BS EN 16603-20-21:2020 pdf free.Space engineering — Interface requirements for electrical actuators.
BS EN 16603-20-21 In general terms, the scope of the consolidation of the electrical interface requirements for electrical (hold down and release or deployment) actuators in the present ECSS-E-ST-20-21 and the relevant explanation in the handbook ECSS-E-HB-20-21 is to allow a more recurrent approach both for actuator electronics (power source) and electrical actuators (power load) offered by the relevant manufacturers, at the benefit of the system integrators and of the Agency, thus ensuring: better quality,  stability of performances, and independence of the products from specific mission targets. A recurrent approach enables manufacturing companies to concentrate on products and a small step improvement approach that is the basis of a high quality industrial output.The following normative documents contain provisions which, through reference in this text, constitute provisions of this ECSS Standard. For dated references, subsequent amendments to, or revision of any of these publications do not apply. However, parties to agreements based on this ECSS Standard are encouraged to investigate the possibility of applying the more recent editions of the normative documents indicated below. For undated references, the latest edition of the publication referred to applies.This standard applies to satellites and does not apply to launchers and human space flight applications. According to requirement 4.4g of ECSS-E-ST-33-11 this standard covers explosive or non-explosive actuators electronics required to comply with single fault tolerance with respect to actuation success. Interfaces to electrical motors (for example solar array drive mechanisms, reaction wheels, other mechanisms) are not covered by the present standard. It is assumed that the two fault tolerance approach (as per ECSS-Q-ST-40 clause 6.4.2.1), with respect to premature and unwanted actuation having catastrophic consequences, when required according to requirement 4.4h of ECSS-E-ST-33-11， is implemented as a system (SSE and SSS) level provision and not at equipment level. See ECSS-E-HB-20-21 subclause 5.5.1. Current-driven actuators covered by this standard have an inductance of 1 μH max, not including harness. Voltage-driven actuators covered by this standard have an inductance of 20 mH max. BS EN 16603-20-21 pdf download.