Installation Sageon Micro Power Module Manual
PM990-4207-00, Rev 6
3-2
Similarly, the energy hazard associated with the batteries connected to the DC bus must be addressed through the
use of appropriately insulated tools and other measures to prevent accidental short circuits to the DC bus.
Figure 3.2 Opening top rear cover to access wiring
To open the top rear cover, remove the two rear M3 screws securing the cover to the back. The top cover will then
hinge up to provide access to the wiring.
To gain further access to the wiring, remove the rear cover grills by removing the two screws holding each 1U grill.
3.2 OVERVIEW OF EXTERNAL WIRING CONNECTIONS
Figure 3.3 shows the internal and interface schematic for the Sageon Micro Powershelf. For the purpose of
indicating how a system is connected, the same schematic applies to other Power shelf products. The system shown
is for a –48V system where the positive side of the DC bus is tied to ground, usually on the common return bar. For
+24V systems, the opposite is usually the case with the negative DC bus being connected to the common return bar
that is in turn grounded. It is also possible to float the output, but under these conditions, there is no guarantee that
all voltages on the DC bus will stay below the Safety Extra-Low Voltage (SELV) limits with respect to ground
during fault conditions.
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