Control System
This section contains information about the following components:
-Control board
-Display
-Electrical compartment cooling fans
-Electrical compartment cooling fan thermostat
-Electrical compartment thermocouple
-EMI Filter
-Fuses
-
-Keypad
-Magnetron cooling fans
-Magnetron thermostats
-Power Supply
-Relay (K1 - Filament)
-Relay (K2 - Anode)
-Relay (K3 - Monitor)
-Relay (K6 - Voltage)
-Relay (K7 - Mag fan)
-Relay (K8 - Stirrer)
-RTD
-Smart card reader
-Solid state relay (K4/K5 - Heater)
-Speaker
-USB port
-Voltage sensor
-Wire harness
Control Board
The control board controls each electrical compo- nent of the oven. See page 51 for a schematic. 24 VDC can be measured at pin 2 of the J7 connector.
Display
The vacuum fluorescent display is the primary user interface.
Electrical Compartment Cooling Fans
The cooling fans (located in the rear of the oven) are actuated by the cooling fan thermostat when the temperature of the electrical compartment
Electrical Compartment Cooling Fan Thermostat
The cooling fan thermostat actuates the rear cooling fans when the electrical compartment temperature reaches 120ºF (49ºC).
Electrical Compartment Thermocouple
The electrical compartment thermocouple is a type “K” thermocouple, which measures the temperature of the electrical compartment. If the temperature of the electrical compartment is above 158ºF (70ºC), an F6: EC TEMP” fault will display. The control board checks the temperature of the electrical compartment once every 60 seconds.
EMI Filter
The EMI filter helps suppress the amount of RF interference emitted by the oven.
Fuses
All four fuses are
The F1 fuse (via blue wire) or F2 fuse (via brown wire) is designed to blow in case of an
-BMSC motor controller
-Electrical compartment cooling fans
-Filament transformers
-Magnetron cooling fans
-Power supply
-Stirrer motor
The F3 fuse is designed to blow in case of an over- current situation relative to the left microwave system (magnetron,
The F4 fuse is designed to blow in case of an over- current situation relative to the right microwave system (magnetron,
33
OVEN SYSTEMS
reaches 120ºF (49ºC).