SMART Embedded Computing 6806800V18A, Installation And Use Manual

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Site Preparation
AXP1440-C07 Installation and Use (6806800V18A) 83
To guarantee proper blade operation, make sure that the temperatures at the locations
specified in the following table are not exceeded. If not stated otherwise, the temperatures
should be measured by placing a sensor exactly at the given locations.
3.2.3.2 Power Requirements
Make sure that a suitable -48VDC power source is within reach of the shelf. Two PEMs can
be installed in the shelf. The shelf may require up to 125A DC through two 80A feeds. The
required cable size for 80A is 4 AWG wire.
Table 3-2 Critical Temperature Limits
Component Temperature Limit
Air inlet (shelf front) +55°C (131°F)
Air outlet (shelf rear) +70°C (158°F)
Power entry module lug-plastic washer
+70°C (158°F)
>+70°C (158°F) and m90°C (194 °F): the
cables must be isolated and must be approved to be
used in this temperature range.
>+70°C (158°F) and m90° (194°F): the
service personnel may touch the components: the
cables must be isolated and the hot surface icon
must be attached. The cables must be approved to
be used in this temperature range.
Table 3-3 System Power Requirements
Feature Value
Rated voltage input current
-48VDC (SELV)
-60VDC to -72VDC (TNV-2)
80A (X2)
Operating voltage range -40 to -72VDC
Personal or System Damage
The shelf may be supplied by a TNV-2 voltage. This voltage is considered hazardous.
Make sure that the power supply unit meets the local safety standards.