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Explanation of the Auto Sensor Cooking process
1. During the first 10 second period there is no microwave
activity. When calculating the T2 time by using the
formula below make sure this 10 seconds is subtracted
from the T1 time. In other words, T1 time starts at the
end of the 10 second period.
formula below make sure this 10 seconds is subtracted
from the T1 time. In other words, T1 time starts at the
end of the 10 second period.
2. T1 time The total amount of time it takes the microwave
oven to switch to T2 time after the 10second period.
3. T2 time When the steam escapes from the cooking
container placed in the oven, the steam sensor detects
it and the microprocessor calculates the balance of
cooking time. This T2 time is then shown in the display
and begins counting down.
Balance of cooking time (T2 time)
The balance of cooking time which is called T2 time,
can be calculated by the following formula.
T2 time (in sec.) = T1 time X K factor
it and the microprocessor calculates the balance of
cooking time. This T2 time is then shown in the display
and begins counting down.
Balance of cooking time (T2 time)
The balance of cooking time which is called T2 time,
can be calculated by the following formula.
T2 time (in sec.) = T1 time X K factor
NOTE:
Remember, the T1 time starts after the 10 second
period. The coefficient K is programmed into the
microprocessor memory and they are listed in the
following tables along with the P1 and P2 powers.
period. The coefficient K is programmed into the
microprocessor memory and they are listed in the
following tables along with the P1 and P2 powers.
NOTE:
When "More" or "Less" pad is selected, the K factor
varies resulting in T2 time to be increased or decreased.
varies resulting in T2 time to be increased or decreased.
Example of calculating the T2 time
Example 1: If the T1 time is measured to be 2 minutes and
40 seconds after the 10 second period.
T2 = T1 × K ± 10 sec.
= 2 min. and 40 sec. × 0.1 ± 10 sec.
= 16 sec. ± 10 sec.
= ± 10 sec.
40 seconds after the 10 second period.
T2 = T1 × K ± 10 sec.
= 2 min. and 40 sec. × 0.1 ± 10 sec.
= 16 sec. ± 10 sec.
= ± 10 sec.
CATEGORY
P1
POWER
P2
POWER
K FACTOR
STANDARD
SENSOR
REHEAT
MEDIUM
POWER
LOW
POWER
0
2.5. Steam sensor and digital
programmer circuit
In order to determine if the steam sensor function of the digital
programmer circuit is working, do the following test.
1. Place a water load (100 cc) in the oven.
2. Tap Sensor Reheat pad.
3. Tap Start pad.
4. Steam Sensor detects steam about 1.5 to 2 minutes after
programmer circuit is working, do the following test.
1. Place a water load (100 cc) in the oven.
2. Tap Sensor Reheat pad.
3. Tap Start pad.
4. Steam Sensor detects steam about 1.5 to 2 minutes after
the Start pad is tapped.
5. T1 time cooking automatically switches to remaining time
for cooking (T2).
6. The remaining cooking time (T2) appears in display
window. If the following cooking time appears, Steam
Sensor function is normal.
Sensor function is normal.
T1 TIME
T2 TIME (Remainingcooking time)
50 Sec. ~ 2 Min.
0 Sec. ~ 24 Sec.
2.6. Grill cooking control
Grill cooking is accomplished by upper heaters only. One grill
cooking cycle is 33 seconds.
1. During grill cooking, the digital programmer circuit controls
cooking cycle is 33 seconds.
1. During grill cooking, the digital programmer circuit controls
power relay RY4´s ON-OFF time. In all three grill cooking
categories, power relay RY1 always stay ON, but RY4´s
ON-OFF time are shown in Figure.
categories, power relay RY1 always stay ON, but RY4´s
ON-OFF time are shown in Figure.
GRILL
CATEGORY
GRILL (RY4)
MICROWAVE (DUTY)
ON (sec.)
OFF (sec.)
ON (sec.)
OFF (sec.)
1
33
0
2
24
9
0
33
3
18
15
2.7. Combination Cooking
Combination cooking is accomplished by microwave and grill
cooking (upper heaters) being done synchronously during one
combination cooking cycle. One combination cooking cycle is
33 seconds.
1. During combination cooking, the digital programmer circuit
cooking (upper heaters) being done synchronously during one
combination cooking cycle. One combination cooking cycle is
33 seconds.
1. During combination cooking, the digital programmer circuit
controls power relay RY4 & RY1´s duty ON-OFF time. In all
three combination cooking categories, power relay RY4 &
RY1’s duty ON-OFF time are as shown in Figure.
three combination cooking categories, power relay RY4 &
RY1’s duty ON-OFF time are as shown in Figure.
COMBINATION
CATEGORY
GRILL(RY4)
MICROWAVE(DUTY)
ON(sec.)
OFF(sec.)
ON(sec.)
OFF(sec.)
1
33
0
33
0
2
24
9
33
0
3
16
17
23
10
2.8. Oven cooking control
The digital programmer circuit controls the ON-OFF time of the
heater in order to control oven cavity temperature.
1. After selecting desired oven cavity temperature of oven (the
heater in order to control oven cavity temperature.
1. After selecting desired oven cavity temperature of oven (the
range of selected oven temp is 100°C-220°C) and pressing
[Start] pad, a high level signal comes out of the micro
computer and applies to power relays, RY4 & RY6.
[Start] pad, a high level signal comes out of the micro
computer and applies to power relays, RY4 & RY6.
2. When RY4 & RY6 are switched to ON, power source
voltage is applied to the upper heater & lower heater, and
the heaters turn on.
the heaters turn on.
3. The digital programmer circuit senses the oven cavity
temperature through oven temp sensor (thermistor). When
the oven temperature reaches the set temperature, DPC
stops supplying high level signal to the power relays, and
the heaters turn off.
the oven temperature reaches the set temperature, DPC
stops supplying high level signal to the power relays, and
the heaters turn off.
4. After the upper heater and lower heater turn off, the oven
temperature will continue increasing for a while and then
decrease as shown in Figure.
When the oven temperature drops below the set
temperature, the digital programmer circuit senses the
signal and starts supplying a high level signal to RY4 & RY6
again.
decrease as shown in Figure.
When the oven temperature drops below the set
temperature, the digital programmer circuit senses the
signal and starts supplying a high level signal to RY4 & RY6
again.
7
NN-DF383B
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