11
2 - Electrical connections
2.3.1 POWER SUPPLY
B
Switching power supply with mul-
tiple isolation and internal PTC
• Standard version:
nominal voltage:
100...240Vac (-15...+10%)
Frequency 50/60Hz
• Low Voltage version:
Nominal voltage:
24Vac (-25...+12%)
Frequency 50/60Hz or
24Vdc (-15...+25%)
• Power consumption 2.6W max.
L
N
1
2
Included
PTC
Supply
2.3.2 PV CONTROL INPUT
B
A For L-J-K-S-T thermocouple type
• Connect the wires with the
polarity as shown
• Use always compensation cable
of the correct type for the ther-
mocouple used
• The shield, if present, must be
connected to a proper earth.
B For Pt100 resistance
thermometer
• If a 3 wires system is used, use
always cables of the same diam-
eter (1mm
2
min.) (line 20
Ω
/lead
maximum resistance)
• When using a 2 wires system, use
always cables of the same diam-
eter (1.5mm
2
min.) and put a
jumper between terminals 5 and 6
C For
∆
T (2x RTD Pt100)
Special
A
When the distance between
the controller and the sensor is
15 m. using a cable of 1.5 mm
2
diameter, produces an error on
the measure of 1°C (1°F).
R1 + R2 must be <320
Ω
Wire resistance
150
Ω
max.
For 3 wires only
Maximum
resistance/line 20
Ω
Use wires of the
same length and
1.5 mm
2
size.
Maximum resis-
tance/line 20
Ω
5
6
12
A
B
A
R1
R2
5
6
12
B
b
A
5
6
M4UK.ed6 20-05-2005 11:43 Pagina 11
