Maik Fuchs
Member
Hi, I need to control 6 pumps in a cascaded control. I read some threads about controlling 2 pumps, but how about 6?
The pumps are all the same with a max. flow of 300 m3/h and all have a vfd. The pumps are used to deliver cooling water for 10 evaporators. The water is pumped from a nearby chanel.
This is what I think how it should work so far:
The first pump starts with a PID controller which controls the pressure. If the PID reaches >90% for some time start the second pump. So far so good. Then what? Control both pumps with the PID controller? And start them with e.g. 60%?
And what if the third pump is needed?
Is it a good idea to control all 6 pumps with the same PID contoller? This way all pumps have the same speed.
The pumps are all the same with a max. flow of 300 m3/h and all have a vfd. The pumps are used to deliver cooling water for 10 evaporators. The water is pumped from a nearby chanel.
This is what I think how it should work so far:
The first pump starts with a PID controller which controls the pressure. If the PID reaches >90% for some time start the second pump. So far so good. Then what? Control both pumps with the PID controller? And start them with e.g. 60%?
And what if the third pump is needed?
Is it a good idea to control all 6 pumps with the same PID contoller? This way all pumps have the same speed.