter generates 1 pulse per kWh, with configurable pulse widths of 200/100/60 ms. A solid state relay is used to connect the DC pulsed signal to the PLC input I3, ensuring compatibility between the AC PLC inputs and DC pulsed signal.
Answer: - The adequacy of the 200 ms pulse width for the PLC to detect the input may vary based on the specific requirements and setup. It's important to test and verify the functionality to ensure proper detection and response.
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