DataDirect Networks S2A9550, User Manual

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Introduction
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D a t a D i r e c t N e t w o r k s S 2 A 9 5 5 0 U s e r G u i d e
1.2.1 Power Supply and Fan Modules
Each S2A9550 is equipped with four (4) Power Supply/Cooling modules and one (1) fan
module
(Figure 1-3)
. The PSU (power supply unit) voltage operating ranges are nominally
110V or 230V AC, selected automatically.
The four Power Supply/Cooling modules provide redundant power supply and cooling
system for the unit. If one module fails, the other will maintain the power supply and
cooling while you replace the faulty module. The faulty module will still be providing
proper air flow for the system so do not remove it until a new module is available for
replacement.
The four modules are installed in the left and right slots at the front of the unit, behind the
cover panel
(Figure 1-1)
. Each PSU module is held in place by two thumbscrews.
The fan module
(Figure 1-3)
is installed in the front center slot, behind the cover panel, and
is held in place by two thumbscrews.
The LED mounted on the front of the Power Supply/Cooling module indicates the status
of the PSU and the fans
(Figure 1-2)
. It is green when the module is operating normally and
turns red when a fault occurs. (Note: See Status LEDs on rear panel for clarification.)
Figure 1-2 Power Supply/Cooling Module
Status LED
Power Switch
Figure 1-3 Fan Module