2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
2.5-4
General description of the infrared cell temperature regulation:
This system consists mainly of the following components:
The temperature sensor
The temperature control board TH 61
The power stage board NR 32
The heating elements
The temperature sensor feels the temperature of the infrared system, and sends the
signal to the temperature control board TH 61.
The TH 61 compares this signal with a set point value. The resulting value drives a pulse
width modulator. The LED of this board shows the function of the modulator.
The modulated signal further drives and power stage of the NR 32 board; the power
signal returns to the TH 61 board, from there it finally goes to the heater elements.
J2/10
J2/ 9
J1/7
+
Set point
Temperature
sensor
PWM
J1/6
J1/4
J1/5
+
+
+
J1/3
J2/3 J1/4J2/4
J1/3
J1/2
2-5-4
Heating elements
J2/1 J1/2J2/2
J1/6
J1/7
TH 62
NR 32
J1/1
230V AC
200V DC
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