SEQUENCE OF OPERATIONS
MODEL | 400/230 VAC | 50 HZ. | 3 PHASE |
POWER SUPPLY
Electrical power to be supplied to the oven by a four conductor service.
Brown conductor is Hot.
Black conductor is Hot.
Black conductor is Hot.
Green conductor is ground.
CONTROL BOX AUTO COOL DOWN
When the temperature in the control box reaches 120° F, ± 3° (48.9°C, ± 1.7°C), the cooling fan thermostat will switch power to the control box cooling fan. The thermostat will interrupt power to the cooling fan when the control
box temperature falls to 100° F, ± 3° (37.8°C, ± 1.7°C).
MAIN FAN CIRCUIT
Power is permanently supplied through the normally closed oven cavity
HEAT CIRCUIT
Closing the oven fan switch supplies 230VAC, through the normally open air pressure switch (closed by air pressure from the main fan) to the electronic temperature control. The 1K ohm temperature potentiometer is adjusted to desired temperature. The thermocouple will provide varying millivolts to the temperature control. The temperature control then supplies 230 VAC to the coil of the contactor at intermittent intervals to maintain the desired temperature. The heat lamp is energized with the contactor.
CONVEYOR DRIVE
Closing the oven fan switch supplies 230 VAC through the EMI filter to the motor control board. AC volts are converted to DC volts and are supplied to the conveyor motor at terminals A+ and
NOTE: The conveyor control uses a sensor and magnet, mounted on the conveyor motor, that senses the 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 main fan switch supplies 230 VAC 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.
Impinger II – | 3 |