Справочник Пользователя для Juniper CBL-M40-PWR-EU
Maintain and Replace Cooling System Components
Maintain the Impeller Assemblies
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Figure 70: Install the Fan Tray
Maintain the Impeller Assemblies
The router has two non-interchangeable impeller assemblies. The lower impeller is located
behind the craft interface at the front the chassis (see Figure 1), and the upper assembly is
located above the fan tray at the rear of the chassis (see Figure 2). They work together to cool
the Packet Forwarding Engine components.
behind the craft interface at the front the chassis (see Figure 1), and the upper assembly is
located above the fan tray at the rear of the chassis (see Figure 2). They work together to cool
the Packet Forwarding Engine components.
During normal operation, the impellers run at less than full speed. The following conditions
automatically cause the impellers to run at full speed and trigger the indicated alarm:
automatically cause the impellers to run at full speed and trigger the indicated alarm:
One of the impellers fails (red alarm).
One of the impellers is removed (yellow alarm). For removal instructions, see the
following sections:
The router temperature exceeds the “temperature warm” threshold (yellow alarm).
The temperature of the router exceeds the maximum (“temperature hot”) threshold (red
alarm and automatic shutdown of the power supplies).
For more information about impeller-related alarms, see “Hardware and Interface Alarm
Messages” on page 192.
Messages” on page 192.
To check the status of the impeller assemblies, issue the
show chassis environment
command.
The output refers to the
Top
and
Bottom
impellers, as shown in this example:
user@host> show chassis environment
Class Item
Status
Measurement
...
Fans Top Impeller OK Spinning at normal speed
Bottom impeller OK Spinning at normal speed
...
For further description of the output from the command, see the JUNOS Internet Software
Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.
Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.
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