10
2 - Electrical connections
2.3 EXAMPLE OF WIRING DIAGRAM
B
Fuse
2A
~T
6
Supervision
Supply
RS485
4…20mA
Fuse
[5]
Power
supply
switch
OP2
OP1
V
~
PTC [4]
18V
5
4
3
2
1
12
11
10
9
8
7
0P4
RX/TX
[6]
16
15
OP2
V
~
Retransmission
[3]
[6]
mV Tc
2.5 Ω
external
shunt
resistor
Pt100
2 wire transmitter
PV
mA
A
BB
Notes:
1] Make sure that the power supply
voltage is the same indicated on
the instrument.
2] Switch on the power supply only
after that all the electrical con-
nections have been completed.
3] In accordance with the safety reg-
ulations, the power supply switch
shall bring the identification of the
relevant instrument. The power
supply switch shall be easily
accessible from the operator.
4] The instrument is is PTC pro-
tected. In case of failure it is sug-
gested to return the instrument to
the manufacturer for repair.
5] To protect the instrument internal
circuits use:
- 2 AT/250Vac (4AT/120Vac)
fuses for Relay outputs
- 1 A
~ T fuses for Triac outputs
6] Relay contacts are already pro-
tected with varistors.
Only in case of 24 Vac inductive
loads, use model A51-065-30D7
varistors (on request)
M1UK.ed5 14-05-2009 14:56 Pagina 10
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