Bartec POLARIS II PROFESSIONAL, Руководство пользователя

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Technical Data
POLARIS PROFESSIONAL
POLARIS II Panel PC
28/45
Technical data subject to change without notice.
07/2018
As a result of the connection of the power supply to the POLARIS, the earth for the
power supply is connected to the PE. It is essential to ensure that the earth for the power
supply on the POLARIS, if this is not electrically isolated, indicates no potential
difference to the PE/PA.
6.5.3 Back-up fuse
We recommend protecting the POLARIS with an upstream fuse to prevent blowing the
fuse inside the device. Only BARTEC can change the internal fuse.
Upstream fuse for AC: 5 AT
DC: 5 AT
6.5.4 Interference suppression
Certain basic measures must be taken to ensure freedom from interference when the
POLARIS are installed:

The interference voltages coupled into the device via power, data and signal line and
the electrostatic voltage caused by contact are to be dissipated through the
equipotential bonding.

The installation point should be as far as possible away from fields of electromagnetic
interference. This is especially important if there are frequency converters in the
vicinity. Under certain circumstances will it be advisable to set up partitions to isolate
the graphic display from interference.

If inductive devices are fitted in the vicinity (e.g. contactor, relay or solenoid coils),
especially if they are powered from the same source, protective circuits (e.g. RC
elements) must be installed.

Power supply and data cables must be laid so as to avoid interference. This can be
achieved, for example, by avoiding laying such cables in close proximity to high-current
carrying cables.
6.5.5 Shielding

Only cables with braided shielding should be used
(recommended cover density > 80%).

Sheet shielding should not be used.

Generally, connection of the shielding at both ends results in optimum damping of all
interference frequencies.

Connection of the shielding at one side only may be more advisable if a difference in
potential exists and no equipotential bonding cable can be laid.
6.5.6 Connection of shielding
A low impedance connection to the circuit protective conductor is important to ensure a low
current fault path.
When sub-D connectors are used, the shielding should always be connected to the metal
casing of the sub-D plug.