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10
MW800 CPU Owner's Manual
Low Temperature Conditions
The device supports working hard disk conditions even if it's turned off. When the
ambient temperature drops below the low hard disk operational limit, an internal
heater will automatically adjust and maintain the working conditions (see Hard disk
heating when device is off parameter in section 3) for pre-defined time.
• If the CPU is turned on when Hard disk heating when device is off time-out
has not expired yet and the hard disk temperature is within the operating
range, the CPU will boot up immediately.
• If the CPU is turned on when Hard disk heating when device is off time-out
occurs and the hard disk temperature is below the low hard disk operational
limit, the CPU will activate the internal heater and will boot up only when the
hard disk temperature returns to the operating range. The heating process
takes some time that can be optimized (see Heater optimization parameter
in section 3); please wait until this process is completed.
NOTE: If the power source is a 9VDC car battery (see Power source parameter in
section 3), the device will not power up when the temperature range is below the low
operational limit.
High Temperature Conditions
The device will be turned on only if an ambient temperature does not exceed the high
operational limit.
NOTE: In extreme conditions, the overall performance of the device (including boot
up time and sustained operations) may be degraded. It will return to normal when the
ambient temperature returns to the operating range.
CAUTION: If overheating, do not turn on the device until it cools down.
Discharged Vehicle Battery
If the power source is a 13.8VDC car battery (see Power source parameter in section
3), the device will normally power up when the voltage level exceeds 10.3VDC.
If the power source is a 9VDC car battery (see Power source parameter in section
3), the device will normally power up when the voltage level exceeds 9VDC.
Shut Down
This chapter describes methods to power off the CPU box in normal and extreme
conditions.
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