User Service Guide, Third Edition - HP Integrity cx2620 Server

Disconnect Device and Branch Circuit Protection
WARNING! Failure to provide an appropriate disconnect device and branch circuit protection
may endanger service personnel. Serious injury and equipment damage may result if this warning
is not observed.
A suitable disconnect device must be provided as part of the building installation. The purpose
of the disconnect device is to provide an easy and accessible means for removing power from
the product for servicing.
A suitable branch circuit protection device must be provided as part of the building installation.
The purpose of branch circuit protection is to limit current in the case of a fault.
The disconnect device may also provide branch circuit protection (for example, a circuit breaker).
Alternately, separate disconnect and branch circuit protection devices (fuses and a disconnect
switch) may be employed.
The devices must be rated based on the plate rating of the product in accordance with the
applicable local codes and specific customer requirements. Branch circuit protection is commonly
selected based on 125% of the product input rating. Such derating is to avoid nuisance tripping
due to load surges or power transients and to meet code requirements. Applicable codes and
customer requirements will vary.
System Power Specifications
The following tables provide information to help determine the amount of power needed for
your computer room.
Table 2-3 list the power specifications for the server.
Table 2-3 System Power Specifications
ValueSpecification
-48 VDC (-40 to -60 VDC)Nominal Input Voltage
-36 VDCMinimum Operating Voltage
-72 VDCMaximum Operating Voltage
12A DC typical (with V
IN
-48 VDC)Input Current
580W typical (@ 85% efficiency)Input Power
25 AMaximum Inrush Current
49A DC for the 12V output 3.5A DC for the V3.3 sb outputMaximum Output Current from each Power
Supply
82% (minimum)Efficiency
Table 2-4 list the system power requirements for the server including CPUs.
Table 2-4 System Power Requirements
CommentsWattsPower Required
Maximum Theoretical650Maximum configuration
1
580Typical configuration
1 Maximum power is the sum of the worst case power consumption values of every subsystem in your server. These
worst case values should be used to calculate the worst case power consumption for your facility installation.
The server can support one or two processors of the same type and speed.
Table 2-5 list the power consumption values for the CPUs.
48 System Specifications