80209C_MHW_850-1650-1850_01-2020_ENG_pag. 195
5.2. Heating control and current (CT) application
5.2.1. Connection diagram
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19
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+
-
T/C
Heating element
fuse
Solid state
relay
Heating
element
Fuse alarm
relay
Controller
fuse
Alarm
relay
850 Controller
Snubber
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).
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