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General/Basics

Rotary Measuring Technology

Temperature:Working temperature: Operating temperature: Is defined as the environmental tempera-ture, in which the encoder will produce the signals defined in the data sheets. Is defined as the environmental tempera- ture which the encoder can withstand with- out getting damaged.Definition according to DIN standards 32 878 Dirt/dust and humidity/water: The IP classification according to EN 60529 describes how the encoder is protected against particles and water. It is describedas an abbreviation ”IP” followed by twonumbers. The first digit defines the size of the parti- cles. The higher the number the smaller the particles. The second digit defines the resistanceagainst water. The higher the number, the higher the water pressure can be.Our encoders have a protection up to IP 67. These two tables summarise the most usedIP ratings: Protection against particles(first digit):Protection against water(second digit) Designation of

0not protected1protected against particles 50 mm and larger 0not protected1protected against vertically falling drops of water 2protected against particles 12,5 mm and larger3protected against particles 2,5 mm andlarger 2protected against falling drops of water up to 15° from vertical 3protected against water sprayed up to 60° from vertical 4protected against particles 1,0 mm and larger5protected against dust 4protected against water sprayed from all directions, limited ingress permitted5protected against low pressure jets from all directions, limited ingress permitted 6dust proof 6protected against strong jets of water, e.g. for use on ship decks, limited ingress permitted7protection against the affects of immersion between 15 cm and 1 m IP 69K acc. to DIN 40050 Part 9: protectedagainst high-pressure water/steam jet cleaning 8protected against long periods of immersion under pressure

colours

abbreviation colour BKblack VTvioletGYgrey

to DIN standard 757

BNbrown RDred WHwhite PKpink OGorangeYEyellow GDgoldTQturquoise GNgreen BUblue SRsilver

Installing encoders Encoders shafts and in turn their bearingsare subjected to loads for a variety of rea-sons:• Installation tolerances when mounting theencoders (radial and angular displacement)• Thermal changes, e.g. linear expansion ofthe drive shaft • Effects of wear, e.g. radial runout of the drive shaft or vibrations These load factors have a direct effect onthe life expectancy of the shaft bearings and on the quality of the signal.Facilities must therefore be provided duringinstallation to compensate for these forces.For encoders having a solid shaft this is generally done by using shaft couplings between the drive shaft and the encoder shaft. The solution with hollow shaft

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