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Product Facts
Issue: May 2009
Functional Description
The Power Select feature of specific Fujitsu Technology Solutions mainboards provides additional power supply
options for the system beyond the standard ATX power supply method. This is useful e.g. in industrial
applications where tough requirements exist concerning chassis and housing design; these requirements often
can't be met when using standard components for mainboard, power supply and housing.
The D2703-S is a Fujitsu Technology Solutions mainboard with Power Select; this board is used as an example
in the following sections to illustrate the technology.
Power Select offers three different power supply options:
• Standard ATX supply via onboard connector
• 24 V DC supply via onboard connector
• 24 V DC supply via external connector / AC adapter
Typical Application Fields for Power Select
Standard ATX power supply
• Industrial designs based on standard or open-frame ATX compliant power supplies
• Any designs that require enhanced power for additional components (high-current controllers, several hard
disk drives or optical drives, etc.)
24 V DC supply via onboard connector
• Industrial applications using an existing 24 V infrastructure
• Applications that require 24 V supply via lockable power supply connector
• Avoids need for expensive DC/DC-converters in applications that require SELV (= Safety Extra Low
Voltage) according IEC60950-1
24 V DC supply via external connector / AC adapter
• Enables small chassis design (no space for power supply required)
• Enables silent chassis designs (no effort for cooling of internal power supply)
• Best choice for small and low-power system design
• Enables design with reduced safety risk and effort by using approved AC adapter according IEC60950-1
Power Select Specifications
Important Note
• The internal power supply input (ATX connector) and external 24 V DC input shall under no circumstances
be operated simultaneously, as this will cause irreparable damage to the mainboard.
• If for any reason the power supply input is changed from internal to external or vice versa (e.g. for
evaluation tests), make sure to wait at least 5 minutes after disconnecting the internal power input and
connecting the external power input or vice versa. Otherwise, the remaining charge of onboard capacitors
may cause irreparable damage to the mainboard.
Any damage caused by misuse of the power supply inputs is excluded from the standard warranty. Fujitsu
Technology Solutions cannot be held liable for any damages that result from inappropriate use of the power
supply inputs.
Product: Power Select
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