IEC 60571 pdf download.Railway applications – Electronic equipment used on rolling stock
1 Scope
This International Standard applies to all electronic equipment for control, regulation, protection, supply, etc., installed on rail vehicles and associated with: – either the accumulator battery of the vehicle; – or a low voltage power supply source with or without a direct connection to the contact system (transformer, potentiometer device, auxiliary supply); with the exception of electronic power circuits, which conform to IEC 61 287-1 . This standard covers the conditions of operation, design, construction, and testing of electronic equipment, as well as basic hardware and software requirements considered necessary for competent, reliable equipment. Additional requirements in other standards or individual specifications may complement this standard, if they are justified. Specific requirements related to practices necessary to ensure defined levels of functional safety are determined in accordance with 4.6.3.1 and 4.6.3.2 of IEC 62278 and its informative Annex A. Software safety integrity level of 1 or higher shall only be considered when it is shown that a residual safety risk remains and that it has to be carried by the software driven programmable electronic system. In such a case (i.e. software safety integrity level 1 or higher), IEC 62279 is applicable. For the purpose of this standard, electronic equipment is defined as equipment mainly composed of semiconductor devices and recognized associated components. These components will mainly be mounted on printed boards. NOTE Sensors (current, voltage, speed, etc.) and firing unit printed board assemblies for power electronic devices are covered by this standard. Complete firing units are covered by IEC 61 287-1 .
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply: 3.1 printed board base material cut to size containing all holes and bearing at least one conductive pattern. Printed boards are typically subdivided according to: – their structure (e.g. single and double-sided, multilayers) – the nature of the base material (e.g. rigid, flexible) 3.2 printed board assembly printed board with electrical and mechanical components and/or other printed boards attached to it with all manufacturing processes, soldering, coating, etc., completed 3.3 plug-in unit unit which plugs into a subrack and is supported by guides. These units can be of various types, ranging from a printed board with components mounted in a frame or box type unit, designed with a plug-in connection 3.4 subrack structural unit for housing printed board assemblies and/or plug-in units 3.5 rack free-standing or fixed structure for supporting electrical or electronic equipment (e.g. subracks) 3.6 cubicle any enclosure for housing electrical and/or electronic equipment 3.7 line replaceable unit unit designed to be exchanged as a result of on-vehicle fault diagnosis, e.g. a subrack, or plug-in unit 3.8 performance check short form performance test which is carried out during and after environmental tests, sufficient to prove that the equipment is within its operational limits, and that it has survived an environmental test 3.9 control system voltage supply voltage supply used to power the vehicle control equipment Note 1 to entry: The supply may be derived from a vehicle battery. The battery may be charged from battery chargers, auxiliary inverters and motor-alternator or motor-generator sets with associated electronic regulations. Where the control system voltage supply is derived from a battery, the nominal and rated control system voltages are defined in 5.1 . Where no battery is fitted, the nominal control system voltage is the normal controlled level of that voltage.3.10 vehicle wiring all wiring which can be connected to the control system voltage supply, wherever located, and all other wiring external to the electronic equipment under consideration 3.11 supply overvoltage electrical disturbance to the control system voltage supply caused by equipment controlling that supply. A supply overvoltage will occur as an increase in the level of the control system voltage supply. 3.12 surge non-periodic and relatively short positive or negative (or both) variable (voltage or current) between two steady states Note 1 to entry: It may be produced by the normal operation of equipment within the vehicle, caused generally by the discharge of energy when inductive circuits are switched. It may be present either on the control system voltage supply, or on wiring connected directly to switched inductive circuits, or coupled electrostatically or electromagnetically from such wiring into other wiring. The effective value of the source impedance of a transient will depend upon the manner of its generation and coupling. 3.13 burst repetitive pulses occurring during a fixed time interval They may occur during normal operation of the vehicle, typically resulting from unstable arc conditions
IEC 60571 pdf download
