IBM 8265 Nways ATM Switch, Installation Manual

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Verifying Fan Operation
To verify that all fan units are operating normally:
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Visually inspect all fans, making sure that each is turning without interruption.
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Check that a fan fault is not indicated by checking the FAN LEDs. There are three FAN LEDs, one for
each fan unit. These LEDs are located on the front panel of the Controller modules and CPSW2
modules. Depending on your installation you should check the LEDs:
– On the Controller module if you are using the standard CPSW module or the CPSW2 module with
integrated power control disabled (FORCE RCTL jumper set to ON on the CPSW2 module). If you
have two Controller modules installed, you should check the LEDs on the active module.
– On the CPSW2 module if you are using the integrated power management functions (FORCE
RCTL jumper set to OFF on the CPSW2 module). If you have two CPSW2 modules installed, you
should check the LEDs on the active module. If you have CPSW2 modules installed, but have
disabled power management, you must check the LEDs on the active Controller module.
Each FAN LED should be on. If the LED is off or blinking, refer to Appendix A, “Troubleshooting” on
page 55.
Ÿ
Check that the Temp LED (on the active Controller module or the active Advantage CPSW module,
depending on which is being used for power management) is off, indicating normal 8265 internal
operating temperature.
If the LED is blinking or on, it indicates excessive internal operating temperature. This may mean that:
– One or more fans are not functioning normally
– Ventilation holes are blocked
– Fan exhaust temperature (internal 8265 operating temperature) is above 60 °C, (140 °F).
Fan exhaust temperature is the temperature of air inside the 8265 as it passes out the back of
each exhaust fan. Heat produced by circuit boards and power supplies accounts for most of this
warm air. Fan exhaust temperature is measured by a temperature sensor located at the rear of
each fan unit
Chapter 7. Completing the Installation
49