User Manual

Info card
Inductive sensors
UK
Important terms
Active Zone / Active face Area over the sensing face in which the sensor reacts to the approach
of the target.
Output function
Normally open: Object within the active zone – output switched.
Normally closed: Object within the active zone – output blocked.
Programmable: Choice between normally closed or normally open.
Positive switching: Positive output signal (to L–).
Negative switching: Negative output signal (to L+).
Power-on delay time The time the sensor needs to be ready for operation after application
of the operating voltage (in the millisecond range).
Hysteresis The difference between the switch-on and the switch-off point.
Leakage current Current for the internal supply of 2-wire units, also flows through the
load when the output is unswitched.
Current consumption Current for the internal supply of 3-wire DC units.
Switch point drift The shifting of the switch point owing to changes in the ambient
temperature.
Short circuit protection ifm sensors which are protected against excessive current by means
of a pulsed short-circuit protection. The inrush current of incandescent
lamps, electronic relays and low resistance loads may cause this
protection to cut in and turn the switch off!
Operating voltage The voltage range in which the sensor functions safely. A stabilised
and smoothed direct voltage should be used! Take into account
residual ripple!
Switching frequency Damping with standard target (mild steel) at half nominal sensing
range. The damped – undamped ratio is 1 : 2.
Sensing range
Nominal sensing range s
n
:
design range of the unit
Real sensing range s
r
:
individual deviations at room
temperature between 90 % and 110
% of s
n
Useful sensing range s
u
:
switch point drift
between 90 % and 110 % of s
r
Operating distance s
a
:
safe switching
between 0 and 81 % of s
n
s
u
s
n
s
r
s
a
+10%
10%
+10%
10%
St 37
Correction factors
(Exception K1 units:
Constant sensing range on all
metals)
S
r
[%]
100
50
0
mild steel
stainless
steel
brass
Al
Cu
Configuration
of cables and connectors
Colours: BK: black, BN: brown, BU: blue, WH: white
Standard configuration for 3-wire DC:
Cable Terminal chamber US-100-plug
L+ BN 1 / 3 pin 1 / BN
L– BU 2 / 4 pin 3 / BU
Output BK X pin 2 / WH
pin 4 / BK
2-wire quadronorm units:
Cable Terminal chamber US-100-plug
WH — 1 / 4
BK — 1 / 4
Pin configuration of the
US-100 connectors (view
onto the plug at the unit)
pin 4: BK
pin 1: BN
pin 3: BU
pin 2: WH
For the cable and the pin configuration as well as the unit data of
special versions please refer to the wiring diagrams in our main position
sensors catalogue or on our website.
i
This info card is to be regarded as a supplement to the main position sensors catalogue and to the
individual data sheets. For further information and contact addresses please visit our homepage at
www.ifm.com.
1 D 2226/02 08/2008