Definitions: The humidity depends on the quantity ofwater vapour in suspension in the air, hence the climatic conditions.When the pressure of the water vapourcontained in the atmosphere equals the maximum pressure (increasing temperature function) of the water at ambient temperature, saturation occurs. Absolute humidity (in g/m Measuring the humidity: The humidity is measured with two accurateventilated industrial thermometers, one dry, the other wet (its industrial bulb is wrapped in a wad of cotton wool soaked in water). The drier the atmosphere, the greater thedifference in temperature.The absolute humidity, a function of readingboth thermometers, is determined from the chart.To determine the humidity correctly, a goodair flow is required for stable readings, and accurate readings must be taken on the thermometers. P 12

GEARLESS A.C. drive for elevators Synchronous with permanent magnets - Z rangeEnvironment

Environmental limitations

NORMAL CONDITIONS OF USE

According to IEC 60034-1, standard motorscan operate in the following normalconditions:• ambient temperature within the range +5and + 40 °C• altitude less than 1000 m • atmospheric pressure: 1050 m bar • operating zone 2 (absolute humiditybetween 5 and 23 g/m : (see chart on nextpage).• ambient air chemically neutral and dust-free

CORRECTION AS A FUNCTION OF THE ALTITUDE AND AMBIENT TEMPERATURE

For different operating conditions, youshould apply the power correction coefficient indicated on the chart opposite, maintaining the thermal reserve.The ratio /P gives the correction coefficient. P : corrected power P : catalogue power â–¼ Correction coefficients as a function of the altitude and ambient temperature.

RELATIVE AND ABSOLUTE HUMIDITY

It is vital to take account of the climaticoperating conditions. The level of humidity inthe atmosphere and the ambient temperature call for different constructions.LEROY-SOMER has implementedprocedures for manufacturing machines according to the different parameters. To simplify your selection and still obtain a machine suitable for your environment, you will find below all the elements to help you determine in which zone your machine is located. ):weight of water vapour contained in the air.Relative humidity (%):ratio between the mass of water vapourcontained in a given volume of air and what this volume would contain, at the same temperature and at the same pressure, if it were saturated. It is sometimes called hydrometric status. This is given by the simplest measuring instruments.These two values are linked. If you do not have a special measuringinstrument, you can use the two- thermometer method described below.
P 1 / P Alt 4 000 m Alt 3 000 m Alt 2 000 m Alt 1000 m 3 Alt 4 000 m Alt 3 000 m 1 T amb ( C) Alt2 000 m 2060503040 Alt 1 000 m 1.1 0,80,9 1 1 3