Electrolux EI27MO45GSA, Technical & Service Manual

Page: 15 / 52

Operation
2-3
Variable Cooking
When Variable Cooking Power is programmed, 120 volts
AC is supplied to the power transformer intermittently
through the contacts of relay (RY-2) and is operated by
the control unit within a 32 second time base. Microwave
power operation is as follows:
Vari-Mode ON TIME OFF TIME
Power 10 (High) (100% Power) 32 sec. 0 sec.
Power 9 (P-90) (Approx. 90%) 30 sec. 2 sec.
Power 8 (P-80) (Approx. 80%) 26 sec. 6 sec.
Power 7 (P-70) (Approx. 70%) 24 sec. 8 sec.
Power 6 (P-60) (Approx. 60%) 22 sec. 10 sec.
Power 5 (P-50) (Approx. 50%) 18 sec. 14 sec.
Power 4 (P-40) (Approx. 40%) 16 sec. 16 sec.
Power 3 (P-30) (Approx. 30%) 12 sec. 20 sec.
Power 2 (P-20) (Approx. 20%) 8 sec. 24 sec.
Power 1 (P-10) (Approx. 10%) 6 sec. 26 sec.
Power 0 (P-0) (0% power) 0 sec. 32 sec.
The ON/OFF time ratio does not correspond with
the percentage of microwave power, because
approx. 2 seconds are needed for heating of the
magnetron filament.
SENSOR COOKING CONDITION
Using the SENSOR COOK function, the foods are
cooked without figuring time, power level or quantity.
When the oven senses enough steam from the food, it
relays the information to its microprocessor which will
calculate the remaining cooking time and power level
needed for best results.
When food is cooked, water vapor is developed. The
sensor “senses” the vapor and its resistance increases
gradually. When the resistance reaches the value set
according to the menu, supplementary cooking is started.
The time of supplementary cooking is determined by
experiment with each food category and inputted into the
LSI.
An example of how the sensor works:
(BAKED POTATOES)
1. Potatoes at room temperature. Vapor is emitted
very slowly.
2. Heat Potatoes. Moisture and humidity is emitted
rapidly. You can smell the aroma as it cooks.
3. Sensor detects moisture and humidity and
calculates cooking time and variable power.
COOKING SEQUENCE
1. Touch SENSOR COOK pad.
NOTE: The oven should not be operated on SENSOR
immediately after plugging in the unit. Wait two minutes
before cooking on SENSOR.
2. Select desired Sensor setting.
3. Touch START pad.
The coil of shut-off relay (RY1, RY6) is energized, the
oven lamp and cooling fan motor are turned on, but
the power transformer is not turned on.
4. After about 16 seconds, the cook relay (RY2) is
energized. The power transformer is turned on,
microwave energy is produced and first stage is
started. The 16 seconds is the cooling time required
to remove any vapor from the oven cavity and sensor.
NOTE: During this first stage, do not open the door or
touch STOP/CLEAR pad.
5. When the sensor detects the vapor emitted from the
food, the display switches over to the remaining
cooking time and the timer counts down to zero. At
this time, the door may be opened to stir, turn, or
season food.
6. When the timer reaches zero, an audible signal
sounds. The shut-off relay and cook relay are
de-energized and the power transformer, oven lamp,
etc. are turned off.
7. Opening the door or touching the STOP/CLEAR pad,
the time of day will reappear on the display and the
oven will revert to an OFF condition.
MICROWAVE
MICROWAVE
AH SENSOR