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UNAC Guide No. 2- July 2005
MD
Ann. 1
Type of risks
Evaluation criteria and solutions to be adopted
(Tick the box corresponding to the solution adopted)
1.3.7
1.3.8
1.4
Mechanical risks caused by the movement of the gate (see references in Figure 1).
F
CAUTION – If the door/gate is used solely with hold-to-run controls (and meets the requirements of the
standard EN 12453), the danger points listed below do not have to be protected.
F
CAUTION – If protective devices are installed (in accordance with the standard EN 12978) which prevent in
all cases contact between the moving leaf and persons (for example photoelectric barriers, presence sensing
devices), it is not necessary to measure the operating forces.
[3] Impact and crushing on the main closing
edge (Figure 1, risk A).
F
Measure the closure forces (by means of the
special instrument required by the standard EN
12445) as illustrated.
In the case of gates with two leaves, the closure
force should be measured one leaf at a time.
Check that the values measured by the instrument
are below those indicated in the graph.
Carry out the measurements in the following points:
L = 50, 300 and 500 mm;
H = 50 mm,
at mid-height of the leaf and
at the height of the leaf minus 300 mm (max
2500).
N.B. The measurement should be repeated three
times in each point and the average value
considered.
The graph indicates the maximum values of the
dynamic, static and residual operating forces in
relation to the various positions of the leaf.
N. B. With reference to the measurement points with
L = 50, 300 and 500 mm, the maximum dynamic
force value permitted is 400 N.
F
If the values of the forces are higher, install a
protective device in accordance with the standard
EN 12978 (for example a sensitive edge) and repeat
the measurement.
N. B. The dynamic force can be reduced, for
example, by reducing the speed of the leaf or using
a sensitive edge with high elastic deformation.
Leaves with overlapping and delayed closure
Leaves with simultaneous closure
Force
Dynamic force
IMPACT
Static force
CRUSHING
time
Protective Device
Protective Device
