Sun Microsystems Rack, Руководство по обслуживанию

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13
C H A P T E R
2
Troubleshooting
Power Sequencer
FIGURE 2-1
shows only one AC circuit in a power sequencer. There are four of these
circuits for the odd (1-7) outlet groups and five more for the even (0-8) outlet groups.
Outlet Group 9 is unswitched.
FIGURE 2-1
Simplified Block Diagram of a Single Circuit in a Power Sequencer
AC to outlet group 1
Control for outlet group 1
Control for outlet
AC Input
Fault (LED)
Ready (LED)
~ AC 1-9
ODD (LED)
groups 3, 5, and 7
Power switch for
outlet groups 1-9
Control
AC to relays for outlet
groups 3, 5, and 7
AC to outlet group 9 (unswitched)