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NN-6207, NN-6307, NN-6407
NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807
DESCRIPTION OF OPERATING SEQUENCE
1. Variable power cooking control (NN-6207)
The vari-power controller controls the ON-OFF time of the vari-power
OUTPUT POWER
ON, OFF TIME ON
switch to vary the output power of the microwave oven from "Warm" to
INDICATION
oe
VARI-POWER SWITCH/
"High". The vari-power controller is a part of the timer assembly. The
ra TOMER
POWER RELAY B
timer assembly consists of timer motor, timer switch, vari-power switch
225
225
and the combination of gears, cam and actuater lever.
22/22 (700W)
ON
aa
One complete cycle of the vari-power controller is 22 seconds, in which
-
.
'
"
"
"
"
.
;
17S
5S
the vari-power switch is tumed
"ON" or "OFF" by the cam rotation in
|
47/22 (70%)
13S
9s
Defrost
138
Ss
14S
Low
8/22 (30%)
ON
OEE
4S
18S
Warm
4/22 (15%)
Defrost
Approx.
Please refer to description
(Touch model)
110W
of cyclic defrost.
H
the 22 - 2 second period.
By controlling the timing of the vari-power switch "ON" period, the
120V AC supplied to the high voltage transformer is interrupted intermit-
tently so that the average output power of the microwave oven is varied.
Fig. 4 shows the timing chart of vari-power switch operation in respect
to the power setting on the control panel.
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.
1". Variable power cooking contro! (Touch control models)
The coil of power relay B (RY2) is energized intermittently by the digital
programmer circuit, when the oven is set at any power selection except
for High power position. The digital programmer circuit controls the ON-
OFF time of power relay B contacts in order to vary the output power of
the microwave oven from "Warm" to "High" power. One complete ON
and OFF cycle of power relay B is 22 seconds.
The relation between indications on the control panel and the output of
the microwave oven is as shown in Fig. 4
ae
om
ae
=
a
NOTE: The ON/OFF time ratio does not correspond with the percentage of
ig
AN
De RA
aavered
microwave power since approximately 2 seconds are required for
heating of magnetron filament.
2. Cyclic defrost (Touch control models)
When defrost power and defrosting time are selected and Start pad is
j i
Fig. 4
TOTAL DEFROSTING TIME
tapped:
(C) During standing periods, power relay B is always open resulting in no
'Ic
=
ce
ae
aa
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 2: If defrosting time is selected for 5 minutes, each operating
period will be as follows : (See Fig. 8)
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, the
power relay B will not be energized at all.
Fig. 7
SMIN
(300SEC)
1ST
1sT
2N0
2N0
ast
SFROSTING(
37S} STANDING(37S)
)OEFROSTING(37S)
STANODINGI3/S)
thee NDING. 418)
93) 138 | 98163,
Fig. 8
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