Figure 3.14. Schematic of the control of the Apollo APDA. 1. 115 V 400 Hz; 2. 27 V: 3. actuate latches; 4. 5 V; 5. lock force sensors; 6. docking mechanism drive; 7. latch drive; 8. back-up undocking drive; 9. electromagnets of the hull latches; 10. extend docking mechanism; 11. retract docking mechanism; 12. open locks; 13. close locks; 14. back-up undocking; 15. indication; 16. hull latch sensors; 17. sensor of retracted state of ring; 18. linkage sensors; 19. DSS [expansion unknown] sensors; 20. sensors for extended position of ring; 21. locks dosed; 22. locks open; 23. passive readiness; 24. linkage; 25. alignment of joint; 26. ring extended. for various types of failures is provided by 1) the presence of two completely identical and independent electromechanical subsystems A and B; 2) the great possibilities of the human operator recognizing the failures of individual elements, choosing, and implementing a back-up form of control, and cutting off all main
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