Safety rules for the construction and installation of lifts

BS EN 81-50:2020 pdf free.Safety rules for the construction and installation of lifts一Examinations and tests Part 50: Design rules, calculations, examinations and tests of lift components.
These procedures are applicable to locking devices for landing and car doors. It is understood that each component taking part in the locking of doors and in the checking of the locking forms part of the locking device.
5.2.1.2 Documents to be submitted
5.2.1.2.1 Schematic arrangement drawing with description of operation
This drawing shall show clearly all the details relating to the operation and the safety of the locking device, including:
a) the operation of the device in normal service showing the effective engagement of the locking elements and the point at which the electrical safety device operates;
b) the operation of the device for mechanical checking of the locking position if this device exists;
c) the control and operation of the emergency unlocking device;
d) the type (AC and/or DC) and the rated voltage and rated current.
5.2.1.2.2 Assembly drawing with key
This drawing shall show all parts, which are important to the operation of the locking device, in particular those required to conform to requirements of this standard. A key shall indicate the list of principal parts, the type of materials used, and the characteristics of the fixing elements.
5.2.1.3 Test samples
One door locking device shall be submitted to the laboratory.
If the test is carried out on a prototype, it shall be repeated later on a production model.
If the test of the locking device is only possible when the device is mounted in the corresponding door the device shall be mounted on a complete door in working order. However, the door dimensions may be reduced by comparison with a production model, on condition that this does not falsify the test results.
5.2.2 ExamInation and tests
5.2.2.1 Examination of operation
This examination has the aim of verifying that the mechanical and electrical components of the locking device are operating correctly with respect to safety, and in conformity with the requirements ol this standard, and the standard calling for this locking device and that the device is in conformity with the particulars provided in the application.
In particular it shall be verified that:
a] there is at least 7 mm engagement of the locking elements before the electric safety device operates;
b] it is not possible from positions normally accessible to persons to operate the lift with a door open or unlocked, after one single action, not forming part of the normal operation.
These tests have the purpose of verifing the strength of the mechanical locking components and the electrical components.
The sample of the locking device in its normal operating position is controlled by the devices normally used to operate it.
The sample shall be lubricated in accordance with the requirements of the manufacturer of the locking device.
When there are several possible means of control and positions of operation, the endurance test shall be made in the arrangement which is regarded as the most unfavourable from the point of view of the forces on the components.
The number of complete cycles of operation and the travel of the locking components shall be registered by mechanical or electrical counters.
5.2.2.2.2 Endurance test
The locking device shall be submitted to 1 000 000 (±1 %) complete cycles; one cycle comprises one
forward and return movement over the full travel possible in both directions.
The driving of the device shall be smooth, without shocks, and at a rate of 60 (±10 %) cycles per minute.
During the endurance test the electrical contact of the lock shall close a resistive circuit under the rated voltage and at a current value double that of the rated current.
lithe locking device is provided with a mechanical checking device for the locking pin or the position of the locking element, this device shall be submitted to an endurance test of 100 000 (±1 %) cycles.
The driving of the device shall be smooth, without shocks, and at a rate of 60 (±10 %) cycles per minute. 5.2.2.2.3 Static test
For locking devices intended for hinged doors, a test shall be made consisting of the application over a total period of 300 s of a static force increasing progressively to a value of 3000 N.
This force shall be applied in the opening direction of the door and in a position corresponding as far as possible to that which may be applied when a user attempts to open the door. The force applied shall be 1 000 N in the case of a locking device intended for sliding doors.
5.2.2.2.4 Dynamic test
The locking device, in the locked position, shall be submitted to a shock test in the opening direction of the door.
The shock shall correspond to the impact of a rigid mass of 4 kg falling in free fall from a height of 0,50 m.
5.2.2.3 Criteria for the mechanical tests
After the endurance test (5.2.2.2.2), the static test (5.2.2.2.3) and the dynamic test (5.2.2.2.4) there shall not be any wear, deformation or breakage, which could adversely affect safety.
5.2.2.4 Electrical test
5.2.2.4.1 Endurance test of contacts
This test is included in the endurance test laid down in 5.2.2.2.2.
5.2.2.4.2 Test of ability to break circuit
5.2.2.4.2.1 General
This test shall be carried out after the endurance test. It shall check that the ability to break a live circuit is sufficient. This test shall be made in accordance with the procedure in EN 60947-4-1:2010 and EN 60947-5-1:2017, the values of current and rated voltage serving as a basis for the tests shall be those indicated by the manufacturer of the device,
If there is nothing specified, the rated values shall be as follows:
a) Alternating current: 230 V. 2 A;
b) Direct current: 200 V. 2 A.
In the absence of an indication to the contrary, the capacity to break circuit shall be examined for both AC and DC conditions.
The tests shall be carried out with the locking device in the working position. If several positions are possible, the test shall be made in the most unfavourable position.
The sample tested shall be provided with covers and electric wiring as used in normal service.
5.2.2.4.2.2 AC locking devices shall open and close an electric circuit under a voltage equal to 110 % of the rated voltage 50 times, at normal speed, and at intervals of 5 s to 10 s. The contact shall remain closed for at least 0,5 s.
The circuit shall comprise a choke and a resistance in series. Its power factor shall be 0,7 0.05 and the test current shall be 11 times the rated current indicated by the manufacturer of the device.
5.2.2.4.2.3 DC locking devices shall open and close an electric circuit under a voltage equal to 110 % of the rated voltage 20 times, at normal speed, and at intervals of 5 s to 10 s. The contact shall remain closed for at least 0,5 s.
The circuit shall comprise a choke and a resistance in series having values such that the current reaches 95 % of the steady-state value of the test current in 300 ms.
The test current shall be 110 % of the rated current indicated by the manufacturer of the device.
5.2.2.4.2.4 The tests are considered as satisfactory if no tracking or arcing is produced and if no deterioration occurs which could adversely affect safety.
5.2.2.4.3 Test for resistance to leakage currents
This test shall be made in accordance with the procedure in EN 60112:2003. The electrodes shall be connected to a source providing an AC voltage which is sinusoidal at 175 V, 50 Hz.BS EN 81-50 pdf free download.Safety rules for the construction and installation of lifts