GB/T 24808-2022Electromagnetic compatibility for lifts, escalators and moving walks - Immunity (English PDF)

1.1 This document specifies the immunity performance criteria and test levels for

apparatus used in lifts, escalators and moving walks which are intended to be permanently installed in buildings including the basic safety requirements in regard to their electromagnetic environment. These levels represent essential EMC requirements.

This document refers to EM conditions as existing in residential, office and industrial buildings.

1.2 This document addresses commonly known EMC related hazards and hazardous

situations relevant to lifts, escalators and moving walks when they are used as intended and under the conditions foreseen by the manufacturers.

It is assumed that no ports connected to safety circuit only are rated at currents greater than 100 A.

It is assumed that mobile telephones and radio transmitters used at frequencies and power of that stated in Table 1 are not placed within 200 mm distance from safety circuit(s).

1.3 Performance criteria and test levels for apparatus/assembly of apparatus used in

general function circuits do not cover situations with an extremely low probability of occurrence.

This document does not apply to other apparatus already proven to be in conformity to the relevant EMC national standard, and not related to the safety of the lift, escalator or moving walk, such as lighting apparatus, communication apparatus, etc.

This document does not apply to electromagnetic environments such as radio transmitter stations, railways and metros, heavy industrial plant, and electricity power stations which need additional investigations.

This document is not applicable to apparatus which were manufactured before the date of its implementation.

4.2 Travelling cables or any other cables likely to be more than 5 m long shall be

represented by a sample of at least 5 m long connected to the relevant port for the purpose of testing for susceptibility.

4.3 It is not always possible to measure the immunity levels for every function of the

apparatus/assembly of apparatus. In such cases, the most critical period of operation shall be selected.

4.4 The test shall be carried out under a single set of environmental conditions within

the specified operating range of temperature, humidity, air pressure and supply voltage, unless otherwise indicated in the standards referred to in 4.1.

4.5 All tests shall be carried out in well-defined and reproducible conditions.

4.6 To facilitate testing, assemblies of apparatus may be tested together. However, where apparatus contain safety circuits, the tests shall prove that the safety circuits comply with the immunity requirements for all circuits and specific requirements for safety circuits.

This does not imply that those parts of the whole assembly, which are general function circuits, need to comply with the safety circuit requirements.

4.7 Tests shall be carried out at the following ports of the apparatus or assembly of

apparatus where they exist:

- enclosure port (see Table 1);

- ports for signal and control lines not crossing system boundaries (see Table 2);

- ports for monitoring and remote alarm systems crossing the system boundaries (see

Table 3);

- input and output D.C. power ports with current rating <=100 A (see Table 4);

- input and output D.C. power ports with current rating >100 A (see Table 5);

- input and output A.C. power ports with current rating at <=100 A per phase (see

Table 6);

- input and output A.C. power ports with current rating >100 A per phase (see Table 7).

Note: Current rating is the current for which the apparatus/assembly of apparatus has been designed for final application.

4.8 The configuration and mode of operation during measurement shall be recorded.

4.9 Test values shall be applied as specified in Table 1 to Table 7, and the performance

criteria shall be met as appropriate. The tests shall be carried out individually as single tests and in sequence.

4.10 CISPR 35:2016 shall be applied to wired network ports as defined in CISPR

32:2015+A1:2019.

5.1 The application of tests for evaluation of immunity depends on the type of

apparatus/assembly of apparatus, its configuration, ports, technology and operating conditions.

5.2 It can be determined from consideration of the electrical characteristics and usage

of a particular apparatus/assembly of apparatus that some of the tests are inappropriate or unnecessary. In such a case, the decision and justification not to test shall be recorded.

5.3 Where deviations from the test methods specified in 4.1 are applied, such deviations

shall be justified and recorded.

6.1 General

The special requirements of the product make it necessary to define precise criteria for the evaluation of the immunity test results.

The basic safety requirements of the system (lift, escalator or moving walk) are specified in local standards. For this reason, a performance criterion derived from the immunity levels of GB/T 17799.1-2017 is deemed sufficient for most functions.

However, for safety circuits, where any malfunction that can produce an unsafe operating mode cannot be tolerated, higher immunity levels derived from IEC 61000-6-2:2016 are stipulated.

If radio equipment is used in combined apparatus/assembly of apparatus, uncontrolled operation of a transmitter during testing is not allowed.

6.2 Performance criteria

A functional description of the apparatus or assembly of apparatus and a definition of performance criteria during, or as a consequence of, testing shall be recorded. The definition of performance criteria shall be based on:

Performance criterion A: The apparatus/assembly of apparatus shall continue to operate as intended. No degradation of performance or loss of function is allowed below a performance level specified by its manufacturer, when the apparatus or assembly of apparatus is used as intended. In some cases, the performance level may be replaced by a permissible loss of performance. If the minimum performance level or the permissible performance loss is not specified by the manufacturer, then either of these may be derived from the product description and documentation and what the user can reasonably expect from the apparatus or assembly of apparatus.

Performance criterion B: The apparatus/assembly of apparatus shall continue to operate as intended after the test. No degradation of performance or loss of function is allowed below a performance level specified by its manufacturer, when the apparatus or assembly of apparatus is used as intended. In some cases, the performance level may be replaced by a permissible loss of performance. However, during the test, degradation of performance is allowed. No change of actual operating state or stored data is allowed.

If the minimum performance level or the permissible performance loss is not specified by the manufacturer then either of these may be derived from the product description and documentation and what the user can reasonably expect from the apparatus or assembly of apparatus.

Performance criterion C: Temporary loss of function is permitted, provided the function is self-recoverable or can be restored by the operation of the controls.

Performance criterion D: The apparatus/assembly of apparatus and the associated safety component(s) shall continue to operate as intended. No degradation of performance or loss of function is allowed other than a failure into a safe mode.

6.3 Enclosure ports of safety circuits

Where a risk assessment demonstrates that the location of a safety circuit can allow a mobile telephone or emergency services radio transmitter to be placed directly beside the device, then the enclosure port of the device shall be implemented so that performance criterion D is satisfied in these conditions.