Panasonic NN-DS592MZPE Service Manual ▷ View online
1 FEATURE CHART
2 CONTROL PANEL
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NN-DS592M
3 SCHEMATIC DIAGRAM
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NN-DS592M
4.1. Variable power cooking
control
High Voltage Inverter Power Supply (U) controls output power
by the signal from Digital Programmer Circuit (DPC). Power
relay always stays ON, but PWM (pulse width modulation)
signal controls microwave output power.
NOTE:
by the signal from Digital Programmer Circuit (DPC). Power
relay always stays ON, but PWM (pulse width modulation)
signal controls microwave output power.
NOTE:
The ON/OFF time ratio does not correspond with the
percentage of microwave power since approximately 2
seconds are required for heating of magnetron
filament.
percentage of microwave power since approximately 2
seconds are required for heating of magnetron
filament.
Variable Power Cooking
POWER SETTING
OUTPUT
POWER(%)
APPROX.
MANUAL MICROWAVE
DUTY
ON(SEC)
OFF(SEC)
HIGH
100%
22
0
MEDIUM-HIGH
80%
22
0
MEDIUM
60%
22
0
MEDIUM-LOW
40%
22
0
DEFROST
30%
22
0
LOW
20%
13
9
4.2. Inverter power supply circuit
The Inverter Power Supply circuit powered from the line
voltage, 220V 50Hz AC input supplies 4,000V DC to the
magnetron tube, and functions in place of the H.V. transformer,
the H.V. capacitor and H.V. diode.
1. The AC input voltage 220V 50Hz is rectified to DC voltage
voltage, 220V 50Hz AC input supplies 4,000V DC to the
magnetron tube, and functions in place of the H.V. transformer,
the H.V. capacitor and H.V. diode.
1. The AC input voltage 220V 50Hz is rectified to DC voltage
immediately.
2. DC voltage will be supplied to the switching devices called
IGBT. These devices are switched ON-OFF by the 20 to 40
KHz PWM (pulse width modulation) signal from the
microcomputer in the DPC.
KHz PWM (pulse width modulation) signal from the
microcomputer in the DPC.
3. This drives the High voltage transformer to increase voltage
up to 2,000V AC.
4. Then the half-wave doubler voltage rectifier circuit,
consisting of the H.V. diodes and capacitors, generates the
necessary 4,000V DC needed for the magnetron.
necessary 4,000V DC needed for the magnetron.
5. Output power of the magnetron tube is always monitored by
the signal output from the current transformer built into the
inverter circuit.
inverter circuit.
6. This signal is fed back to the microcomputer in the DPC to
determine operating conditions and output necessary to
control PWM signal to the Inverter Power Supply for control
of the output power.
control PWM signal to the Inverter Power Supply for control
of the output power.
4.3. Steam defrost, Auto cook &
Steam reheat
When the Auto Control feature is selected and the [Start] pad
is tapped:
1. The digital programer circuit determines the power level and
is tapped:
1. The digital programer circuit determines the power level and
cooking time to complete cooking and indicates the
operating state in the display window. Table shows the
corresponding cooking times for respective serving by
categories.
operating state in the display window. Table shows the
corresponding cooking times for respective serving by
categories.
Steam Defrost
SELECTED WEIGHT
COOKING TIME
1.0 kg
15 min.20 sec.
Auto Cook (Vegetable)
SELECTED WEIGHT
COOKING TIME
200 g
4 min.30 sec.
2. When cooking time in the display window has elapsed, the
oven turns off automatically by a control signal from the
digital programmer circuit.
digital programmer circuit.
4.4. 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, RY3, RY4 & RY5.
[Start] pad, a high level signal comes out of the micro
computer and applies to power relays, RY3, RY4 & RY5.
2. When RY3, RY4 & RY5 are switched to ON, power source
voltage is applied to the upper heater & lower heater, and
the heaters turn on.
NOTE:
the heaters turn on.
NOTE:
Upper heaters & lower heater work alternately. When
two upper heaters work, lower heater would not work.
Whereas if two upper heaters do not work, the lower
heater works. During the preheat phase (before oven
temperature reaches the set temperature), the cooking
cycle is 35 seconds.
two upper heaters work, lower heater would not work.
Whereas if two upper heaters do not work, the lower
heater works. During the preheat phase (before oven
temperature reaches the set temperature), the cooking
cycle is 35 seconds.
UPPER HEATER
LOWER HEATER
POWER RELAY (RY3, RY4)
POWER RELAY (RY5)
ON (Sec.)
OFF (Sec.)
ON (Sec.)
OFF (Sec.)
25
10
10
25
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 RY3, RY4
& RY5 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 RY3, RY4
& RY5 again.
4 DESCRIPTION OF OPERATING SEQUENCE
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NN-DS592M
OVEN FUNCTION:
NOTE:
If only upper heater or lower heater works, cooling fan
moter would rotate for 3 minutes after cooking to cool down
oven and electric components.
moter would rotate for 3 minutes after cooking to cool down
oven and electric components.
4.5. Double grill cooking control
There are 2 phases in double grill cooking. The first phase just
microwave and the second phase just grill cooking (upper
heaters).
microwave and the second phase just grill cooking (upper
heaters).
4.6. Single grill cooking control
Single grill cooking is accomplished by both two upper heaters
only. During single grill cooking, microwave and lower heater
would not work. One single grill cooking cycle is 33 seconds.
In all three single grill cooking categories, power relay RY3 &
RY4’s ON-OFF time as shown in Figure.
only. During single grill cooking, microwave and lower heater
would not work. One single grill cooking cycle is 33 seconds.
In all three single grill cooking categories, power relay RY3 &
RY4’s ON-OFF time as shown in Figure.
SINGLE GRILL
COOKING TIME
UPPER HEATER
MICROWAVE
(RY1)
POWER RELAY (RY3, RY4)
ON (sec.)
OFF (sec.)
1
33
0
OFF
2
24
9
OFF
3
18
15
OFF
SINGLE GRILL
COOKING TIME
UPPER HEATER
POWER RELAY (RY3, RY4)
ON (Sec.)
OFF (Sec.)
10 min.
33
0
10 min.
18
15
4.7. Combination cooking control
Combination cooking is accomplished by microwave and grill
cooking (upper heater) being done during one combination
cooking cycle. One combination cooking cycle is 33 seconds.
1. During combination cooking, the digital programmer circuit
cooking (upper heater) being done during one combination
cooking cycle. One combination cooking cycle is 33 seconds.
1. During combination cooking, the digital programmer circuit
controls power relay RY3 & RY4´s ON-OFF time. In all
three combination cooking categories, power relay RY1
always stay on, but RY3 & RY4´s ON-OFF time as shown in
Figure.
three combination cooking categories, power relay RY1
always stay on, but RY3 & RY4´s ON-OFF time as shown in
Figure.
COMBINATION
CATEGORY
UPPER HEATER
MICROWAVE
(RY1)
POWER RELAY (RY3, RY4)
ON (sec.)
OFF (sec.)
1
33
0
ON
2
24
9
ON
3
18
15
ON
COMBINATION
CATEGORY
UPPER HEATER
POWER RELAY (RY3, RY4)
ON (Sec.)
OFF (Sec.)
10 min.
33
0
10 min.
18
15
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NN-DS592M
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