Warning
Failure to follow recommendations below may cause personal injury or damage
electronic equipment. An electrical voltage of up to 75 VDC may be present at any power
connection.
Unpacking
The 1U power enclosure and the DC cables are shipped together in in the same box. The power
supplies and the AC power cords may be packed separately.
1.
Remove the 1U power enclosure and the four DC power-feed cables from their packaging.
All these cables have:
•
1" stripped off on one end.
•
Insulated terminal lug on the other end.
The cables have the following characteristics:
Color
Length
Voltage
Gauge
Red
27"
+48V
8 AWG
Red
17"
+48V
8 AWG
Black
27"
-48V
8 AWG
Black
17"
-48V
8 AWG
2.
Remove the power supplies and the AC power cords from their packaging. Each power
supply has two AC power cords provided; a U.S. version (125 VAC) and a European version
(250 VAC). Use the AC power cord applicable to your installation site.
Installation Site Preparation
Verify that the installation site meets the following requirements:
•
Access to the installation site and the equipment must be restricted to qualified personnel.
•
Determine how the cables will be routed between the power enclosure and the main power
source, and between the power enclosure and the chassis Power Entry Modules (PEMs).
•
Each power supply is capable of drawing 15A @120 VAC (7.5A @ 240VAC). Each AC power
cord must be connected to a separate circuit. Do not attempt to operated multiple power
supplies from a single power source.
Connecting Frame-grounded Cables
Connect frame-ground cables to the chassis before proceeding to connect DC cables to the
power enclosure and the chassis.
Connecting DC Cables to the Power Enclosure
Use a DC multi-meter (DMM) if you are unsure of the polarity and the voltage output of the
connections on the power enclosure when performing these procedures.
Chapter 8: The Power Enclosure
30