Elgas DATCOM, Operating Instructions Manual

Page: 62 / 228

5
Installation and Commissioning
60
If remote communication with the corrector via a cable line (RS485 interface, Ethernet, etc.)
is used it is advisable to use overvoltage protection also for this connection.
As an integral part of overvoltage protection, a protective connection must be made in the
control station (generally at the installation site), which is connected to the main protective
terminal block, to which the PE protective conductor of the supply cable and the grounding of
the building (and possibly other conductive technical wiring are connected) inside the
building - gas, water, heating, air conditioning, etc.).
Note – ELCORplus for Zone 2
If the device is powered from the S4N-PWR3 module, it is powered directly from 230Vac. In
this case, SPD type 3 in a design designed for mains sockets can be used or a mains socket
with an integrated SPD type 3 can be used.
5.5.2.2 Grounding and bonding
The inlet and outlet of the gas pipe to/from the control station must be galvanically separated
from the pipe located inside the control station in order to prevent the flow of balancing
currents through the pipes, which can be a source of interference.
Insulated pipe inside the control station must be perfectly grounded and its individual
components including the gas meter must be perfectly concatenated. In between the
individual parts have not arisen voltage potential which would cause flow disturbance
compensating currents (Fig. 18).
Fig. 18 interconnection pipelines
5.5.2.3 Device grounding
The device (corrector ELCOR, ELCORplus, ELCORplus corrector for zone 2 and the
DATCOM, DATCOMplus, DATCOMplus recorder for Zone 2) does not have to be grounded
from a functional point of view.
In the case of a device with an internal pressure sensor, the device is grounded (connected
to the pipeline) via a pressure sensor housing and a Ø 6mm gas supply pipe from the
pipeline (so-called impulse tube) screwed to it – see Fig. 19.
NOTICE
If the main supply is the absence of surge protectors or their incorrect
connection, the manufacturer of the corrector/recorder cannot guarantee its
correct function.