290 Rockwell Automation Publication 5069-UM002A-EN-P - January 2019
Appendix A Status Indicators
Thermal Monitoring and
Thermal Fault Behavior
The CompactLogix 5480 controllers monitor internal module temperatures.
As shown in
Figure 64, the controller takes actions as the
temperature increases.
Figure 64 - CompactLogix 5480 Controller Thermal Fault Behavior
IMPORTANT • Faults that occur as a result of changing internal module temperature
reporting, are declared when the module is in Run mode or transitions to
Run mode.
• The COS is not aware of increasing internal module temperature and
operates as expected until the controller declares a Hardware
Preservation Fault and power is disabled.
When power is disabled on the controller, the COS shuts down.
Threshold for controller to declare a `Hardware Preservation
Fault’, resetting the module and disabling power.
In the disabled power condition, only the OK status indicator is
illuminated, and it is red. The module does not apply power
until it has cooled below the Hardware Preservation Hysteresis
limit. The module then enters fault mode, records the fault in
the major fault log, and displays `CPU Temperature Fault’ on
the front panel.
Threshold for controller to declare a `CPU Temperature Fault’
major recoverable fault.
If a fault handler does not clear the fault, the module enters
fault mode, records the fault in the major fault log, and displays
`T17:C34 CPU Temperature Fault’ on the front display.
Threshold for controller to declare a `T17:C36 Controller internal
temperature is approaching operating limit’ minor fault and set
the Diagnostics minor fault bit.
The fault is recorded in the minor fault log, but is not displayed
on the front panel. If the temperature returns to an acceptable
range, the Diagnostics minor fault bit clears, but the minor fault
record remains.
Power to the
controller is
disabled
Hardware Preservation
Hysteresis Limit
Power does not
become enabled
when in this range
All power to the controller is disabled except
to run the red OK status indicator and
monitor the temperature.
IMPORTANT If you follow the recommended limits for ambient (inlet) temperature and apply the required clearances around the system, the
controller is unlikely to reach the initial warning (minor fault) temperature.
For more information on CompactLogix 5480 controller specifications, see CompactLogix 5480 Controller Specifications
Technical Data, publication
5069-TD002.
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