Download Basic Information and Definitions

Basic Information and Definitions
Inductive sensors
Supply voltage UB
... is the permissible voltage range in which certain safe operation of the switch
is guaranteed (including ripple σ).It is indicated in the catalog section for each
product.
Rated
operating voltage Ue
... is the supply voltage UB used for testing without tolerances. To determine the
rated and limit values, the sensor must be operated using Ue. It is:
– for DC switches
Ue = 24 VDC
– for AC and
AC/DC switches
Ue = 110 VAC
– for AC and
AC/DC switches
Ue = 110 VAC
Voltage drop Ud
... is the voltage measured across the load of a closed (conducting) sensor at
load current Ie.
Rated insulation
voltage Ui
... of a proximity switch is the voltage to which the isolation tests and the creep
distances are referenced. For proximity switches the highest rated operating voltage must be considered as the rated isolation voltage.
Rated supply frequency
... of the power supply for AC devices is 50 to 60 Hz.
Ripple σ (%)
... is the AC voltage (peak-to-peak
of Ue) overlaid on the DC voltage
Ue given in percent. To operate DC
switches, a filtered DC voltage having a ripple of max. 15 % (per DIN
41755) is required.
Ue=rated operational voltage
Uss= oscillation width
Ripple σ =
956
Uss
× 100 [%]
Ue
Rated
operating current Ie
... is the permissible constant output current that may flow through the load Rl.
Off-state current Ir
... is the residual current flowing through the load when a proximity switch is not
conducting (open).
Max. inrush Ik
... in the case of alternating current indicates the current Ik (Aeff) which is permitted
to flow during a given turn-on time tk (ms) and at a given frequency (Hz).
Short circuit current
... is 100 A, i. e., per EN 60947-5-2 the power supply during testing in short
circuit mode must be able to provide at least 100 A for a short duration. This current is prescribed in the standard in order to test the short-circuit strength.
No-load supply current I0
... is the current, which flows in the switch, without the need for a load to be
connected (only with 3- and 4-wire-switches).This current supplies the sensor
electronics.
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