AS 5236.1:2021 – Cranes-Limiting and indicating devices Part 1: General (Iso 10245-1:2008,MOD).
slewing limiter
device used to prevent stewing beyond specified limits
telescoping limiter
device used to prevent the extension or retraction of a member beyond specified limits
travelling and traversing limiter
device used to prevent all types of movement along rail tracks or runways beyond specified limits
working space limiter
device used to prevent a fixed load-lifting attachment and/or parts of the crane from entering a prohibited space
Note ito entry: Working space limitation is often achieved by a combination oldiffercnt limiters.
4 Safety requirements and/or measures
4.1 Limiters and indicators
4.1.1 The crane manufacturer shall select a device having a specification that is compatible with the designed use of the crane, taking the following into account:
a) the operating environment, e.g. relative humidity, freezing, condensation;
b) the rated capacity;
c) crane characteristics;
d) electromagnetic compatibility.
4.1.2 The installation of liniiters and indicators shall be carried out in a manner that does not reduce
the required strength of the crane.
4.1.3 The effects (e.g. forces, stopping distances) resulting from the operation of the limiter shall be within the design constraints of the crane.
4.1.4 Systems shall enable periodic functional checks to be carried out to verify that Indicators are operating correctly.
4.1.5 If interruption of the power occurs, the setting of limiters and indicators shall he retained.
4.1.6 Devices shall be capable of withstanding the shock loads and vibrations transmitted to them during normal usage, erection, rope changing, dismantling and maintenance of the crane.
4.L7 Painting or other corrosion protection shall not affect the correct functioning of limiters and indicators.
4.2 General requirements for rated capacity limiters and indicators
4.2.1 Rated capacity limiters and indicators shall be provided on all cranes having a rated capacity of 3 t and above. It is. however, recommended for cranes of 1 t and above, or an overturning moment of 40OOO m and above.
NOTE For rope or chain hoists for which the rated capacity does not vary with the position of the load, the risk assessment can show that the rated capacity Indicator Is not necessary.
4.2.2 The rated capacity limiter/indicator shall perform in accordance with the requirements of this part of ISO 10245 for all rated capacities and all configurations described in the operating manual supplied by the manufacturer.
4.2.3 II a crane can be operated with different configurations, there shall be an indication of the crane configuration for which the rated capacity limiter/indicator has been set. Where a configuration selecting device is provided, a direct description of the configuration selected shall be provided on the device, or a code which can be checked against a separate list of codes/configurations.
4.2.4 Rated capacity limiters and Indicators shall operate automatically for all configurations and positions of the crane.
4.2.5 Features shall be incorporated to minimize the risk of accidental change of any manual setting device (e.g. by locking or double action).
4.2.6 The number of setting positions of the configuration selection device(s) shall relate to the number of configurations provided [or the crane. Positions which are not utilized shall render the crane inoperative or not cause an unsafe crane condition if selected.
4.2.7 The design and installation of rated capacity indicators and rated capacity limiters shall take into account the need to test the crane with overloads, without dismantling or permanently affecting the performance of the indicator or limiter. Where It Is necessary to disconnect parts of the devices during testing, facilities shall be provided to check and/or reset the devices after the test.
4.3 Rated capacity limiters
4.3.1 General The rated capacity limiter shall prevent the crane From operating outside the limits of the positions and loads shown and/or described on the rated capacity chart. The rated capacity limit setting. QL, shall meet the limitations specified in Equation (I).