The LED
turns on to indicate that the internal power supply temperature has exceeded approximately 95 °C. If the
internal supply temperature rises to approximately 100 °C, the supply may shut down. Because of the
many variables involved (ambient temperature, load, thermal conductivity variations), there is no accurate
way of predicting the time between the indication of overtemperature (LED illuminated) and power supply
shutdown.
If this LED is turned on, verify that the fans in the power supply chassis are turning and free of dust and
other obstructions, and that the temperature around the power supply is less than 55 °C. If the power
supply is cooled down without delay, it can recover from this situation without shutting down. This LED
will turn off once the internal power supply heat sink temperature falls below approximately 90 °C.

POWER SUPPLY FAULT LED—This red LED turns on when one of the supply’s three power converters
has shut down or one or more of the supply levels is below internally specified levels. If this LED is on,
check for a short circuit on external devices connected to the control’s power supply. When the short
circuit has been removed, the supply will resume normal operation (Note that if the 24 V or 5 V outputs
are shorted, these power converters will be latched OFF and can only be cleared by removing the shorted
condition and removing the input power for 1 minute (or until the front panel LEDs extinguish). If no short
circuit is found, reset the supply by removing input power for one minute. If the power supply is still not
functioning after input power has been restored, verify that the supply is properly seated to the
motherboard connector. If the supply is properly seated but is not working, then replace the supply.
Simplex Power Supply Checks
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