4
Operating instructions
Safety sensor
EX-BNS 33
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 specified wire
colours. If the safety sensor is equipped with an LED, the LED will be
illuminated when the guard is open.
Safety contacts:
S21-S22 and S11-S12 or S13-S14
oder C-S22 and C-S12 or C-S14
Signalling contact: S31-S32 or C-S32
4.2 Contact variants
The contact position shows the actuated sensor function when the
safety guard is closed.
1 NO contacts / 1 NC contacts 1 NO contacts / 2 NC contacts
EX-BNS 33-11Z-3G/D
EX-BNS 33-12Z-3G/D
BK 13
WH 21
14 BU
22 BN
BK 22
WH 32
14 BU
C BN
with LED
with LED
EX-BNS 33-11ZG-3G/D
EX-BNS 33-12ZG-3G/D
BK 13
WH 21
14 BU
22 BN
BK 22
WH 32
14 BU
C BN
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.
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 cable entry and connections in de-energised condition
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.
