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PRO.LB.0.NT.003.ASC Issue. 6 rev. 3 Page: 3.35 PL - 4.4.3 - 7 a The following general rule on wiring shall be applied unless special approval has been granted: a. wiring shall be sized to provide a maximum voltage drop for power lines of 240 mV between source and user. For telemetry lines, this value can be as high as 1.0 V depending on the telemetry system parameter. b. wiring size and shield shall be : • No 20, 22 and 24 AWG twisted shielded pairs for secondary power distribution. If flexible wiring is utilized, it shall be EMI controlled, and in accordance with MIL-P-50884B. • No 26 AWG single through nine conductors twisted shielded wire for control and monitor. PL - 4.4.3 - 8 For explosive parts, all circuits shall use twisted double shielded pair wires. The return side of the circuits shall be grounded at the power supply. Shield shall be grounded at both ends of the harness. PL - 4.4.3 - 9 When feasible, redundant wiring shall be routed in separate wire bundles. Separation of wire bundles shall be maintained to the maximum extent possible, including the use of separate connectors, if necessary. PL - 4.4.3 - 10 Spare wires shall not be provided in wiring harness terminating in removable crimp-contact connectors. PL - 4.4.3 - 11 EMI controls on printed flexible wiring includes shielding and guard conductors. A circuit pattern may have shields on one or both sides. Additional shielding may be used on circuit edges if necessary. Top and bottom shielding may be added as solid conductive material connected and tied electrically. Insulation layers (covercoats) are normally used as outside layer. Guard conductors are effective in reducing adjacent trace coupling (crosstalk). PL - 4.4.3 - 12 Every cable submitted to the external environment (i.e external to the Payload Instrument Module) shall be overshielded. All right reserved. ALCATEL SPACE /CNES Passing and copying of this document, use and communication of its content is not permitted without prior written authorization.
PRO.LB.0.NT.003.ASC Issue. 6 rev. 3 Page: 3.36 4.4.4 ISOLATION PL - 4.4.4 - 1 Onboard power, supplied by inverters, converters and transformer isolated power supplies, shall be defined as secondary power and shall be referenced to the mechanical ground at one location, at the secondary power source, via the shortest possible low impedance path. For those types of equipments, secondary power return is connected to the mechanical ground. In this case, the DC resistance between secondary power return line and mechanical ground shall be less than 2.5 mΩ. Remote sensors, pressure sensors, magnetometers, or assemblies without internal power supply may be exempt from the above requirement and secondary power return is isolated from the mechanical ground. PL - 4.4.4 - 2 Primary power : All the users shall maintain an electrical isolation of at least 1 MΩ shunted by not more than 50 nF between: • primary power positive and chassis, • primary power return and chassis, • primary power return and secondary power return. PL - 4.4.4 - 3 Secondary power: except secondary single point referenced, all the sources and loads shall maintain an electrical isolation of at least 1 MΩ shunted by not more than 50 nF between: • secondary power positive and chassis, • secondary power return and chassis, • primary power return and secondary power return. At no time the satellite will impose more than 1.5 V DC and 1 V peak to peak, from 15 kHz to 180 KHz, falling to 0.2 V at 15 MHz, between the primary return and secondary return. All right reserved. ALCATEL SPACE /CNES Passing and copying of this document, use and communication of its content is not permitted without prior written authorization.
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Title PUM 6.3 Appendix C - STA IDS
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PL_Mechanics PUM 6.3 Appendix C - S
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Drawings PUM 6.3 Appendix C - STA I
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All right reserved ALCATEL SPACE/CN
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