36 Rockwell Automation Publication 5069-UM002A-EN-P - January 2019
Chapter 1 CompactLogix 5480 System
– Major Non-recoverable Fault - This occurs when the controller
temperature exceeds 37.77 °C (100 °F).
In this case, the controller stops operating and powers down to
preserve hardware integrity, that is, capability to run properly in the
future. When the controller shuts down, the COS shuts down as
well.
Before the shutdown, however, any Compact 5000 I/O modules in
the system receive a power shutdown indication.
You must replace both fans and restart the controller. As a result, the
COS starts again. The fans resume operation at full speed to cool the
controller temperature. The controller does not resume normal
operation until it reaches an acceptable operating temperature.
The fault code is T17:C37. The code appears only after the
controller powers back up.
In your Logix Designer application project, you can use the Major Faults
tab on the Controller Properties dialog box to monitor for a fault.
You can order replacement fans. Replacement fans come in pairs. The fans are
unique by position and keyed to help make sure that you install the correct fan
in each position.
Replacement fans are available from your local Allen-Bradley distributor or
Rockwell Automation sales representative via catalog number 5069-FANKIT.
The fans are labeled Fan 1 - Top and Fan 2 - Bottom.
Consider the following:
• We recommend that you replace the fans in pairs. That is, if you must
replace one fan, we recommend that you replace the other fan too.
• You can replace fans during controller operation. The fans support
removal and insertion under power.
• Do not remove both fans at once if the controller is operating.
As indicated previously, the removal of both fans simultaneously when
the controller is operating can cause the controller to exceed the
maximum operating temperature. When the maximum operating
temperature is exceeded, the controller experiences a major fault and
stops operating.
IMPORTANT
If you replace fans while the controller is operating, do not touch
live voltage components.
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