Type / N°
Rev.
Fw
Date
Page
Total pages
EW055.600D
D
4L
6
th
June 2018
35
43
EsiWelma
®
s.r.l.
7. ELECTRICAL CONNECTIONS
7.1.
Low voltage connections
Usually all the performed controls with micro switches and buttons are normally open and
must close on 0V when used. Particularly:
Start contact
open in stand-by, closed during delivering
High pressure contact
N.O. o N.C. modifiable through set-up
Predetermination buttons
normally open, closed when activated
Foreseen mass flow meter:
Impulsive type:
Current per channel:
50mA
Output:
active low
Impulses:
100 x Kg/Smc
Serial type:
Power supply tension:
5V, 12V, 24V
Power sup. curr.(MAX): 200mA, 100mA, 50mA
Serial line
RS485 Standard ModBus
Terminal Board TB1
See Warning
WARNING:
The below reported electrical connection
schemes do not absolve the installer from
respecting the standards of the country where
the installation is going to be performed, and
the respect of the foreseen security standards
for the type and the characteristics of the
application, specially in the context of electrical
constructions
in
potentially
explosive
atmospheres.
Protection systems (e.g. zener barriers) are
significant because their use depends on the
type of dispenser and on the classification of all
the areas which make up the dispenser itself.
2 0V Field
1
Aut/Man
3 Rx
4 Tx
5 not Used
TB1
TB4
TB1
Display Link
Power Links
Field
Link
s
TB8
TB7
TB6
TB5
TB3
TB2
1
2
