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ACX6160 Cooling System

ACX6160 Cooling System Description

Fan Modules

The cooling system in an ACX6160 consists of fan modules and a single fan in each power supply. There are five fan modules in the ACX6160, each fan module has two fans.

The fan modules in the ACX6160 are hot-insertable and hot-removable field-replaceable units (FRUs). These fan modules are designed to work with the airflow out direction. The fan modules are installed in the fan module slots on the rear panel of the device next to the power supplies. The ACX6160 has five fan modules numbered 0 through 4 from left to right. Each fan module slot has a fan icon next to it.

Figure 1 shows the location of the fan modules on the device. Figure 2 shows an example of a fan module.

Figure 1: ACX6160 Rear PanelACX6160 Rear Panel
Management panel
Power supplies (2)
Fan modules (5)

You remove and replace a fan module from the rear panel of the chassis. The device continues to operate for a limited period of time (4 minutes) during the replacement of the fan module without thermal shutdown. Figure 2 shows the fan module for the ACX6160.

Figure 2: ACX6160 Fan ModuleACX6160 Fan Module

All fan modules must be installed for optimal operation of the device.

Table 1 lists the fan information.

Table 1: ACX6160 Fan Module

Fan Module

Label on the Fan Module

Direction of Airflow in the Fan Module

Power Supply to be Installed



Port-to-FRU, that is, air comes in through vents on the end with ports; air exhausts out the end with the fans (also known as front-to-back airflow).

You must install only power supplies that have AIR OUT labels in devices in which the fan modules have AIR OUT labels.

Airflow Through the Chassis

In the ACX6160 cooling system, cool air enters through the vents in the front panel and hot air exhausts through the rear (FRU) panel. This type of airflow is known as airflow out or port-to-FRU airflow. The airflow direction on the ACX6160 is airflow out, air comes into the device through the vents in the front panel. When the chassis is installed, it must be positioned so that the FRUs are next to the hot aisle. Figure 3 shows the airflow through the chassis.

Figure 3: Airflow Through the ACX6160 Chassis (Port-to-FRU)Airflow Through the ACX6160 Chassis (Port-to-FRU)

Under normal operating conditions, the fan modules operate at a moderate speed. Temperature sensors in the chassis monitor the temperature within the chassis. The system raises an alarm if a fan module fails or if the ambient temperature inside the chassis rises above the acceptable range. If the temperature inside the chassis rises above the threshold temperature, the system shuts down automatically.

ACX6160 Fan Module LEDs

Figure 4 shows the location of the LED next to the fan module.

Figure 4: Fan Module LEDs on an ACX6160Fan Module LEDs on an ACX6160
Fan module LED

Use Table 2 describes the function of the fan module LED.

Table 2: ACX6160 Fan Module LED

LED Color

LED State




An error is detected in the fan module. Replace the fan module as soon as possible. Either the fan has failed or it is seated incorrectly. To maintain proper airflow through the chassis, leave the fan module installed in the chassis until you are ready to replace it.


On steadily

The fan module is operating normally. The system has verified that the module is engaged, that the airflow is in the correct direction, and that the fan is operating correctly.