Xylem IP Holdings, LLC

Xylem Europe Gmbh

Martin Larsson

Jürgen Mökander

Alexander Fullemann

Martin Zetterquist

A pump station arrangement and a method for turning off a pump configured for pumping liquid via a conduit. The pump, before being turned off, being driven at an operational frequency (F) by a control unit. The method is characterized by the steps of, ramping down the frequency of the pump due to a turn off instruction, the terminal frequency of the ramping down being equal to the operational frequency (F) of the pump minus at least 10 Hz and the ramping down time being at least a reflection time (T) for the conduit in question, and the terminal frequency of the ramping down not being less than 10 Hz, and stopping the pump after the ramping down.

Method for shutting off a pump as well as pump station arrangement

A method for automatic mutual alternation between an arbitrary number of pumps by the control of each individual pump, which makes use of a start condition for a state change from an inactive state of the pump into an active state of the pump to be performed, as well as makes use of a stop condition for a state change from the active state into the inactive state to be performed. The method includes a sub method (Find start condition) that includes the step of, after a predetermined stage, arbitrarily changing the start condition of the individual pump within predetermined limits.

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Sundbyberg, Sweden

Martin Larsson