I-Data POLARIS Panel PC 19.1" - Manual (Page 20)

User manual
POLARIS Panel PC 19.1'' and Panel PC 15''
Version 2.00
Page 20 of 46
E_BMS790_POLARIS_PanelPC_19+15_Rev1.doc • User manual for POLARIS Panel PC 19.1" and 15" • Revision 1 / Status: January, 3 rd , 2006 • Technical data subject to change
Connection of shielding at one end only of the cables linking the controller and Panel PC:
Connection of the shielding at one end only is recommended when there is inadequate equipotential bonding, or none at all.
In such cases an electrically isolated power supply unit must be used.
If the shielding were connected at both ends, the equipotential bonding current would flow to point A and this must be
avoided at all costs, as the resultant interference pulses could be passed on to the devices via the data cable. When
shielding is connected at one end only it must be on the side that has the lowest resistance earth connection.
Before the equipment goes into service the directions from the controller manufacturer regarding proper assembly and
operation must be read carefully. They should then be applied taking full account of the recommendations we make here.
3.3.6 Connection of Ethernet cable to POLARIS Panel PCs
Shielding
Controller
Difference in potential
Earth
POLARIS
Panel PC