Mounting of the Safety System
12
TNT 35 und TNT 35/7-24V
Leuze electronic
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NGLISH
FRANÇAIS
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EDERLANDS
3
Mounting of the Safety System
Note!
The mounting instructions in this chapter have to be heeded for fault-free functioning of the
whole safety system.
3.1
Mounting of the Protective Photoelectric Sensor
It is absolutely mandatory that the valid guidelines and standards are observed when
mounting the protective photoelectric sensors.
Safety distance
A certain time delay applies between the interruption of the light beam of the protective
photoelectric sensors and the stand-still of the machine. The photoelectric sensors have to
be installed in such a way that the dangerous area cannot be reached within this time
delay. The minimum distance for safeguarding the hazardous area is 850 mm.
Calculation of the safety distance
The safety distance S between photoelectric sensor and hazardous area is calculated acc.
to IS0 13855 using the following formula:
Example for the calculation of the safety distance:
A machine with a system response time of 100 ms has to be equipped with a two-beam
safeguarding. The response time of the two-beam AOPD and the test monitoring unit
TNT 35 is 20 ms.
Figure 3.1-1:
Safety distance S between photoelectric sensor and hazardous area
S = K * T+C
S = Safety distance between photoelectric sensor and hazardous area
K = Grip and approach speed
T = Time delay between interruption of the light beam and stand-still of the machine
C = Safety constant
1200 mm for single-axle arrangement,
850 mm for multi-axle arrangement
