Thermolec Application &Technical Notes Instrukcja Użytkownika Pobierz pdf (Strona 66)

THERMO-AIR & THERMO-ZONE

Graphic for proportional control

Proportional Control Diagram - Principle of the Pulse With Modulation

By comparing the input signal with an internally generated reference signal (triangle wave), the controller activates the SCR

output in a range of 0 to 100%.

On this graphic, every time the horizontal line corresponding to the input (in this example, 10 %, 50 % and 80 %), crosses

the reference signal, the heating elements are switched ON or OFF. The total heat output is an average between the ON

and OFF periods. For low heat demand, the heater is not "dimmed" but switched ON for very short periods.

Note: All Thermolec controllers are equipped with a zero-cross thyristor switching circuitry that virtually eliminates all

electro-magnetic interference (EMI) and radio frequency interference (RFI). The light emitting diode (LED) on the controller

indicates when the heating element is on.

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Thermolec Application &Technical Notes Instrukcja Użytkownika Strona 66