MAN0002
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Epec Mobile PC
User manual
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26.06.2008
11
PRE-HEATING AND NORMAL HEATING
11.1
Pre-heating
Pre-heating is required if fast start-up of the hardware is important. Pre-heating can be
switched on e.g. through the control provided by a fuel heater (e.g. Webasto).
All heating modes are controlled by means of the
μ
C block integrated into the central
processing unit. The internal heaters are protected by means of thermostats and
against shortcuts, for instance.
There is no maximum limit for the duration of the pre-heating mode, i.e. it stays on
automatically when required.
If the hardware temperature is sufficient, the heating is not used even though the fuel
heater is on. In that case, only the fans are used.
The CPU fans are used in all heating modes when the outdoor temperate is over
-10 ºC. This temperature is also the limit value for starting up the parts inside the
central processing unit.
The display start-up temperature (inside temperature) is 0 ºC.
The need for power in the pre-heating mode depends on the ambient and hardware
temperature. The heaters are used at a rate of rise of +1 ºC per minute in order to
minimize power consumption and fast thermal expansion. The maximum power of the
system is less than 100 W (24V) when the heaters are on. The programmatically limited
maximum rate of rise in heating is +1 ºC, which limits power consumption. Pre-heating
thus consumes a maximum of 50 Wh (Wh – Watt hour) of electricity if pre-heating is
used for half an hour.
Pre-heating is always recommended when the outdoor temperature might be less than
0 ºC.
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