1 / 2

3CS Wire Protection

3CS Wire Protection. 3CS does not currently meet the requirements of TA-92-038. 3CS polyswitch trip current 14A. Wire (22AWG) is good for only 9.5 A.

truda
Download Presentation

3CS Wire Protection

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 3CS Wire Protection • 3CS does not currently meet the requirements of TA-92-038. • 3CS polyswitch trip current 14A. Wire (22AWG) is good for only 9.5 A. • Although considered a dead bus, NASA has clarified that wiring in the vicinity of the battery (i.e., any energized portion of the circuit) must adhere to the circuit protection requirements of TA-92-038. • Nanosat-2 will take steps to bring the hardware into compliance with TA-92-038 • Several options being considered, including procedural and hardware changes • Hazard reports and FSDP to be changed to state Nanosat-2 compliance with TA-92-038.

  2. 3CS Wire Protection - Options • Modifications to the 3CS circuit • Incorporate cartridge type fuse with reduced blow characteristics and/or… • Replace wiring from the battery to EPS with higher capacity wiring • Flying with 3CS batteries drained • Need to establish the minimum discharge requirements for the batteries. • Mission success issue: limited time to charge batteries, initiate EEDS and activate Lightband. • No-changes option • Requires analysis to determine safety impact of existing design. • Requires pyro- and failure analysis.

More Related