Operating Instructions

PSR-CT
64 / 69 PHOENIX CONTACT 108366_en_01
A Technical appendix
A 1 Explanation of switching distances
Assured operation distance S
ao
according to EN 60947-5-3
(Description adapted)
Distance from the active surface of the sensor, within which the presence of the actuator is
properly detected, while considering all specified ambient conditions and tolerances.
Assured release distance S
ar
according to EN 60947-5-3
(Description adapted)
Distance from the active surface of the sensor, outside of which the absence of the actuator
is properly detected, while considering all specified ambient conditions and tolerances.
Typical switch-on distance S
typ
Typical distance for switching on safety outputs.
Switching hysteresis
Defined distance range in which the sensor detects the actuator, but does not initiate a
switching operation of the safety outputs. In this way, the switching hysteresis prevents unin-
tended switching of the safety outputs in the case of vibrations.
Repeat accuracy
The switching operation at a certain switching distance is repeated with this accuracy in the
case of the same switching distance.
Figure A-1 Schematic view of the switching distances
For detailed values of the switching distances, please refer to Table 3-1 “Minimum dis-
tances and switching distances” in Section “Positioning and distances” on page 26.
on
off
Distance
S
ao
S
typ
S
ar
Outputs
Actuator moves away
Actuator approaches
Switching
hysteresis