4
Operating instructions
Safety sensor
EX-BNS40S
EN
3.3 Axial misalignment
A horizontal and vertical misalignment of the safety sensor and
the actuator is tolerated. The possible misalignment depends on
the distance of the active surface of the sensor and the actuator.
The sensor remains active within the tolerance range.
The specified switching distances refer to opposedly mounted
safety sensors and actuators.
0
2
4
6
8
5
7
5
6
5
5
4
4
2
2
BPS40S-1-C
0
2
4
6
8
5
7
5
6
5
5
4
4
2
2
BPS40S-2-C
Assured switching distance: s
ao
= 8 mm
Assured switch-off distance: s
ar
= 18 mm
3.4 Adjustment
Align the central markings of the safety sensor and the actuator
with each other. The LED can only be used as rough setting tool.
The correct functionality of both safety channels must be checked
by means of the connected safety-monitoring module.
4. 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 safety sensors must be wired in accordance with the specified wire
colours.
On the basis of the maximum switching voltage 24 VAC/DC,
the safety sensor has a double or reinforced insulation in
accordance with EN 60079-0 (paragraph 15.2, devices that
do not require an earth connection).
4.2 Contact variants
The contact position shows the actuated sensor function when the
safety guard is closed. For safety sensors with LED, the LED is
illuminated when the safety guard is closed. The contact configurations
of the versions with or without LED are identical.
S14 PK
GN S21
GY S13
WH S31
S22 YE
S32 BN
4.3 Connection
The safety sensor is suitable for use in conjunction with safety-
monitoring modules, which are controlled through NO/NC safety inputs
or NC/NC safety inputs.
In these versions, the optional LED is integrated in the S21-S22 circuit.
Connection to safety-monitoring modules with NO/NC inputs:
NO
contacts:
S13 - S14 to the NO input of
the safety-monitoring module
(AES safety-monitoring module:
terminal S13 – S14)
NC
contacts:
S21 - S22 at the NC input S21 - S22
of the safety-monitoring module
(AES safety-monitoring module:
terminal S21 - S22)
NC
contacts:
S31 - S32 can be used as signalling contact
Connection to safety-monitoring modules with NC/NC inputs:
NC
contacts:
S21 - S22 at the 1st NC input
safety-monitoring module
(AES safety-monitoring module:
terminal S11 - S12)
NC
contacts:
S31 - S32 at the 2st NC input
safety-monitoring module
(AES safety-monitoring module:
terminal S21 - S22)
NO
contacts:
S13 - S14 can be used as signalling contact
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.
