
4
Operating instructions
Safety sensor
BNS 180
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.
Inductive loads (e.g. contactors, relays, etc.) are to be provided with
suitable interference suppression circuitry.
4.2 Contact variants
The contact position shows the actuated sensor function when the
safety guard is closed.
BNS 180-11Z
BK 13
WH 21
14 BU
22 BN
BNS 180-12Z
BK 22
WH 32
14 BU
C BN
BNS 180-12Z-2187-2
GY 13
GN 21
WH 31
14 PK
22 YE
32 BN
BNS 180-02Z
BK 11
WH 21
12 BU
22 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 -02 or PROTECT-PE-11 (-AN) input expander mod-
ule can be used to connect up to 4 safety sensors with NC/NC or
NC/NO contacts.
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. Fitting of the sensor and the actuator
2. Fitting and integrity of the power cable
3. The system is free of dirt and soiling
(in particular metal chips)
5.2 Maintenance
A regular visual inspection and functional test, including the following
steps, is recommended:
• Check the fitting of the sensor and the actuator
• Remove possible iron 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.