IEC61131-2-2017（部分）

1EC61131-2:2017©1EC2017-35-Table 8-Multiplication factors for equipment ambienttemperature of operation at altitudes up to 5 000 mAltitudeDerating ratio for temperature?m0to2000的1.030000,940000.850000.7Linear interpolation is allowed between altitudesNOTE These factors compensate for the reduction in cooling capacity of air athigher altitudes,due to lower density.Equipment ambient temperature rating at 2 000 mAtmospheric pressure and air density increases with decreasing altitude.Therefore utilization of the derating factor for 0 m to 2 000 m for altitudes belowsea level is considered conservative.EXAMPLE 1 If the operating ambient temperature of the equipment is 25C at 2 000 m,its operating ambienttemperature at 5 000 m 25C 0,7 17,5 C.EXAMPLE 2 If the operating ambient temperature of the equipment is 70C at 2 000 m,its operating ambienttemperature at 3 000 m 70 C 0.9 63C.The requirements of 5.2.2 are verified by the temperatures tests of Table 4 and by inspectionof the equipment manuals for deratings according to Table 8.5.3 Mechanical operating conditions and requirements5.3.1●GeneralExperience shows that equipment meeting these requirements are suitable for industrial use.For the purpose of this standard,the operating conditions are indirectly defined by thefollowing requirements which apply to fixed equipment as well as to unpackaged portable andhand-held equipment.They do not apply to equipment containing assemblies outside thescope of this standard.Fixed equipment is equipment which is part of the permanentinstallation.5.3.2VibrationsVibration immunity requirements for equipment in the scope of this document are shown inTable 9.Table 9-Sinusoidal vibration conditionsDisplacement3,5 mm constant displacement,5 sf<8,4 HzAcceleration10 m/s2(1 g)constant acceleration,8.4 sfs 150 HzAll amplitude figures are peak valuesThe break point frequency shall be adjusted to yield a smooth cross-over without discontinuity from the constantamplitude displacement requirement to the constant amplitude acceleration requirement.NOTE 1 g 10m/s2Vibration is applicable to each 3 mutually perpendicular axes.itemtional Becrotocmical Commission