Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 51
If the system is configured with the 68040 or 68060 CPU, perform step #4. If the system is configured
with the Windows NT CPU, skip step #4 and go to step #5.
4. Toggle the CPU’s RESET switch up, then back to its normal down position. The CPU’s red Fault and
Watchdog LEDs should turn off, and the green RUN LED should go on. At this time, the CPU is
performing the self-diagnostic and boot-up processes. When the CPU has completed its diagnostic
tests, all red LEDs on the CPU module or I/O modules should be off, and the control will begin
running the application program.
5. Plug in the mouse/keyboard/monitor. The CPU will automatically boot into Windows NT and run the
application.
5.5—Power Supply Troubleshooting
System diagnostic routines continuously monitor each main power supply for proper operation. If a fault
condition is detected, the fault is annunciated and the supply’s output disabled. If necessary, use the
power supply’s front panel LEDs to assist in diagnosing any related problems. If all supply LEDs are off
(not illuminated), it is probable that input power is not present, and verification should be made.
5.5.1—Power Supply LED Descriptions
OK LED—This green LED turns on to indicate that the power supply is operating and that no faults are
present.
INPUT FAULT LED—This red LED turns on to indicate that the input voltage is either above or below the
specified input range. If this LED is on, check the input voltage, and correct the problem. Long-term
operation with incorrect input voltages may permanently damage the power supply. Once the input
voltage is within the supply’s input specifications, this LED will turn off. Refer to the power supply input
specifications.
OVERTEMPERATURE LED—This red LED gives an early warning of a thermal shutdown. The LED
turns on to indicate that the internal power supply temperature has exceeded approximately 80 °C. If the
internal supply temperature rises to approximately 90 °C, the supply will 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 fan in the power supply chassis is turning and is 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 heatsink temperature falls below approximately 75 °C.
POWER SUPPLY FAULT LED—This red LED turns on when one of the supply’s four power converters
has shut down. 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. 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.
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