Schneider Electric PAS4S manual Service life, Positioning accuracy and repeatability

3 Technical Data PAS4•S

3.5Service life

The service life of the product is a function of the mean forces and tor- ques that act in the system. If multiple forces and torques act simultane- ously, use the following formula to calculate the loading factor k.

Fy		Fz		Mx			My			Mz
	+		+		+			+			= k
Fymax
	Fzmax		Mymax			Mymax			Mzmax

Fz

Mz

Fy

My

Mx

Fx

Figure 3.10 Forces and torques

The service life of the axis (in km) can be approximated using the load- ing factor and the service life - load characteristic curve.

The application-specific load values appear in the numerator.

The numerator contains the maximum permissible forces and torques. These forces and torques decrease at increasing velocities, see char- acteristic curves in chapter 3.

3.6Positioning accuracy and repeatability

Positioning accuracy and repeatability depend on temperature, load and velocity changes as well as the accuracy of the ball screw drive and the accuracy of the switching points of the sensors.

At steady temperature, speed and load, the repeatability amounts to ± 0.02 mm.

MNA1MLSDM00EN, V2.01, 07.2009

42 Portal axes with ball screw drive