A tray of cooling fans provides forced air cooling for components in the ERX routers. The fan trays are hot-swappable; you can replace them without powering down the system. However, if you do not replace the fan tray within approximately 2 minutes, the system enters thermal protection mode. For information about thermal protection mode, see Monitoring Temperatures of Modules.
You can monitor fan status by observing the LEDs on the SRP module or on the fan tray behind the faceplate. For complete LED information, see Understanding Status LEDs to Troubleshoot.
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Note: On the SRP module, when the LED alternates between OK and FAIL in 10–second intervals, a non-critical fan failure exists. Noncritical warnings are not indicated on the fan tray LEDs; if the red FAN FAIL LED is illuminated, either a critical or non-critical failure exists. |
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Caution: If the red FAN FAIL LED on the SRP module is illuminated and none of the fans are spinning when you remove the fan tray, power down the system until a new fan tray is available. Operating an ERX router with inadequate air circulation can damage the modules. |
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Caution: Do not use the fan tray handle to carry the fan tray assembly. Use the handle only to pull the tray out of the chassis. |
Figure 43: Fan Tray in ERX-14xx Models
Figure 44: Fan Tray in ERX-7xx Models
Figure 45: Fan Tray in ERX-310 Router
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