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.
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).
5.2.1. Connection diagram
L
Controller fuse
Snubber
Alarm relay
Fuse alarm relay
19
20
21
22
23
24
10
11
12
7
8
9
850 Controller
3
2
1
6
5
4
Heating element fuse
+
-
T/C
Solid state relay
Heating element
N
80290E_MHW_850-1650-1850_06-2021_ITA_pag. 200
5.2.2. Quick configuration procedure for model 850–D-R00-00000-1
Home
> 2 s
> 2 s
> 2 s
> 2 s
> 2 s
> 2 s
> 2 s
Selecting sensor type
Selecting unit of measurement
The unit of measurement can be °C or °F only if a TC or Rtd sensor is selected
Select output 1 function
The functions proposed are based on type of logic output.
Select output 2 function
The functions proposed are based on type of logic output.
raises the value lowers the value
Full-scale of the CT1 current transformer raises the value lowers the value
Setting Setpoint raises the value lowers the value
Setting Alarm 1
Default: direct maximum absolute
Enable/disable quick configuration return to select sensory type
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