Using Pumps in Parallel Mode
When two pumps operate in parallel, there is the possibility of using two converters that are activated sequentially. This means that if one of the pumps exceeds its maximum flow, and the pressure mode cannot be maintained, the second pump starts. As a result, both pumps maintain water flow at the required pressure. During the flow adjustment process, the pumps accordingly respond to changes in speed until the flow decreases to such an extent that the second pump is no longer needed, and it shuts down, leaving the first pump running.
Constant Pressure with One Pump
In cases where we have one pump with sufficient capacity that operates in conjunction with several irrigation blocks or sprinkler lines, we can regulate the flow and maintain a stable working pressure. When there is a need to reduce the flow, the pump speed slows down, and the flow decreases. Meanwhile, the motor remains at a point that is as close as possible to the pump's characteristic curve. If the system requires a larger volume of water, the pump will increase the flow while constantly maintaining stable pressure.
Using Frequency Converters
It seems that the issue of variable flow and constant pressure can be addressed using a single frequency converter along with traditional starters for other motors.
Positive and Negative Aspects
Each of these scenarios has both positive and negative sides, so it is important to take into account the specific conditions of use.