405.1200.037.2 - Rel.: 2.21 of 25/02/2008
2-3
Beware of appliances with the POSITIVE connected to PE.
It is vital that the earth of the devices connected to the serial
and/or parallel communication ports have the same voltage as the
0V supply of the VT. The circulation of current between the 0V supply
and the earth of the communication ports could damage certain com-
ponents of the VT or of the devices connected it.
Recommended
connection
We recommend a wiring scheme as set out below in the interests of avoid-
ing damaging the VT.
Correct earthing is essential.
Table 2.3: Power supply with 0Vdc connected to PE
~
+-
24V
3
+24V
PE
0V
VT
PLC
PE
N
L1
4
1
2
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