Sharp r-8580 Convection Cooking Condition, Automatic Mix Cooking Condition, Preheating Condition

CONVECTION COOKING CONDITION

PREHEATING CONDITION

Program desired convection temperature by touching the CONVECTION pad and the temp. pad.

When the START pad is touched, the following oper- ations occur:

1.The coil of shut-off relays (RY2, RY3 and RY5) are energized, the oven lamp, cooling fan motor, turntable motor and convection motor are turned

2.y:k coil of relay (RY6) is energized by the CPU unit, The damper is moved to the closed position, opening the damper switch contacts.

The opening of the damper switch contacts sends a signal to the LSI on the CPU unit de-energizing the relay (RY6) and opening the circuit to the damper motor.

3.The coil of heater relay (RY4) is energized by the CPU unit and the main supply voltage is added to the convection heater.

4.When the oven temperature reaches the selected preheat temperature, the following operations oc- cur:

4-l. The heater relay (RY4) is de-energized by

the CPU unit temperature circuit and thermistor, opening the circuit to the con- vection heater.

4-2. The oven will continue to function for 15 minutes, turning the convection heater on and off, as needed to maintain the selected preheat temperature.

The oven will shut-down completely after 15 minutes.

CONVECTION COOKING CONDITION

When the preheat temperature is reached, a beep signal will sound indicating that the holding temperature has been reached in the oven cavity. Open the door and place the food to be cooked in the oven.

Program desired cooking time and convection temper- ature by touching the NUMBER pad, CONVECTION pad and Temperature pad.

When the START pad is touched, the following oper- ations occur:

1. The numbers of the digital readout. start the count
down to zero.
2. The oven lamp,	turntable motor, cooling fan motor
and convection	motor are energized.

R -8580

5.At the end of the convection cook cycle, shut-off relay (RY6) is energized turning on- the damper motor. The damper is returned to the open position, closing the damper switch contacts which send a

signal to the control unit, de-energizing shut-off relay (RY6).

AUTOMATIC MIX COOKING CONDITION

Program desired cooking time and temperature by touching the number pads and the LOW MIX/BAKE or HIGH MIX/ROAST pad

When the START pad is touched, the following oper- ations occur:

1.The numbers of the digital readout start the count down to zero.

2.The shut-off relay (RY2, RY3 and RY5) are ener- gized, turning on the oven lamp, turntable motor, and cooling fan motor.

3.The shut-off relay (RY6) is energized.

The damper door is closed from the open position.

4.The heater relay (RY4) is energized, adding the mains supply voltage to the convection heater.

5.Now, the oven is in the convection cooking con- dition.

6.When the oven temperature reaches the selected temperature, the following operations occur:

6-l. The power supply voltages is added to the convection heater and power transformer al- ternately.

6-2. The convection heater operates through the heater relay (RY4) contacts and the power transformer operates through the cook relay (RYI ) contacts.

6-3. These are operated by the CPU unit to sup- ply alternately within a 32 second time base, convection heat and microwave energy.

The relationship between the convection and micro- wave power operations are as follows.

Note: The ON and OFF time ratio does not correspond with the percentage of microwave power, be- cause approx. 2 seconds are needed for heating of the magnetron filament.

3. Heater relay (RY4) is energized (if the cavity tem-
perature is lower than the selected temperature)
and the main supply voltage is applied to the con-
vection heater to return to the selected cooking
temperature.
4. Upon completion of the cooking time, the audible
signal will sound, and oven lamp, turntable motor,
cooling	fan motor and convection	motor are

I

MICROWAVE POWER

- Appmx. 10%

‘ON

CONVECTION TEMPERATURE

- leo°C

de-energized. At the end of the convection cycle,

if the cavity air temperature is above 118 OC., the

circuit to RY5 will be maintained (by the thermistor

circuit) to continue operation of the cooling fan

motor until the temperature drops below 118 OC.,

at which time the relay will be de-energized, turn-

ing off the fan motor. Relay RY3 will however,

open as soon as the convection cycle has ended,

turning off the convection fan motor.This will now

cool and allow the damper door to open.

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MICROWAVE POWER

- A6wrcuc30%.

			CONVECTION
ICONVECJ	OFF	&gjggg&	TEMPERATURE
			-200%
I		32~	i
r
		HIGH MIX
		-ROAST