CEN/TR 17603-20-21:2022

SLOVENSKI STANDARD
01-marec-2022
Vesoljska tehnika - Smernice za električno načrtovanje in zahteve vmesnikov za
prožilnike
Space engineering - Guidelines for electrical design and interface requirements for
actuators
Raumfahrttechnik - Richtlinen für das elektrische Design und die
Schnittstellenanforderungen von Stellmotoren
Ingénierie spatiale - Règles de design électrique et exigences d’interfaces pour les
actionneurs
Ta slovenski standard je istoveten z: CEN/TR 17603-20-21:2022
ICS:
49.140 Vesoljski sistemi in operacije Space systems and
operations
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT CEN/TR 17603-20-21

RAPPORT TECHNIQUE
TECHNISCHER BERICHT
January 2022
ICS 49.140
English version
Space engineering - Guidelines for electrical design and
interface requirements for actuators
Ingénierie spatiale - Règles de design électrique et Raumfahrttechnik - Richtlinen für das elektrische
exigences d'interfaces pour les actionneurs Design und die Schnittstellenanforderungen von
Stellmotoren
This Technical Report was approved by CEN on 29 November 2021. It has been drawn up by the Technical Committee
CEN/CLC/JTC 5.
CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium,
Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

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© 2022 CEN/CENELEC All rights of exploitation in any form and by any means
Ref. No. CEN/TR 17603-20-21:2022 E
reserved worldwide for CEN national Members and for
CENELEC Members.
Table of contents
European Foreword . 5
Introduction . 6
1 Scope . 7
2 References . 8
3 Terms, definitions and abbreviated terms . 9
3.1 Terms from other documents . 9
3.2 Abbreviated terms. 9
4 Explanations . 11
4.1 Explanatory note . 11
4.2 How to use this document . 11
5 Actuators Interface . 12
5.1 Type of actuators . 12
5.2 Coverage assumptions . 16
5.3 Actuators electronics, general architecture . 17
5.3.1 Overview . 17
5.3.2 ARM block . 21
5.3.3 SELECT block . 21
5.3.4 FIRE block . 22
5.4 Actuators electronic, timing sequence. 22
5.5 Actuator electronics, failure tolerance . 24
5.5.1 Double failure tolerance . 24
5.5.2 Single failure tolerance . 26
6 Explanation of ECSS-E-ST-20-21 Interface Requirements . 27
6.1 Functional general . 27
6.1.1 General . 27
6.1.2 Reliability . 27
6.2 Functional source . 29
6.2.1 General . 29
6.2.2 Reliability . 30
6.2.3 Commands . 33
6.2.4 Telemetry . 35
6.3 Functional load . 38
6.3.1 General . 38
6.3.2 Reliability . 39
6.4 Performance general . 39
6.4.1 General . 39
6.5 Performance source . 42
6.5.1 Overview . 42
6.5.2 General . 44
6.5.3 Reliability . 45
6.5.4 Telemetry . 46
6.5.5 Recurrent products. 46
6.6 Performance load . 48
6.6.1 General . 48
6.6.2 Reliability . 48
6.6.3 Recurrent products. 49

Figures
Figure 5-1: Dassault pyro initiator . 13
Figure 5-2: Pyro-valve (to be equipped with pyro initiators) . 13
Figure 5-3: Thermal knife (partially reusable – needing refurbishment) . 14
Figure 5-4: Thermal knife activation (partially reusable – needing refurbishment). 14
Figure 5-5: Thermal knife (with thermal heads visible) . 14
Figure 5-6: Glenair heavy duty HDRM (partially reusable – needing refurbishment) . 14
Figure 5-7: TINI Aerospace Frangibolt (reusable – manually resettable) . 15
Figure 5-8: NEA split-spool based HDRM (partially reusable – needing refurbishment). 15
Figure 5-9: Arquimea pin-puller family (reusable – manually resettable) . 15
Figure 5-10: Typical actuators electronic block diagram . 18
Figure 5-11: Typical actuators electronic block diagram, variant 1 . 19
Figure 5-12: Typical actuators electronic block diagram, variant 2 . 20
Figure 5-13: Actuators electronics timing sequence . 23
Figure 5-14: Actuators electronics timing sequence, different selected lines . 24
Figure 6-1: Actuator electronics {V, I} characteristic . 40
Figure 6-2: Example - case 1. 40
Figure 6-3: Example - case 2. 41
Figure 6-4: Example - case 1 and 2 . 41

Tables
Table 5-1: Actuators reusability . 13
Table A-1 : Current driven, non-explosive actuators . 51
Table A-2 : Current driven, explosive actuators . 53
Table A-3 : Voltage driven actuators. 54

European Foreword
This document (CEN/TR 17603-20-21:2022) has been prepared by Technical Committee
CEN/CLC/JTC 5 “Space”, the secretariat of which is held by DIN.
It is highlighted that this technical report does not contain any requirement but only collection of data
or descriptions and guidelines about how to organize and perform the work in support of EN 16602-
20.
This Technical report (CEN/TR 17603-20-21:2022) originates from ECSS-E-HB-20-21A.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CEN by the European Commission and
the European Free Trade Association.
This document has been developed to cover specifically space systems and has therefore precedence
over any TR covering the same scope but with a wider domain of applicability (e.g.: aerospace).
Introduction
The present handbook, and the relevant standard ECSS-E-ST-20-21, have been produced in a general
context to provide stable electrical interface specifications (both for the source and the load, for
functional and performance aspects).
The convergence within ECSS among agencies, of Large System Integrators and of a representative
group of electronic manufacturers on the identified requirement set can provide an effective way to
get more recurrent products for generic use, both for the actuator electronics (power source), and for
the actuators themselves, in a rather independent way from the final application.
The standard ECSS-E-ST-20-21 has therefore to be intended as a standard for product development,
and the present handbook as a guideline to understand the relevant requirements, the typical issues of
the actuators interfaces both at system and at equipment level.
This handbook complements ECSS-E-ST-20-21, and it is directed at the same time to power system
engineers, who are specifying and procuring units supplying and containing electrical actuators, to
power electronics design engineers, who are in charge of designing and verifying actuator electronics,
and to electrical actuators designers.
For the system engineers, this document explains the detailed issues of the interface and the impacts
of the requirements for the design of the actuator chain.
For design engineers, this document gives insight and understanding on the rationale of the
requirements on their designs.
It is important to notice that the best understanding of the topic of Actuators Electrical Interfaces is
achieved by the contextual reading of both the present handbook and the ECSS-E-ST-20-21.
Scope
In general terms, the scope of the consolidation of the electrical interface requirements for electrical
actuators in the ECSS-E-ST-20-21 and the relevant explanation in the present handbook 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
European space agencies, 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.
In particular, the scope of the present handbook is:
• To explain the type of actuators, the principles of operation and the typical configuration of the
relevant actuator electronics,
• To identify important issues relevant to electrical actuators interfaces, and
• To give some explanations of the requirements set up in the ECSS-E-ST-20-21.
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