Fieldbus Valve Coupler FD0-VC-Ex4.FF
Installation
22
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
Fuchs Group • Tel.: G49 621 776-0 • USA +1 330 4253555 • Sin65 67799091 • Internet http://www.pepperl-fuchs.com
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Figure 5.5: Connection of PFCs and additional polarised diodes
5.4.4
EMC, screening, grounding
Cables are screened to exclude electro-magnetical interference.
The device is provided with an equipotential bonding terminal (PA) which is connected with the grounding
plate of the right housing mounting bore inside the device. Preferably, the device should be grounded di-
rectly via the grounding plate during installation (see note in section 5.3). Large metallic objects with a pro-
per galvanic ground connection are suitable, e.g. switch cabinets, tower shelf columns, etc.
Connect the screen of the bus cable to the terminal (S) of the valve coupler.
Preferably do not use screened cables for the connecting leads between the valve coupler and the valve
and PFC.
5.5
Dismantling, packing and disposal
When dismantling the device, keep it in the original packaging for future use.
To use mechanical contacts as valve final position feedbacks, use a "Field Terminal Block" from
Fuchs or two polarised diodes to be able to make use of the 2:1 procedure.
If mechanical contacts are used as valve final position feedbacks, also the lead breakage and
short-circuit monitoring system can be used after adding an additional serial and parallel resistor
in the lead.
The following is required:
one 1 k
Ω
series resistance (for monitoring short-circuit),
one 10 k
Ω
parallel resistance (for lead-breakage monitoring).
When using a double-screened bus cable, e.g. wire braided and metallised foil, connect both
screens with each other low-resistively at the line end when preparing the cables.
Power supply cables generate quite a number of interferences, e.g. inrush current of a three-
phase electric motor. Thus avoid parallel routing of supply cables and data/signal cables in the
same cable duct.
The valve coupler should be disposed of according to the national specifications or subject to
recycling procedures.
The device does not contain batteries which would have to be disposed of separately.
Sensors with integrated
polarised diode
Sensors without integrated
polarised diode
Mechanical switches
3
4
3
4
3
4
PFC B
PFC A
PFC B
PFC A
PFC B
PFC A
