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Informative Appendix
INFORMATIVE APPENDIX (questions and answers)
Below there are listed the most common questions, asked by technicians. For closer examination, please refer to the norm EN 12453.
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Briefly, what does the
EN 12453:2017
norm speak about?
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The EN 12453 norm “Industrial, commercial and garage doors and gates – Safety in use of powered operated doors – Requirements and test
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methods” describes in detail the risks related to safety of automatic gates and doors, and fixes the limits of crushing force, both in amplitude
(Newton) and in duration (seconds).
The EN 12453 norm describes also the tests to be carried out to verify the safety of various kind of automatic gates and doors, from sliding
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doors to barriers. Besides, it describes the technical data of the force measurement instrument, and underlines the need to have the
instrument periodically calibrated at least once a year.
What are the
responsibilities
of technician?
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From 1st May 2005, it is mandatory to carry out the CE marking on automatic doors and gates. The technician shall : 1) Compile the
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Technical Dossier, with force measurements reports enclosed; 2) Subscribe the CE Declaration to be delivered to customer; 3) Put, in
indelible manner, the CE mark on the automatic door.
Is it necessary to use
accessories
?
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During the use, instrument has to be holded up, in a way to not alter tests results. There are some easy measurements, in which the
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instrument can be used with the original handle; in other measurements, it is necessary to use proper extensions. For example, in barriers,
the extension must be fixed to ground, and must have the possibility to adjust height and tilt.
How the
resultant graph
is to be interpreted?
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The resultant test graph, rapresents the diagram of Force (amplitude expressed in Newton, on vertical ax) versus Time (duration expressed
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in seconds, on horizontal ax).
The interpretation of diagram in the BlueForce program is easy and immediate: what is more important is that the trend of the diagram must
be entirely contained into the coloured mask. However, to be able to make adjustments on the gate installed, it is very important to
understand the meaning of parameters measured. Let’s look at the force diagram: by convention there are three separated areas:
A)
IMPACT –“Dynamic period”: it shows the trend of the force during the
first instants of contact, and represents the energy released in the
initial impact, related to speed and mass of gate.
The parameters measured are:
Fd
: maximum peak value of force (N), based on the kind of gate and
position, it shall be less than 400N or 1400N.
Td
: duration of force peak (s) must be less than 0.75s.
B)
CRUSHING –“Static period”: it represents the force trend, after the
first impact. It represents the crushing force generated by motor, that
insists on pushing also after the impact.
The parameters measured are:
Fs
: it is the average value of static force, normally it must be less than
150N.
Fe
: it is the value of final force, measured after 5 seconds from the
first contact. Normally the force should decrease until reaching the
maximum level of 25N.
C)
END PHASE: after 5 seconds from the first contact, the residual force
must be always less or equal than 25N.