schmersal BNS 180 Series Operating Instructions Manual Download Page 4

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.

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