User Manual

SAFETY
Safety handbook page - 36 -
PNSPO
7.2.2 Type 2
The norm EN 61496-2 requires a self-testing function for type 2 AOPDs.
• In case of a faulty condition the systems will detect this condition after the next test
cycle
•
The internal test cycle must be obtained in an appropriate time ( max. 150ms),
depending on the safety requirement
• The effective aperture angle is specified to ± 5° from the beam-centre line.
•
The safety level of Type 2 is equal to category 2 (EN954-1).
7.3 Body protection devices
Multiple separate beams are often used to detect
intrusion of the whole body rather than parts of the body.
During risk assessment bypassing of the sensor such as
• crawling below the lowest beam
• reaching over the top beam
• reaching between two of the beams and
• bodily access by passing between two beams
have to been taken into account.
The heights for 2, 3 or 4 beams given in the table below
have been found to be the most practical in application.
Clause 6.1.4 of EN 999 specifies this heights and distances. The appropriate number
of beams has to be analysed and decided by risk assessment.
No. of beams Heights above floor in mm
2 400, 900
3 300, 700, 1100
4 300, 600, 900, 1200
Note: Only 0ne beam is not sufficient for safety applications
Faulty condition
T T T T T
Risk
Normal operation
Protection
field
External
Testcycle
OSSD/FSD
On
Off
free
broken