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5.2.
Heating control and current (CT) application
A 850 controller (model 850–D-R00-00100-1) controls a
heating element via a solid-state relay connected to a logic
output.
A TC sensor measures the temforature.
Each branch of the circuit is protected by a fuse.
The alarm relay is protected by a snubber.
A current transformer is connected to a dedicated input to
indirectly measure electrical consumption.
The following diagram shows the various connections.
One switch can control more than one controller.
5.2.1.
Connection diagram
L
Controller
fuse
N
Fuse alarm
relay
19
Snubber
20
21
Alarm
relay
22
23
24
80209C_MHW_850-1650-1850_01-2020_ENG_pag. 195
With Quick Configuration you set:
•
sensor type (TC);
•
unit of measurement of temforature (°C);
•
the logic output function (HEAT);
•
the relay output function (ALRM1);
•
the full-scale value of the CT1 current transformer
(HI.CT1)
•
the setpoint, i.e. the temforature to be maintained
(SETP);
•
the temforature value that trips the alarm (ALRM1).
Heating element
7
6
8
5
9
4
10
3
11
2
12
1
850 Controller
fuse
Solid state
relay
+
Heating
element
-
T/C
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