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NE-9/2
|
DESCRIPTION OF OPERATING SEQUENCE
1, Variable power cooking control
The coil of power relay (5) is energized intermittently by the digital
Power setting | Output Power
programmer circuit, when the oven is set at any power selection ex-
cept for High power position. The digital programmer circuit controls
the ON-OFF time of power relay (5) contacts in order to vary the out-
;
put power of the microwave oven from "Warm" to "High" power. One
Ly | 6OOW (22/22)
complete ON and OFF cycle of power relay (5) is 22 seconds.
The relation between indications on the control panel and the output
'fi
On-Off Time of
Power Relay (5)
of the microwave oven is as shown in Fig. 2A.
Medium ™ | 480W (19/22)
NOTE: The ON/OFF time ratio does not correspond with the percentage
of microwave power since approximately 2 seconds are required
45 Gad.
237-566
for heating of magnetron filament
Co | 360W (15/22)
2. Cyclic defrost
When defrost power and defrosting time is selected and Start pad is
touched:
180W (9/22)
(A) The digital programmer circuit (DPC) divides the total defrosting time
into 8 intervals of alternating defrosting power and standing periods.
(See Fig. 2B)
70W (4/22)
(B) During defrosting power period, power relay (5) is energized for 10
seconds and de-energized for 12 seconds by DPC. (See Fig. 2C)
{C) During Standing periods, power relay (5) is always open resulting in
Approx. 120W|
Refer to description of cyclic defrost.
no microwave power.
NOTE: Defrost time selected is converted into seconds by the DPC but
display will show selected time in minutes and seconds as prog-
rammed. The total number of seconds is divided into 8 time
periods. The remainder (seconds not equally divisible by 8) are
added to the last standing time period.
Example # 1: If defrosting time is selected for 2 minutes 56 seconds,
each operating period will be as follows
: (See Fig. 2D)
2 minutes 56 seconds = 176 seconds 176/8 =
Example # 2: If defrosting time is selected for 5 minutes, each operating
DEFROST
DEFROST
DEFROST
period will be as follows : (See Fig. 2E)
5 minutes = 300 seconds
300/8 = 37 and remainder is 4 seconds.
The 4 seconds is added to the last time period.
NOTE: When defrosting time is selected for not more than 7 seconds,
Fig. 2B
the power relay (5) will not be energized at all.
:
Fig. 2A
TOTAL DEFROSTING TIME (T)
ONE DEFROSTING PERIOD
2 MIN..56 SEC. (176 SEC.)
ONE
ONE
ONE
elie
STANDING
DEFROSTING
(228)
(22S)
Fig. 2D
5 MIN. (300 SEC}
1ST
2ND
ane
woe NG
STANONG
)
(415)
ALL OFF
ALL OF
Fig. 2E
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