Lincoln Impinger Conveyor Ovens 1633-000-EA, Service Manual

Page: 4 / 32

Low Profile – 1600 Advantage Series Service Manual – International 4
Adjustments of the speed control potentiometer will change resistance at terminals P1 and P2 varying the DC
voltage to the motor. The speed of the conveyor motor will increase or decrease as the DC voltage from the board
increases or decreases respectively.
NOTE: The conveyor control uses a sensor and magnet, mounted on the conveyor motor that senses motor
speed. Any change in motor load (
±
RPM ) is detected by the sensor and the voltage to the motor is adjusted
accordingly.
TEMPERATURE DISPLAY
Closing the power switch supplies line voltage to the primary of the temperature display transformer. The
secondary of this transformer supplies 12 VAC to the temperature display. The thermocouple supplies DC
millivolts to the temperature display. The display converts this millivolt reading to a temperature reading.