Self-regulating open circuit pump unit

A system comprising:

• one or more controllers configured to:
• determine, for a system load having a first parameter comprising a pressure parameter and a second parameter comprising a flow parameter in which the first parameter and the second parameter are correlated, a first setpoint of both rated total value of the system load for the first parameter and rated total value of the system load for the second parameter;
• determine a second setpoint of both a minimum partial percentage of the rated total value of the first parameter at a percentage over 100% of the rated total value of the second parameter;
• and
• select a variable speed device having control curve information dependent on at least the first parameter and the second parameter which has a variable controllable motor having a power capacity which minimally satisfies power required to achieve the first setpoint and the second setpoint.

A non-transitory computer readable medium comprising instructions which, when executed by one or more controllers, cause the one or more controllers to perform a method, the instructions comprising:

• instructions for determining, for a system load having a first parameter comprising a pressure parameter and a second parameter comprising a flow parameter in which the first parameter and the second parameter are correlated, a first setpoint of both rated total value of the system load for the first parameter and rated total value of the system load for the second parameter;
• instructions for determining a second setpoint of both a minimum partial percentage of the rated total value of the first parameter at a percentage over 100% of the rated total value of the second parameter;
• and
• instructions for selecting a variable speed device having control curve information dependent on at least the first parameter and the second parameter which has a variable controllable motor having a power capacity which minimally satisfies power required to achieve the first setpoint and the second setpoint.