4
Operating instructions
Safety sensor
EX-BNS 33-…-2187
EN
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 wire colours
or the pin configuration.
4.2 Contact variants
The contact position shows the actuated sensor function when the
safety guard is closed. If the safety sensor is equipped with a LED,
the LED will be illuminated when the guard is open.
Safety contacts:
02Z: S11-S12 and S21-S22
12Z: S21-S22 and S31-S32
Signalling contact:
12Z: S13-S14
EX-BNS 33-12Z(G)-2187-3G/D
EX-BNS 33-02Z(G)-2187-3G/D
GY 13
GN 21
WH 31
14 PK
22 YE
32 BN
BK 11
WH 21
12 BU
22 BN
4.3 Connection
For safety-monitoring modules with two NC inputs, the wires of the
EX-BNS 33-12Z-2187-3G/D safety sensor must be wired as follows:
NC contacts:
WH (21) und BN (22)
at the "NC input" of the
safety-monitoring module
NC contacts:
GN (31) und YE (32)
at the "NC input" of the
safety-monitoring module
NO contacts:
GY (13) und PK (14)
can be used for
signalling purposes.
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.
Connecting multiple safety sensors to one suitable safety-monitoring
module is technically possible. To connect multiple safety sensors
(check if authorised!), their NO contacts are wired in parallel and their
NC contacts in series. The Protect-IE-11 or PROTECT-PE-11 (-AN)
input expander module can be used to connect up to 4 safety sensors
with NC/NO contacts.
When connecting the EX-BNS-33-12Z-2187-3G/D safety sensors to the
AES 1102/1112/7112 safety-monitoring module, the connecting cables
of the S14/S22/S32 of the EX-BNS must be wired to the terminals with
the same label of the AES. The S13/S21/S31 connecting cables must
be wired together to the C terminal of the AES (refer to AES operating
instructions manual).
Connecting more than two magnetic safety sensors EX-BNS
33-12Z-2187-3G/D to the safety monitoring modules AES
1102/1112/7112 is not possible.
If safety sensors with LED's are used, the light intensity of the LED's
will decrease as the number of open safety guards increases. Safety
sensors equipped with LED's shall not be wired in series, except for
the Protect-IE input expander module. As a result of this, the luminosity
of the LED's would considerably decrease and the voltage could drop
below the minimum input voltage of the downstream safety-monitoring
module.
In case of series-wiring at SRB max. 1 sensor with LED indication for U
N
.
Inductive loads (e.g. contactors, relays, etc.) are to be suppressed
by means of a suitable circuit. If the EX-BNS 33 with LED is used in
conjunction with an inappropriate AES safety-monitoring module, the
energy restriction for LED versions (24 V/10 mA) must be ensured by
the user.
5. Set-up and maintenance
5.1 Functional testing
The safety function of the safety components must be tested.
The following conditions must be previously checked and met:
1. The installation is executed according to the instructions
2. The connection is executed correctly
3. The safety component is not damaged
4. The system is free of dirt and soiling (in particular metal chips)
5. Check cable entry and connections in a de-energised condition
5.2 Maintenance
In the case of correct installation and adequate use, the safety sensor
features maintenance-free functionality. A regular visual inspection and
functional test, including the following steps, is recommended:
• Check the fitting of the sensor and the actuator
• Remove possible metal chips
• Check the cable for damage.
Adequate measures must be taken to ensure protection
against tampering either to prevent tampering of the safety
guard, for instance by means of replacement actuators.
Damaged or defective components must be replaced.
6. Disassembly and disposal
6.1 Disassembly
The safety switchgear must be disassembled in a de-energised
condition only.
6.2 Disposal
The safety switchgear must be disposed of in an appropriate manner
in accordance with the national prescriptions and legislations.