This was a great exercise! I don't have a lot of experience with Function Block or Structured Text so it was nice to see how the ladder program can be translated to the other languages.
Thanks for the video Tim. I was able to take the information I learned here, use it to write a program in CCW to control level in a condensate tank with a Micro820. Using a Micro820 and a 7in HMI was no more out of pocket than a PAX2C and the cards needed for it. With the Micro820 I have a much more useful processor that can handle the pump lead/lag logic. I don't have hard-wired relays in the cabinet any more and I can still use my analog input from the DP cell for the level input.
A programmable cycle timer on the lead pump alternating which pump is lead is useful in many applications such as irrigation where a complete pump down of the reservoir is no required.
Hi! Great video, I have been tasked with making an alternating lead/lag pump set up with an Allen Bradley Micro820 on CCW, only with 3 pumps, that also needs to include if either the current duty or standby fails it will swap to another available pump… can you help?
question i have a encoder on a conveyor line and need to mesure how long a box is that goes through the line i have photoeyes set up but my lead quit and im still newer to all of this can you help
I would latch the alarm lights so that if in your absence of monitoring and a high or low event occurred you would be aware of it. A press of the silence button would acknowledge the event. Pumping would funtion in the same method as you programed, just the light would be a like a historian.
I wouldn't :) I don't believe in evenly running pumps because that means that they evenly wear out. I don't even like using alternators. If I do, I don't do a 50/50 alternator like in this quiz. I do something where one pump runs much more than the other. But there are as many philosophies on alternating pumps as there are ways to program it. Great question John.
@@TimWilborne So I am curious your opinion on not running pumps “evenly. “ as we all know, especially in a situation like your quiz, that pumps don’t run the same amount of time even when their run time is distributed “evenly” through an alternator. I understand they break down evenly, but have always been under the belief that, theoretically, extends the life of your motors. Just curious. Great content as always
This was a great exercise! I don't have a lot of experience with Function Block or Structured Text so it was nice to see how the ladder program can be translated to the other languages.
Glad it was helpful Laura!
Thanks for the video Tim. I was able to take the information I learned here, use it to write a program in CCW to control level in a condensate tank with a Micro820. Using a Micro820 and a 7in HMI was no more out of pocket than a PAX2C and the cards needed for it. With the Micro820 I have a much more useful processor that can handle the pump lead/lag logic. I don't have hard-wired relays in the cabinet any more and I can still use my analog input from the DP cell for the level input.
Yes, it makes for a very flexible control system!
A programmable cycle timer on the lead pump alternating which pump is lead is useful in many applications such as irrigation where a complete pump down of the reservoir is no required.
That is a good one, I might have to put it on the quiz list. Thanks Joel!
I don’t know how to program but I understand the logic. I’m pretty happy that I understood how you rotated lead/lag logic.
Glad you could follow it!
Hi! Great video, I have been tasked with making an alternating lead/lag pump set up with an Allen Bradley Micro820 on CCW, only with 3 pumps, that also needs to include if either the current duty or standby fails it will swap to another available pump… can you help?
@TimWilborne is it somehow possible to get the .ACD file for the Lead_Lag demo?
Sure, all you have to do is follow the video and program it 😄
question i have a encoder on a conveyor line and need to mesure how long a box is that goes through the line i have photoeyes set up
but my lead quit and im still newer to all of this can you help
This project drove me crazy but it was a good challenge. I spent so much time on the ladder I hadn’t even touched the ST or FBD
As long as you learned something then it was worth while!
I would latch the alarm lights so that if in your absence of monitoring and a high or low event occurred you would be aware of it. A press of the silence button would acknowledge the event. Pumping would funtion in the same method as you programed, just the light would be a like a historian.
I should do a video on "logging" alarms in an array.
Could you use a ONS to operate the lead/lag?
The one shot to alternate the pumps is in rung 0, is that what you are talking about?
How would you distribute workload over a "pool" of pumps so that they maintain similar hours ?
I wouldn't :) I don't believe in evenly running pumps because that means that they evenly wear out. I don't even like using alternators. If I do, I don't do a 50/50 alternator like in this quiz. I do something where one pump runs much more than the other. But there are as many philosophies on alternating pumps as there are ways to program it. Great question John.
@@TimWilborne
So I am curious your opinion on not running pumps “evenly. “ as we all know, especially in a situation like your quiz, that pumps don’t run the same amount of time even when their run time is distributed “evenly” through an alternator. I understand they break down evenly, but have always been under the belief that, theoretically, extends the life of your motors. Just curious. Great content as always
Can you help me If I need to do programming for 3 pumps instead of 2 pumps ?
It would be the same, just add another pump and float and do it the same way as the lag pump.
@@TimWilborne without adding new float with the same low float signal we need to do ?