Klark Teknik QFLEX Manual Del Usuario página 24

46
QFLEX ISOLATOR
Introduction
ISOLATOR has been designed to ease the
problems often presented when large VNET
systems are constructed. Specifically it
addresses the following issues :
• • The possibility that mains earth potentials
exceeding +/-15V exists between different
network nodes
• • Large amounts of electrical noise and
interference may be present on the
network cables
• • Wiring faults on the network cable
damaging other network nodes
• • It is desired to create networks that have a
large "star" topology
• • It is desired to use screw terminal
terminated wiring to construct the network
• • It is desired to be able to install and test
the main "backbone" network cable
without the presence of other equipment
(including ISOLATORS)
As its name implies ISOLATOR limits these
problems by making it possible to galvanically
isolate different parts of the network from
each other and from the controlling computer
system. When any of the above situations
can be anticipated then ISOLATORS should be
incorporated in to the design of the network.
For systems which incorporate AES3 over VNET
(VNET2), please contact you vendor for details
of how to set the internal jumpers inside the
Isolator. Please be aware that some of the
application examples shown in this document
are not applicable to VNET2 systems.
Mounting
ISOLATOR is housed in a strong galvanised
steel case that can be mounted using 4 mm
diameter hardware in the holes that are on
40 x 92.5 mm centres. If dust or moisture
resistance is required then it will be necessary
to mount ISOLATOR in a suitable enclosure.
Note that the case of ISOLATOR is connected
to the earth system on the LINK side of the
isolation barrier.
47
Quick Start Guide