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Operating instructions
Safety sensor
3.3 Switching distance
The graphs show the switch-on and switch-off points of the sensor
due to the approach of the actuator. The maximum misalignment of
the actuator with regard to the sensor centre is 7 mm. A concealed
mounting of the sensor and the actuator will reduce the switching
distance.
V
S [mm]
S
10
8
5
0
[mm]
-8
-7
-6
-5
-4
-3
-2
-1
0
Typical response range of the EX-CSS 180 sensor
s
switching point
ON
s
switch-off point
off
S
hysteresis range
h
s
= s
– s
H
OFF
ON
S
Assured switching distance
ao
S
Assured switch-off distance
ar
3.4 Adjustment
The LED in the end cap of the safety sensor can be used as adjustment
tool. The yellow flashing LED of a sensor signals if an adjustment of the
switching distance is required. Reduce the distance between the sensor
and the actuator, until the LED in the end cap of the safety sensor is
continuously lit yellow. In this position, a reliable switching position
of the sensor is obtained. (also refer to "Operating Principle of the
Diagnostic Outputs").
The proper functionality must always be checked by means of the
connected safety-monitoring module.
4
Key
S = switching distance
V = axial misalignment
S
ar
S
OFF
S
ON
S
ao
1 2 3 4
5 6 7 8
V [mm]
4. Rear side Electrical connection
4.1 General information for electrical connection
The electrical connection may only be carried out by
authorised personnel in a de-energised condition.
The power supply for the safety sensors must provide protection
against permanent over-voltage. Under fault conditions, the voltage
must not exceed 60 V. supply units according to IEC 60204-1 is
recommended.
The safety outputs can be integrated into the safety circuit of the control
system. For applications of PL e / control category 4 to ISO 13849-1,
the safety outputs of the safety sensor or sensor of the chain must be
wired to a safety monitoring module of the same control category .
Requirements for the connected safety-monitoring module:
• Dual-channel safety input, suitable for p-type safety sensors with NC
function.
The safety-monitoring module must tolerate internal functional tests of
the sensors with cyclic switch-off of the sensor outputs for max. 2 ms.
The safety-monitoring module must not be equipped with a cross-wire
detection function. Short-circuit recognition by the evaluation is not
necessary.
Information for the selection of suitable safety-monitoring
modules can be found in the Schmersal catalogues or in the
online catalogue on the Internet: www.schmersal.net.
4.2 Connection example
Sensor with safety inputs and safety outputs in one pre-wired cable:
The series-wiring of multiple safety sensors is realised by wiring in the
control cabinet or in on-site junction boxes.
Colour
Connection example
BN
(brown)
A1 Ue
BU
(blue)
A2 GND
VT
(violet)
X1 Safety input 1
WH
(white)
X2 Safety input 2
BK
(black)
Y1 Safety output 1
RD
(red)
Y2 Safety output 2
GY
(grey)
Diagnostic output
BN
BU
RD
BK
WH
GY
VT
4.3 Series wiring
A 200 m long sensor chain can be set up. Please note that voltage
losses could occur (due to cable length, cable section, voltage drop/
sensor)! For longer cable lengths, the section of the connecting cables
must be taken as large as possible.
EN
EX-CSS 180
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