Dc-Powered Systems; Environmental Specifications; Temperature And Humidity; Operating Environment - HP rp7420 Service Manual

NOTE:
1. "Maximum theoretical power" is used to describe input power at the AC input. It is expressed
in Watts and Volt-Amps to take into account power factor correction. The calculated sum
is the maximum worst case power consumption for every subsystem in the server. This
number will not be exceeded by a properly functioning server for any combination of
hardware and software.
2. "Marked electrical power" is the input power measured at the AC input expressed in
Volt-Amps. The marked electrical power is the rating given on the chassis label and represents
the input power required for facility AC power planning and wiring requirements. This
number represents the expected maximum power consumption for the server based on the
power rating of the bulk power supplies. This number can safely be used to size AC circuits
and breakers for the system.
3. "Typical maximum power" is the input power measured at the AC input expressed in Watts
and Volt-Amps, and the measured maximum worst case power consumption. This number
represents the largest power consumption for the server under laboratory conditions, using
aggressive software applications designed specifically to work the system at maximum loads
and power consumption.

DC-Powered Systems

DC-powered systems must be powered by a -48 VDC Telco power source. Follow your site-specific
procedures for connecting the power and return lines to the server.

Environmental Specifications

This section provides the environmental, power dissipation, noise emission, and airflow
specifications for HP Integrity rx7620 servers.

Temperature and Humidity

The cabinet is actively cooled using forced convection in a Class C1-modified environment.

Operating Environment

The system is designed to run continuously and meet reliability goals in an ambient temperature
of 5° to 35° C at sea level. The maximum allowable temperature is derated 1° C per 1000 feet of
elevation above 5000 feet above sea level up to 30° C at 10,000 feet. For optimum reliability and
performance, the recommended operating range is 20° to 25° C

Environmental Temperature Sensor

To ensure that the system is operating within the published limits, the ambient operating
temperature is measured using a sensor placed near the chassis inlet, between the cell boards.
Data from the sensor is used to control the fan speed and to initiate system overtemp shutdown.
(For more details see the platform management section.)

Non-Operating Environment

The system is designed to withstand ambient temperatures between -40° to 70° C under
non-operating conditions.

Cooling

Cell Section Cooling

The cabinet incorporates front to back airflow across the cell boards and system backplane. Two
150 mm fans, mounted externally on the front chassis wall behind the cosmetic front bezel, push
air into the cell section; and two 150 mm fans housed in cosmetic plastic fan carriers and mounted
externally to the rear chassis wall, pull air through the cell section.
Environmental Specifications 111