BS EN 81-50:2020 pdf free download – Safety rules for the construction and installation of lifts一Examinations and tests Part 50: Design rules, calculations, examinations and tests of lift components.
5.6 Type examination of safety circuits containing electronic components and/or
programmable electronic systems (PESSRAL)
5.6.1 General provisions
5.6.1.1 General
For safety circuits containing electronic components, laboratory tests are necessary because practical checks on site, by inspectors, are impossible.
In the following, mention is made to printed circuit board. If a safety circuit is not assembled in such a manner, then the equivalent assembly shall be assumed.
5.6.1.2 Safety circuits containing electronic components
The applicant shall indicate to the laboratory:
a) identification on the board;
b) environmental working conditions;
c) listing of used components;
d) layout of the printed circuit board;
e) layout of the hybrids and marks of the tracks used in safety circuits;
O function description;
g) electrical wiring diagram, including input and output definitions of the board;
h) the method of failure analysis employed and the documented results.
5.6.1.3 Safety circuits based on programmable electronic systems
In addition to 5.6.1.1 the following documentation shall be provided:
a) documents and descriptions relating to the measures listed in Annex B;
b) general description of the software used (e.g. programming rules, language, compiler, modules);
c) function description including software architecture and hardware/software interaction;
d) description of blocks, modules, data, variables and interfaces;
e) software listings.
5.6.2 Test samples
There shall be submitted to the laboratory:
a) one printed circuit board;
b) one printed circuit board bare (without components).
5.6.3 Tests
5.6.3.1 Mechanical tests
5.6.3.1.1 General
During the tests, the tested object (printed circuit) shall be kept under operation. During and after the tests, no unsafe operation and condition shall appear within the safety circuit.
5.6.3.1.2 Vibration
Transmitter elements of safety circuits shall withstand the requirements of:
a) EN 60068-2-6:2008, Endurance by sweeping: Table C.2:
20 sweep cycles in each axis, at amplitude 0,35 mm, and in the frequency range 10-55 Hz; and also to:
b) EN 60068-2-27:2009, Acceleration and duration of pulse: Table 1:
the combination of:
— peak acceleration 294 rn/s2 or 30 gn;
— corresponding duration of pulse 11 rns; and
— corresponding velocity change 2,1 rn/s half sine.
NOTE Where shock absorbers for transmitter elements are fitted, they are considered as part of the transmitter elements.
After tests, clearances and creepage distances shall not become smaller than the minimum accepted.
5.6.3.1.3 Bumping (EN 60068-2-27:2009)
5.6.3.1.3.1 General.
5.6.3.2 Temperature tests (EN 60068-2-14:2009)
Operating ambient limits: 0 °C, + 65 °C (the ambient temperature is of the safety device).
Test conditions:
-the printed circuit board shall be in operational position;
-the printed circuit board shall be supplied with rated operational voltage;
-the safety device shall operate during, and after the test. If the printed circuits board includes components other than safety circuits, they also shall operate during the test (their failure is not considered);
tests shall be carried out for minimum and maximum temperature [0 °C + 65 °C]. Tests shall last a minimum of four hours; if the printed circuit board is designed to operate within wider temperature limits, it shall be tested for these values.