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1. (WO2018197033) METHOD FOR DETECTING AN ABNORMAL OPERATING STATE OF A PUMP UNIT

Pub. No.:    WO/2018/197033    International Application No.:    PCT/EP2018/000120
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Wed Mar 28 01:59:59 CEST 2018
IPC: F04D 15/02
F04D 29/66
F04D 15/00
Applicants: WILO SE
Inventors: FIEDLER, Jens Olav
SANDERS, Tilman Philip
KIEL, Martin
OETTMEIER, Martin
MEIER, Benedikt
Title: METHOD FOR DETECTING AN ABNORMAL OPERATING STATE OF A PUMP UNIT
Abstract:
The invention relates to a method for detecting an abnormal operating state of a rotational-speed-controllable pump unit (1) operated at a specifiable rotational speed (n 0). A periodic excitation signal (fA(t)) of a certain frequency (f) is applied to a manipulated variable (nsoll) of the pump unit (1) in such a way that a hydraulic variable (H, Δp) of the pump unit (1) is modulated. From a mechanical and/or electrical variable (Pel) of the pump unit (1) as a system response (X(t)) to the excitation signal (fA(t)), an evaluation signal (I(t0), I(t)) is then calculated and it is determined therefrom whether an abnormal operating state exists. The invention further relates to pump electronics for the open-loop and/or closed-loop control of the target rotational speed of a pump unit (1), which pump electronics are designed to carry out the method, and to a pump unit having such pump electronics.