Elevatori Magazine 3-2023

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equivalent to classical drives are achieved, as well as avoiding unnecessary dissipation due to the above-mentioned partialisation. Plotting power consumption, the motion in the different cases, we can see that in traditional electromechanical drives, the absorbed power is pretty much constant throughout the high and low speed modes; the electronic valve, by reducing the low speed times, allows for shorter power supply times, (with an obvious reduction in absorbed power), while the inverter, in addition to a further optimisation of times, varies the required power with a curve similar to that of the motion. Obviously, one must consider that the use of inverters increases stand-by consumption in the order of magnitude of 40W - 60W, which corresponds to approximately 1 kWh/day. si riescono ad avere dei tempi di percorrenza equivalenti agli azionamenti classici, oltre a evitare inutili dissipazioni dovute alla suddetta parzializzazione. Diagrammando le potenze e il moto nei vari casi, possiamo notare che negli azionamenti elettromeccanici classici la potenza assorbita è praticamente costante durante tutto il modo di alta e bassa velocità; la valvola elettronica, riducendo i tempi di bassa, permette tempi di alimentazione minori (con ovvia riduzione di potenza assorbita), mentre l’inverter, oltre a una ulteriore ottimizzazione dei tempi, varia la potenza richiesta con una curva simile a quella del moto. Ovviamente va considerato che l’uso di inverter aumenta i consumi in stand-by nell’ordine di grandezza di 40- 60 W, corrispondenti a circa 1 kWh/giorno. Solenoid valve Valvola elettromeccanica Electronic valve Valvola elettronica Difference in Kwh Differenza in Kwh Valve with inverter Valvola con inverter Difference in Kwh Differenza in Kwh © 2020 GMV Spa Comparison of motion/power curves with solenoid valves, electronic valves and valves with inverter in the different cases; the differences in consumption are in blue. / Confronto curve moto/potenza con valvola elettromeccanica, valvola elettronica e valvola con inverter; è indicata in azzurro la differenza di consumi. SYSTEMS MANAGEMENT WITH SHORT INTERFLOOR DISTANCES Electromechanical valves present difficulties in the management of short interfloor distances. Electronic valves, on the other hand, allow motion at intermediate speeds, as long as the switchgear can handle them, and knowing whether they involve short or long runs. With traditional GESTIONI IMPIANTI CON INTERPIANI RAVVICINATI Le valvole elettromeccaniche presentano delle difficoltà nella gestione di interpiani corti. Le valvole elettroniche invece consentono il moto a velocità intermedie, a patto che il quadro riesca a gestirle, sapendo se va incontro a corse brevi o lunghe. Con le valvole classiche gli 42 ELEVATORIMAGAZINE.COM 2023 MAY | JUNE • MAGGIO | GIUGNO 2023
valves, short interfloors are managed entirely at low speed, when we know the most significant causes of dissipation are generated (increased oil heating), resulting in waste of energy. interpiani corti vengono gestiti interamente in bassa velocità, momento in cui sappiamo esserci le massime cause dissipative (maggiore riscaldamento olio) e quindi spreco di energia. Electronic valve / Valvola elettronica Vn = Nominal speed / Velocita’ nominale Vi = Intermediate speed / Velocita’ intermedia © 2020 GMV Spa Differences in motion when using an intermediate speed for a short run with electronic valves. Differenze di moto con l’utilizzo di velocità intermedie per corsa corta con valvola elettronica. TYPES OF OILS USED IN HYDRAULIC SYSTEMS First of all, it is necessary to define the concept of viscosity index VG as a characteristic of the oil, understood as the variation of viscosity as a function of temperature. Oils designated by the abbreviation VG have a low viscosity index, while HVG have a high viscosity index. Having a low viscosity index often results in the need for oil TIPI DI OLIO UTILIZZATI NEGLI IMPIANTI OLEODINAMICI Occorre innanzitutto definire il concetto di indice di viscosità VG quale caratteristica dell’olio, intesa come variazione della viscosità in funzione della temperatura. Gli oli designati dalla sigla VG hanno un indice di viscosità basso, mentre gli HVG, alto. Avere un basso indice di viscosità comporta spesso la necessità di resistenze scalda NEL PASSATO E VERSO IL FUTURO SCHAEFER È SEMPRE AL TUO FIANCO SCHAEFER S. r. l. | Via G. Stephenson n. 94 | 20157 Milano | Italia 2023 MAY | JUNE • MAGGIO | GIUGNO 2023 Phone +39 02 841 79870 | Fax +39 02 841 79872 | info@ws-schaefer.com https://wsschaefer.com ELEVATORIMAGAZINE.COM https://schaefer-products.com 43
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