12
2 - Electrical connections
D
For mA, mV
Rj >10M
Ω
D1 With 2 wires transducer
D2 With 3 wires transducer
[1]
Auxiliary power supply for external
transmitter 18Vdc ±20% /30mA max.
without short circuit protection
external shunt
2.5
Ω
Transducer
18V–
9
5
6
PV
[1]
18V–
4…20mA
external shunt 2.5
Ω
Transducer
PV
9
5
6
[1]
mV mA
5
6
External
Shunt 2.5
Ω
2.3.2 PV CONTROL INPUT
B
2.3.3 AUXILIARY INPUT
(option)
B
For current transformer CT
Not isolated
For the measure of the load cur-
rent (see page 34)
• Primary coil 10A…100A
• Secondary coil 50mA default
100mA jumper selectable
18
17
10…100A
50/100mA
load
CT
~
5 watt burden resistor
0.5
Ω
for 1A secondary
transformer coil
0.1
Ω
for 5A secondary
transformer coil
Jumper for
100 mA
secondary
transformer coil
2.3.4 DIGITAL INPUT
(option) (page 37)
B
• The input is active when the
logic state is ON, correspond-
ing to the contact closed
• The input is inactive when the
logic state is OFF, correspond-
ing to the contact open
11
10
9
TTL
open
collector
NPN
open collector
Isolated
contact
Com.
IL 1
C1
M4UK.ed6 20-05-2005 11:43 Pagina 12
