Chapter 2. CPU Features & Specifications28 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD2.1.9 CPU Over-Temperature Monitoring and BehaviorRX3i CPE302, CPE305, CPE310, CPE330, and CPE400 models monitor the internal temperature of theCPU.• 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 differenttemperature specification.• If the temperature continues to rise and reaches the specification limit, the CPU goes into afirmware-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 torestart.• If the CPU is manually restarted before the temperature drops to the automatic restart level, theCPU 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 beenconnected to an Energy Pack. If there is no Energy Pack connected, or if the Energy Pack hasdischarged, the Overtemp Fault will be lost.• The CPE400 always turns off its TEMP LED at power-up.
