System Fans; Resetting The Power Supply; Environmental Specifications - HP xw4550 Service And Technical Reference Manual

System fans

The workstation includes a rear chassis fan, one processor heatsink fan, and one power supply fan. An
optional front PCI fan is available for special considerations, such as graphics PCI cards.

Resetting the power supply

If an overload triggers the power supply overload protection, all power is immediately disconnected. To
reset the power supply unit:
1. Disconnect the power cord.
2. Determine what caused the overload and correct the problem.
3. Reconnect the power cord, apply power, and reboot the workstation.
NOTE: When you power down your workstation with the power button on the front panel, the power
consumption falls below 10W. To reach zero power consumption, remove power from the workstation.
For additional information on power-saving features, see your operating system documentation.

Environmental specifications

This section describes environmental specifications of your workstation.
Table 1-11 Environmental specifications
Temperature (operating)
Temperature (non-operating)
Humidity (operating)
Humidity (non-operating)
Altitude (operating)
Altitude (non-operating)
Shock (operating)
Shock (non-operating)
Vibration (operating)
Vibration (non-operating)
12 Chapter 1 Product overview
40°F to 95°F (5°C to 35°C)
-40°F to 140°F (-40°C to 60°C)
8% to 85% RH, non-condensing
8% to 90% RH, non-condensing
0 to 10,000 ft. (3,048m)
0 to 30,000 ft. (9,144m)
1/2-sine: 40G, 2-3 ms
1/2-sine: 160 cm/s, 2-3 ms (~100 g)
Square: 20G, 422 cm/s
NOTE: Values represent individual shock events and are not
indicative of repetitive shock events.
Operating random: 0.5G rms, 5–300 Hz
Random: 2.0G (rms), 10-500 Hz
NOTE: Values are not indicative of continuous vibration.
ENWW