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6

Operating instructions

Safety light barriers

SLB440

SLB450

EN

3.5  Safety distance

The safety distance is the minimum distance between the protection 

field of the safety light barrier and the hazardous area The safety 

distance must be observed to ensure that the hazardous area cannot 

be reached before the hazardous movement has come to standstill

Calculation of the safety distance to EN ISO 13855 and EN ISO 13857

The safety distance depends on the following elements:

•  Stopping time of the machine (calculation by run-on time 

measurement)

•  Response time of the machine and the safety light barrier and the 

downstream safety-monitoring module (entire safety guard)

•   Approach  speed

Safety light barrier

The safety distance for the safety light barrier is calculated by means of 

the following formula:

S = (1600 mm/s x T)+ 1200 [mm]

S =  Safety distance [mm]

T =  Total reaction time (machine run-on time,  

reaction time of the safety guard, relays, etc)

To prevent the AOPD from reaching over or creeping under, the beam 

should be installed 750 mm above the ground or reference level  

(see ISO 13857)

If using safety light barriers, the following points must be observed:

•  Prevent the possibility of going under or over the beam

•  Prevent the possibility of reaching through between two beams

•  Prevent the possibility of climbing through between two beams

Safety distance to the hazardous area

S

Hazardous 

point

Transmitter

Receiver

Command device

Authorised operation

Mechanical protection

Direction from which the 

hazardous area is accessed

Please observe the applicable harmonised EN standards and possible 

applicable national regulations

The safety distance between the safety light barrier and the 

hazardous point must always be respected and observed If 

a person reaches the hazardous point before the hazardous 

movement has come to a standstill, he or she is exposed to 

serious injuries

The AOPD should be located parallel with the floor and the 

beam should be interrupted by the upright body of a person 

A single beam AOPD as the only guard system is not suitable 

for preventing the whole body of a person from accessing 

We recommend combining the AOPD with other protective 

equipment to make it impossible to pass by the guard system 

without being detected in the process

To calculate the minimum distances of the safety guards 

with regards to the hazardous point, the EN ISO 13855 and 

EN ISO 13857 must be observed

3.5.1 Minimum distance to reflecting surfaces

During the installation, the effects of reflecting surfaces must be taken 

into account In case of an incorrect installation, interruptions of the 

protection field could possibly not be detected, which could lead to 

serious injuries The hereafter-specified minimum distances with regard 

to reflecting surfaces (metal walls, floors, ceilings or parts) must be 

imperatively observed

a= 262 mm

Access direction

Receiver

Obstacle

Optical axis

Transmitter

Reflecting body

(eg Material container)

Limit of the  

hazardous point

a=130mm

Safety distance a

a [mm]

D [m]

0

3 5

10

100

200

300

400

500

600

700

800

900

1000

15

20

Calculate the minimum distance to reflecting surfaces as a function of 

the distance with an aperture angles of ± 2.5° degrees or use the value 

from the table below:

Distance between transmitter and receiver 

[m]

Minimum distance 

a [mm]

02 … 30 

130

4

175

5

220

7

310

10

440

12

530

Formula: a = tan 2.5° x L [mm]

a = Minimum distance to reflecting surfaces

L = Distance between transmitter and receiver

Summary of Contents for SLB440

Page 1: ...d lead to physical injury and or damage to the machine Content 1 About this document 1 1 Function 1 1 2 Target group authorised qualified personnel 1 1 3 Explanation of the symbols used 1 1 4 Appropri...

Page 2: ...ents cannot be excluded when safety device is used The relevant requirements of the standards EN ISO 13855 EN ISO 13857 must be observed Only if the information described in this operating instruction...

Page 3: ...ailure OSSD leakage current The downstream control element must recognise this state as LOW A safety PLC must detect this state 4 The load inductivity generates an induced voltage during the switch of...

Page 4: ...e released as soon as the indicator of the receiver changes from red to yellow and the indicator of the transmitter changes from blue to yellow The AOPD is now in setup mode The signal strength is dis...

Page 5: ...light impulses The better the alignment the higher the frequency of the light pulses The alignment is optimal when the light pulses switch over to continuous light If there is no optical synchronisati...

Page 6: ...fety distance between the safety light barrier and the hazardous point must always be respected and observed If a person reaches the hazardous point before the hazardous movement has come to a standst...

Page 7: ...at risk if systems are operated with reciprocal interference The response time of the system changes with the selected beam coding The safety distance must be adapted accordingly See section on reacti...

Page 8: ...5 m For use in the operating mode Restart Interlock manual reset Adapter cable for parameter setting Item No Designation Description Length 103013625 KA 0977 Pushbutton with command device 1x male con...

Page 9: ...e 1 BK Range 2 WH OSSD 2 BK 0 VDC BU 24 VDC BN Release restart GY 24 VDC BN 0 VDC BU OSSD 1 WH Earth connection S 1 K1 K2 5 1 3 2 4 E1 2 4 1 3 Protective mode Automatic active Delivery state Command d...

Page 10: ...d The operating principle of the AOPD and the machine must be known in order to be able to conduct an inspection If the fitter the planning technician and the operator are different persons please mak...

Page 11: ...ver the indicator is delayed until there is no change in the ON state or OFF state of the OSSDs for 5 seconds Only SLB450 transmitter If the transmitter is configured for alternative range an addition...

Page 12: ...n of the technical documentation Oliver Wacker M ddinghofe 30 42279 Wuppertal K A Schmersal GmbH Co KG M ddinghofe 30 D 42279 Wuppertal Postfach 24 02 63 D 42232 Wuppertal Phone 49 0 2 02 64 74 0 Tele...

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