Chapter 2. CPU Features & Specifications
28 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD
2.1.9 CPU Over-Temperature Monitoring and Behavior
RX3i CPE302, CPE305, CPE310, CPE330, and CPE400 models monitor the internal temperature of the
CPU.
• If the temperature rises to a near-critical level, these CPUs set the CPU Over Temperature Fault
(refer to section 3.2.7). The actual temperature varies from CPU to CPU, as each has a different
temperature specification.
• If the temperature continues to rise and reaches the specification limit, the CPU goes into a
firmware-controlled reset.
• Uniquely, the CPE400 turn on its TEMP LED, using amber.
• Following reset, the CPU continues to monitor the internal temperature.
• If the temperature falls sufficiently (i.e. by 10°C or 18°F), the CPU will automatically attempt to
restart.
• If the CPU is manually restarted before the temperature drops to the automatic restart level, the
CPU will attempt to restart, and will monitor its internal temperature as before.
• Upon successfully restarting, the Overtemp Fault will be recovered, providing the CPU has been
connected to an Energy Pack. If there is no Energy Pack connected, or if the Energy Pack has
discharged, the Overtemp Fault will be lost.
• The CPE400 always turns off its TEMP LED at power-up.
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