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Fan Tray

The fan tray comprises six individual axial fans and a printed circuit board (with the control circuits)

mounted on a metal plate. (See Figure 2.) The fans draw cooling air through the chassis interior to

maintain an acceptable operating temperature for the internal components. The fan tray slides into

the right side of the chassis from the noninterface processor end of the router. The fans draw air in

through the inlet vents on the opposite side of the chassis, across the processor modules and other

internal components, and out through the exhaust vents adjacent to the fan tray. Figure 4 shows a

top-down view of the chassis, with the fan tray on the far right, and the airﬂow path created by the

fans. The sides of the chassis must remain unobstructed to ensure adequate airﬂow and prevent

overheating inside the chassis.

Figure 4

Top view of router

hassis

rflow

ower supply

rflow

A fan control board on the fan tray monitors and controls the operation of the variable-speed fans.

The variable-speed feature enables quieter operation by allowing the fans to operate at less than

maximum speed when doing so provides adequate cooling air to maintain an acceptable operating

temperature for the internal components.

When the internal air temperature is within the normal operating range, the fans operate at the

slowest speed, which is 55 percent of the maximum speed. If the temperature inside the chassis

exceeds the normal range, the fan control board increases the fan speed to provide additional cooling

air to the internal components. If the temperature continues to rise, the fan control board linearly

increases the fan speed until the fans reach full speed (100 percent). If the internal temperature

exceeds the speciﬁed threshold, the system environmental monitor shuts down all internal power to

prevent equipment damage from excessive heat.

The fan control board also relays the status of the fans to the system software. All six fans in the

array must be operational. If the system detects a failed or failing fan, it displays a warning message

on the console screen. If the condition is not corrected within two minutes, the entire system will

shut down to protect the internal components against damage from excessive heat. For an example

of this display, refer to the following section, "Prerequisites."

Internal Air Flow—Top-Down View of Chassis

Service (noninterface processor) end

600W AC-Input Power Supply and Fan Tray Replacement Instructions

Chassis fans

Power supply fans

Interface processor end

Product Overview

Fan tray

Power supply

airflow

Chassis

airflow