Cooling Subsystem; Figure 10. Fan Module - HP Carrier-grade cc2300 Product Manual

Cc2300 Internal Disk Drive Product Numbers
Product Number Disk Capacity Rotational speed Disk Replacement Part Number
A6917A 18 GB
A6942A 18 GB
A6918A 36GB
A6943A 36 GB

Cooling Subsystem

The cooling subsystem contains a fan module consisting of five 40 mm fans to cool the server
board and other components. The fans are installed directly behind the drive tray and are located in
front of the server board. The fan connector is located on the server board. Each fan provides
tachometer signal output to the server board to indicate a fan failure. A fan failure is indicated by
the fan fault LED located on the front panel. The fan module is shown in Figure 10.
Ambient Temperature Control
The system baseboard contains a pulse-width-modulation (PWM) circuit, which cycles the 12 VDC
fan voltage to provide quiet operation when system baseboard temperature is low and there are no
fan failures. Under normal baseboard temperature conditions (less than 45 °C), the fan power
circuit supplies an effective fan voltage of 7.0 VDC. When the baseboard temperature exceeds
45 °C, the fan control circuit ceases cycling and delivers 12 VDC. Following a baseboard
temperature excursion above 45 °C the fan voltage does not reenter PWM mode until the baseboard
temperature drops below 45 °C and all fans are operational.
36
10,000 RPM A6917-69001
15,000 RPM A6942-69001
10,000 RPM A6918-69001
15,000 RPM A6943-69001

Figure 10. Fan Module

cc2300 Carrier Grade Server Product Guide