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INTEGRATED DIAGNOSTIC SYSTEMabFigure 3a and 3b: The remainingservice life can also be outputdigitally via a PWM signal a) high, b)low or as an analogue value via anadditional RC element.mote measuring stations, radio buoys). With thenew options, the replacement intervals can beplanned in a timely manner or adapted to the individualrequirements. Fans no longer have to be“preventively” replaced, which reduces investmentand maintenance costs and increases operatingreliability.Real-world applications Instead of operatingon preset values, the new system uses data thatis updated on an ongoing basis, such as operatingspeed, ambient temperature and downtimes.Basic data, such as the bearing design (ball orsleeve bearing), the type of bearing lubricationand the grease used, and other ambient conditionsis preset. That way service life reserves canbe used, since the current forecast always takesinto account the overall history of the fan.The diagnostics system is based on empiricalcorrelations from real-world applications anddecades of endurance tests under various conditions.Customer-specific output formats, suchas L5 instead of L10, can be taken into account.The output can be wired out via either thealarm wire or an additional wire and can be calledup digitally. The remaining service life can alsobe output as an analogue value via a PWM signalto an RC element. Thus the product can beused nearly up to the actual end of its life withoutlosing reliability. That conserves resources,increases value creation and reduces costs ofprocuring replacements and maintenance costs(Figure 3a, b).The new diagnosticssystem not onlyconserves resourcesbut also reducesreplacements andmaintenance costsAuthors are Dipl.-Ing (Graduate Engineer) (FH) Frank Heller, DevelopmentEngineer for Hardware, Basic and Technology Development (left) and Dr.Lutz Ramonat, Research and Development Centre, Bearing Technology andReliability (right) at ebm-papst St. GeorgenYou would like more information on this topic? Please address your questionto: Lutz.Ramonat@de.ebmpapst.com or Frank.Heller@de.ebmpapst.comtechmag 01°201315