Product data

−48 Volt Power Supply (Model DU3 Only)
The −48 Volt Power Supply feature provides power supply assemblies that allow a 2104
Model DU3 to be connected to −48 volt power sources. The 2104 must be connected to
two separate power sources to ensure that operations are not interrupted if one power
source fails. The −48 Volt power distribution panel (PDP) in the rack provides the power
sources and the power cables. For details about how to connect a 2104 Model DU3 to
a −48 volt power source, see the 2104 Model DU3: Installation Guide.
Attention:
v If the −48 Volt PDP uses 15-amp circuit breakers, and the 2104 contains at least one
18.2 GB, 10000 rpm disk drive module, the 2104 must contain no more than nine
disk drive modules. Otherwise, no limitations exist for other types of disk drive
module.
If the −48 Volt PDP uses 20-amp circuit breakers, no limitations exist for any types of
disk drive module.
v Both power supply assemblies in a 2104 must be of the same voltage rating. Do not
mix power supply assemblies of different voltage ratings.
4 2104 Service Guide