Control of the electric motors of a pump unit of a fire protection system
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United States of America Patent
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Apr 5, 2016
Grant Date -
Sep 5, 2013
app pub date -
Oct 21, 2011
filing date -
Nov 8, 2010
priority date (Note) -
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Abstract
A fire protection system is provided including spray nozzles a pump unit, a control system with pressure-measuring mechanism, and piping for conducting extinguishing medium from the pump unit to the spray nozzles. The pump unit includes pump drives, each of which comprises a pump and an AC electric motor. The AC motor can be connected to an AC electricity network via a contactor device, in which pump unit the AC electric motors are controlled on the basis of the pressure measured in the piping. One of the electric motors is controlled by means of a frequency converter such that the motor steplessly adjusts pressure and the others are started up into the network as steplessly adjusting motors.
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