Glossary
Design Resolution
The theoretical minimum movement that can be made. Design resolution must not be
confused with minimum incremental motion. In indirect position measurement methods,
values for drive screw pitch, gear ratio, motor or sensor/encoder resolution, for example, are
included in the calculation of the resolution. Normally, the design resolution is considerably
below the minimum incremental motion of the mechanics. In direct measurement methods,
the resolution of the sensor system is specified.
Lateral Force
Also: lateral load capacity
Maximum permissible force orthogonally to the positioning direction. This value is valid
directly for the motion platform and is reduced when the force acts above the platform.
Limit Switch
Each limit switch sends its signal to the controller on a dedicated line. The controller then
interrupts the motion avoiding that the positioner moves until the hard stop and gets
damaged. PI positioners have mechanical, noncontact optical or Hall-effect limit switches.
Load Capacity
Maximum load in the vertical direction when the V-412.xx6025E0 is mounted horizontally.
The contact point of the load is at the center of the motion platform.
Reference Switch
Many of the positioners are equipped with a direction sensing reference switch positioned
approx. in the middle of the travel range. It is recommended to approach the reference
switch always from the same direction to obtain best position repeatability.
Function: Optical, magnetic
Sensor resolution
The sensor can be the critical element of position resolution so it may be necessary to
specify the sensor resolution separately. Rotary encoder: Impulses per screw rotation. Linear
encoder: Smallest motion still detected by the sensor system.
Travel Range
The maximum possible travel range is limited by the length of the drive screw. A possible
gap between the limit switches determines the travel range.
V412M0008EN
‒
5/11/2020
39
M O T I O N | P O S I T I O N I N G
