AS ISO 14990.2:2022 pdf – Earth-moving machinery — Electrical safety of machines utilizing electric drives and related components and systems Part 2: Particular requirements for externally-powered machines

AS ISO 14990.2:2022 pdf – Earth-moving machinery — Electrical safety of machines utilizing electric drives and related components and systems Part 2: Particular requirements for externally-powered machines.
1  Scope This document specifies the particular safety requirements for the electrical equipment and its components incorporated in externally-powered (mains-connected, including machines powered by external dedicated generators), electrically-driven earth-moving machines (EMMs). It is applicable to those machines using on-board voltages in the range of 50 V–36 kV AC r.m.s. at any frequency and 75 V–36 kV DC — including any repetition rate of pulsating DC — intended for outdoor use. Voltages occurring within devices are not considered to be on-board voltages and are thus not within its scope. It is intended to be used in conjunction with ISO 14990-1, which gives general requirements for EMMs regardless of how they are powered. Requirements specific to self-powered machines are given in ISO 14990-3. However, it is possible for an EMM to be both self-powered and externally-powered (e.g. a battery-powered machine having a built-in charger with power supply function), in which case ISO 14990-3 is also applicable. 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. ISO 14990-1:2016, Earth-moving machinery — Electrical safety of machines utilizing electric drives or related components and systems — Part 1: General requirements ISO 14990-3, Earth-moving machinery — Electrical safety of machines utilizing electric drives or related components and systems — Part 3: Particular requirements for self-powered machines IEC 60071-1:2006, Insulation Coordination — Part 1: Definitions, principles and rules. Amended by IEC 60071-1:2006/Amd. 1:2010 IEC 60364-5-52, Low-voltage electrical installations — Part 5-52: Selection and erection of electrical equipment — Wiring systems
4  General requirements 4.1  General The requirements of ISO 14990-1:2016, Clause 4, shall apply except as modified by this clause. 4.2  Special conditions The enquiry form given in Annex A can be used as the basis for an agreement between user and supplier to address special conditions, or where certain provisions of this document might not be applicable. The waiver of any requirement shall be limited to situations not covered by this document. 4.3  Supplies 4.3.1  AC supplies Voltage: Steady-state voltage: 0,9 to 1,1 of nominal voltage. Frequency: 0,99 to 1,01 of nominal frequency continuously; 0,98 to 1,02 short time. Harmonics: Harmonic distortion not exceeding 10 % of the total r.m.s. voltage between live conductors for the sum of the 2nd to the 5th harmonic. An additional 2 % of the total r.m.s. voltage between live conductors for the sum of the 6th to the 30th harmonic is permissible. Voltage unbalance: Neither the voltage of the negative sequence component nor the voltage of the zero sequence component in three-phase supplies exceeding 2 % of the positive sequence component. Voltage interruption: Supply interrupted or at zero voltage for not more than 3 ms at any random time in the supply cycle with more than 1 s between successive interruptions. Voltage dips: Voltage dips not exceeding 20 % of the peak voltage of the supply for more than one cycle with more than 1 s between successive dips. 4.3.2  DC supplies 4.3.2.1  From batteries Voltage: 0,85 to 1,15 of nominal voltage; 0,7 to 1,2 of nominal voltage in the case of battery- operated vehicles. Voltage interruption: Not exceeding 5 ms. 4.3.2.2  From converting equipment Voltage: 0,9 to 1,1 of nominal voltage. Voltage interruption: Not exceeding 20 ms with more than 1 s between successive interruptions. NOTE  This is a variation on IEC Guide 106 for ensuring the proper operation of electronic equipment. Ripple (peak-to-peak): Not exceeding 0,15 of nominal voltage.
9.3  Socket outlets Overcurrent protection shall be provided in the unearthed live conductors of each circuit feeding general-purpose socket outlets intended primarily for supplying power to maintenance equipment. 9.4  Protection against supply interruption or voltage reduction and subsequent restoration Where a supply interruption or a voltage reduction can cause a hazardous situation, damage to the machine, or to the work in progress, undervoltage protection shall be provided by, for example, shutting down the machine at a predetermined voltage level. Where the operation of the machine can allow for an interruption or a reduction of the voltage for a short time period, delayed undervoltage protection may be provided. The operation of the undervoltage device shall not impair the operation of any stopping control of the machine. Upon restoration of the voltage or upon switching on the incoming supply, automatic or unexpected restarting of the machine shall be prevented where such a restart can cause a hazardous situation. Where only a part of the machine or of the group of machines working together in a coordinated manner is affected by the voltage reduction or supply interruption, the undervoltage protection shall initiate appropriate control responses to ensure coordination.