Hello everyone! If you have a logic for three pumps (lead, lag, off), could you kindly send it to me via email? Your help would be greatly appreciated!
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Thank you, James. I am currently utilizing an L81 PLC and I am interested in learning how to effectively alternate between pumps using an HMI interface. Specifically, I am looking to understand how to switch the lead pump from P1 to P2 when the operator selects P2 as the lead pump, automatically turning off P1 in the process. I am not seeking start/stop logic, but rather seeking guidance on how the operator can choose between lead, lag, and off settings for the pumps. If this is possible to be implemented in ladder logic, that would be preferable for me. Once again, thank you for your assistance.
Implementing logic to control multiple pumps can be achieved through three distinct pieces of logic. The first component determines the number of pumps running at a given time, following a simple start/stop circuit pattern. The second component dictates which pump should operate when there is more than one pump running. This selection is done through a single bit known as "Pump2_is_Lead," where a value of 1 designates Pump 2 as the lead pump, and a value of 0 designates Pump 1 as the lead pump. To toggle between the pumps, a flip/flop circuit triggered by an HMI button press is utilized. The final piece of logic actually controls the operation of the pumps based on the values of the previously mentioned bits. If "bitRun" is set to 1 and "Pump2_is_Lead" is also 1, Pump 2 will run while Pump 1 remains inactive. Conversely, if "bitRun" is 1 and "Pump2_is_Lead" is 0, Pump 1 will operate while Pump 2 is idle. If "bitRun" is set to 0, neither pump will run. It is essential to separate the control of when to run a pump from the decision of which pump to run. By implementing these isolated models and combining them effectively, the pumps can be efficiently managed. For more information on this topic, you can search for keywords like "Alternating Outputs," "flip-flop," and "wig-wag."
In the context of controlling three pumps, there are three main pieces of logic to consider. The first piece determines the number of pumps running, typically with a start/stop circuit pattern controlling a bit called "Run." The second piece decides which pump should run when there are pumps in operation, utilizing a bit labeled "Pump2_is_Lead." This bit determines whether Pump 1 or Pump 2 is the lead pump. The third piece actually controls the operation of the pumps based on the values of the "Run" and "Pump2_is_Lead" bits. To address the situation where a third pump, P3, is introduced and the operator selects it as the lead pump, adjustments need to be made in the programming. This scenario requires determining when each pump should be running and which pump should be the lead. By separating the control of when to run a pump from the decision of which pump to run, the system can effectively manage the operation of all three pumps. Additionally, implementing an HMI/PLC pattern where the HMI triggers the logic and the PLC handles the execution can streamline the process.
How can you switch between lead, lag, and off status for the pumps? Is there a specific sequence with transitions like 1=lead; 2=lag; 3=off; transitioning to #2=lead; 3=lag; 1=off; then transitioning to #3=lead; 1=lag; 2=off; or is there another process in place? The concept is similar to what was proposed, but the status is stored as integers and comparisons are used instead of direct connections. For example, IF (pump_count_to_run > 0 AND pump_1_leadlag=0) OR (pump_count_to_run > 1 AND pump_1_leadlag<2) THEN
Sure, happy to help with this! I've worked on a system where we need to switch between lead, lag and off states for our pumps. I don't want to share my email publicly though, so could you maybe DM me your email or is there a way I could share my logic here in the forum that would be beneficial to everyone?
Hey there! I'd be happy to share some insights about a three-pump logic system; it’s a pretty useful setup for maintaining operations if one pump fails. However, the forum rules prevent us from sharing personal emails. But don't worry, I can explain it right here! Let's begin: usually, the lead pump handles the majority of the work, the lag pump comes on when demand increases or if the lead fails, and the off pump is a backup in case the first two are out. But remember, specifics can vary based on demand, pump specs and control systems.
Hey there! Happy to lend a hand, but it's generally safer and more courteous to share detailed solutions or codes through the forum instead of directly sending via email. That way, everyone can learn and contribute! So, regarding the three pump logic, consider setting your lead pump to turn on first, and when demand increases, your lag pump kicks in. The 'off' mode is for when demand drops below the set point. Key here is to balance your pump operations to avoid too frequent or prolonged run times. Hope this gives you a start!
Hey there! While I'm not comfortable sharing my email in a public forum, I'd be more than happy to help you out right here. Could you provide some more context about the logic you're seeking? It'd be easier to guide you if I know the specific application of these pumps and any unique operational requirements you might have.
Hey! While I can't send you an email, I'd be happy to help out here. A common logic for a three-pump system involves using the lead pump to handle most of the load, switching to the lag pump when the lead reaches a certain flow rate or pressure threshold, and keeping the third pump off as a backup. You can also set up a rotation schedule to ensure even wear and tear on all pumps. If you have any specific requirements or parameters, I'd be glad to discuss those further!
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Answer: Answer: The lead, lag, and off pump logic is commonly used to efficiently manage multiple pumps in a system, ensuring redundancy and optimal operation.
Answer: Answer: The lead pump is usually the primary pump that operates first, followed by the lag pump if additional capacity is needed. The off pump remains idle until required, serving as a backup.
Answer: Answer: Implementing lead, lag, and off pump logic involves creating a structured program in the Controllogix5000 environment, assigning roles and priorities to each pump based on the system requirements.
Answer: Answer: It is essential to carefully plan the operation sequence, ensure proper interlocking and fault handling mechanisms, and perform thorough testing to validate the functionality of the lead, lag, and off pump logic.
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