34 | Installing Backup Power
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Installing the Backup DC Power Supply for the S50N
The Redundant Power Supply Unit (PSU) for the S50N is a 180W AC/DC rectifier. It is less powerful
than the S50V PSU, because it does not need to support PoE.
This 180W PSU is the same as used for the S50, so it can be housed in the External Power Shelf supplied
for the S50. It does not have screw holes for rack ears, so it cannot be hung in a rack by itself.
CAUTION: Use only the power cords supplied with the power supply. Do not supply power to the system until
the power supply and modules have been installed.
DC Components
• The External Power Shelf (EPS) (Catalog# SA-01-EPS)
• S50/S50N Power Supply Unit (PSU) (Catalog# SA-01-PSU), an external AC-to-DC rectifier
• PSU mounting hardware: captive screws for attaching the unit to the External Power Shelf (EPS)
2 Insert the plastic plug of the DC-to-DC cable into the receptacle on the lower left side of the DC Power Module
(DPM), which is the bottom box in
Figure 5-9
.
Note that one of the three leads on the plug has a trapezoidal key , which goes in the receptacle that is toward
the center of the PSU. The key is not strong enough to resist being inserted in the opposite receptacle, and it is
difficult to see, so you must take care to insert it correctly. To help you orient it, note that the top side of the plug
has a knurled pattern.
Figure 5-9. DC-to-DC Connection
3 Tighten the captive screws on the sides of the connector cable by turning them clockwise.
4 Insert the supplied AC-to-AC cable into the AC receptacle of the DC power supply. Ideally, you should connect
that cable to an AC source separate from the AC connection made directly to the S50V.
Step Task
DC-to-DC Cable
fn00153s50V
DC Power Module
11.5
FG
-48V
RTN
-48V
Current
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