User manual

Chapter 8: Internal Devices
Automatic Shutdown Process
8580/8590 Vehicle-Mount Computer User Manual 121
8.8.1 Automatic Shutdown Process
When the ignition is switched on, the 8580/8590 is supplied with power and begins check-
ing its internal temperature and automatic shutdown function.
Once the ambient conditions have been verified as acceptable, the 8580/8590 starts the oper-
ating system just like normal.
During the first three minutes of the start-up phase, none of the ambient conditions, such as
the internal temperature or the Ignition input status, are checked. This allows the operating
system and the operating software for the automatic shutdown module to fully load without
interruption. Following this three-minute period, the internal temperature of the unit and the
status of the Ignition input are checked continuously. If the inner temperature of the
8580/8590 reaches a critical range, the operating system is shut down normally and the com-
puter remains switched off until the temperature returns to an acceptable operating range.
If the Ignition input is switched to DC- or a potential-free source during normal operation,
the unit switches to shutdown delay time. In this state, the device continues to operate nor-
mally until the delay time (for example, 15 minutes) has elapsed.
• If the ignition is switched to DC+ again during this time, the 8580/8590 resumes normal
operation.
• If, however, the delay time elapses, the operating system is shut down normally by the
8580/8590 operating software and the unit is automatically switched off (for example,
after three minutes, or after a signal from the operating software).