ISO 22555:2022 pdf – Ships and marine technology — Propeller pitch indicators

ISO 22555:2022 pdf – Ships and marine technology — Propeller pitch indicators.
1 Scope This document specifies the construction, performance requirements, methods of testing and required test results for the propeller pitch indicators (hereinafter referred to as “indicator system”) required by Clause 2.5.4, Regulation 19, chapter V, SOLAS 1974 (as amended, 2000). This document is associated with IMO Resolution A.694 (17) and IEC 60945. Where a requirement in this document differs from IEC 60945, the requirement in this document takes precedence. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60945, Marine navigation and radiocommunication equipment and systems — General requirements — Methods of testing and required test results 3? Terms? and? definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminology databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https:// www .iso .org/ obp — IEC Electropedia: available at https:// www .electropedia .org/ 3.1 propeller pitch indicator remote device capable of indicating the angular position of moving propeller blades between their maximum angular setting on either side of their neutral position on the equipment to which they are mounted
4 Construction of an indicator system 4.1 Indicator system a) An indicator system should show information on the state of the equipment or machinery to which it is connected at locations adjacent to or remote from the equipment or machinery. At the equipment or machinery, such systems generally comprise a sensor and transmitter; at the observer’s location, such systems generally contain an indicator. b) In general, the system construction shall comply with the following requirements: 1) the indicator system enclosures shall be robust and constructed so as to facilitate easy adjustment and maintenance; 2) the indicator system shall be provided with an earthing terminal or shall be so constructed as to be capable of being connected to an electrical earth; 3) an analogue-type indicator can be used as indicator(s) of the indicator system. It may be additionally provided by a digital type if fitted. If a display is used for presentation, the equipment shall comply with MSC.191 (79), as amended by MSC.466 (101), and with IEC 62288. 4.2 Transmitter The transmitter shall be driven by suitable means from the controllable pitch propeller activating mechanism. 4.3 Indicator a) An analogue-type indicator shall be of a centre-zero type (preferably circular). Where a circular scale indicator is used, the zero position shall be uppermost.
4.4 Alert If the equipment is capable of raising an alert, it shall comply with MSC.302 (87), IEC 62923-1 and IEC 62923-2. 5 Performance requirements 5.1 General The transmitter shall have the capacity to satisfy the requirements specified in 5.2, 5.3 and 5.4 when all connected indicators are operating simultaneously. The manufacturer shall clearly state the maximum number of indicator(s) or the capacity of connected indicator(s) that can be supported by a transmitter. 5.2 Calibration accuracy To calibrate the indicator system, the shaft of a transmitter is gradually rotated from the zero position to the maximum angle ahead (starboard) or astern (port), and the angles shown by an indicator are recorded every 5° of rotation. The difference between the angle of the transmitter shaft and the corresponding value shown at an indicator shall be within ±1,5 % of the sum of the maximum angle in both directions. 5.3? Damping? efficiency If a voltage is suddenly applied while the transmitter shaft is approximately at half of full-scale position and the indicator pointer is set to the zero position, the pointer shall be reset to that position within 5 s or less. 5.4? Power? supply? fluctuation a) The performance specified in 5.1 and 5.2 shall be maintained when the system is subjected to the power supply fluctuations. b) After repeated makings and breakings, the designated performance shall be demonstrated without carrying out manual adjustments. c) When the rated voltage and frequency are subjected to the combinations of fluctuations, as given in Table 1, the designated performance shall be demonstrated.