Advantech TPC 51T 3BE Series, Руководство пользователя

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19 TPC-xx51T-x3BE User Manual
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2.6 Power/Digital Ground and Earth/Ground
This functions to block all the external electrical interference on the chassis, and pre -
vent any possibility of bad grounding resulting in electric shocks. This is level 1 isola -
tion, which consumer PCs do not normally implement.

TPC Chassis and Earth (Power pin3) are short.

TPC Chassis and Power / Digital GND are OPEN
The TPC is and industrial grade product, designed to prevent external interference
and the possibility of electric shock. To complete the isolation design, we need to
consider the following:

The Ethernet is isolated, a LAN connection will not impact the isolation design.

General USB devices are designed to solve EMI and ESD issues as a chassis
and digital short. The TPC prevents damage to USB devices, ESD, and EMI.
Solutions are designed to use Power GND as a vent path to ensure Power GND
and Chassis GND will not have potential difference abnormalities.

For different COM port designs, long distance connections can cause voltage
level differences between the two COM port chassis. Therefore the shell ground
of the cable must be isolated to the signal digital ground.
In application, many customers may break the level 1 isolation using a 3rd party
Device or cable design. In these circumstances, users need to consider making all
the GND short (Power GND/Digital GND/Earth GND), and ensure customers have
good earth/GND connection.
Note! Make sure all wires follow the installation guidelines or it may cause
issues.
Note!
If you install a USB device or Mini PCIe card on the TPC system, please
double check the voltage between V- and earth/ground, if the voltage is
not almost equal with each other, we suggest to short V- and earth/
ground the wiring.