13
3 - Electrical Connections
3.3.1 POWER SUPPLY
B
Switching power supply with mul-
tiple isolation and PTC protection.
• 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 5W max.
3.3.2 PV CONTROL INPUT
B
A L-J-K-S-R-T-B-N-E-W thermocouple type
• Connect wires with the polarity as shown;
• Always use compensation cable of the correct type
for the thermocouple used;
• The shield, if present, must be connected to ground.
B For Pt100 resistance thermometer
• If a 3 wires system is used, always use cables of the
same section (1mm
2
min.), maximum line resistance
20 Ω/line.
• When using a 2 wires system, always use cables of the
same section (1.5mm
2
min.) and put a jumper between
terminals 11 and 12
C For ∆T (2x RTD Pt100) Special
A When the distance between the controller and the
sensor is 15m, using a cable of 1.5mm
2
section, pro-
duces an error on the measure of 1°C.
R1 + R2 must be <320Ω
Wire resistance
150Ω max.
Only for two wires
system, put a
jumper between ter-
minals 11 and 12.
Use wires of the
same length and 1.5
mm
2
size.
Maximum line resis-
tance 20 Ω/line.
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