6
R-530ES
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
Thefollowingisadescriptionofcomponentfunctionsduring
ovenoperation.
OFF CONDITION
Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switchcontactsare opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
controlunit.(FigureO-1).
1. The display will show "Welcome".
Tosetanyprogramorsettheclock,youmustfirsttouch
theSTOP/CLEARpad. The display will clear,and" : "
willappear.
COOKING CONDITION
Program desired cooking time by touching the NUMBER
pads. Program the power level by touching the POWER
LEVELpad.
When the START pad is touched, the following operations
occur:
1. The contacts of relays are closed and components
connected to the relays are turned on as follows.
(Fordetails, referto FigureO-2)
RELAY CONNECTEDCOMPONENTS
RY-1 ovenlamp/turntablemotor/fanmotor
RY-2 powertransformer
2. 120 volts A.C. is supplied to the primary winding of the
powertransformerandisconvertedtoabout3.2voltsA.C.
output on the filament winding, and approximately 2360
volts A.C. on the high voltage winding.
3. Thefilamentwindingvoltageheatsthemagnetronfilament
andtheH.V.windingvoltageissenttoavoltagedoubler
circuit.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feed-
box, and then into the cavity where the food is placed to
becooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generationofmicrowaveenergyisstopped.Theovenwill
revert to the OFF condition.
6. Whenthedoorisopenedduringacookcycle,themonitor
switch,doorsensing switch,secondaryinterlockswitch,
relay(RY1)andprimaryinterlockrelayareactivatedwith
the following results. The circuits to the turntable motor,
thecoolingfan motor, and thehighvoltagecomponents
are de-energized, the oven lamp remains on, and the
digital read-out displays the time still remaining in the
cook cycle when the door was opened.
7. Themonitorswitchelectricallymonitors theoperationof
thesecondaryinterlockswitchandprimaryinterlockrelay
andismechanicallyassociatedwiththedoorsothatitwill
functioninthe following sequence.
(1) Whenthedooropensfromtheclosedposition,theprimary
interlockrelay(RY2)andsecondaryinterlockswitchopen
their contacts. And contacts of the relay (RY1) remains
closed. Then the monitor switch contacts close.
(2) When the door is closed from the open position, the
monitor switch contacts open first. Then the contacts of
the secondary interlock switch and door sensing switch
close. And contacts of the relay (RY1) open.
Ifthesecondaryinterlockswitch andprimaryinterlockrelay
(RY2)failwiththecontactsclosedwhenthedoorisopened,
the closing of the monitor switch contacts will form a short
circuitthroughthemonitorfuse,secondaryinterlockswitch,
relay (RY1) and primary interlock relay (RY2), causing the
monitor fuse to blow.
POWER LEVEL 0% TO 100% COOKING
WhenVariableCookingPowerisprogrammed,the120volts
A.C. is supplied to the power transformer intermittently
throughthecontactsofrelay(RY-2)whichisoperatedbythe
controlunitwithina32secondtimebase.Microwavepower
operation is as follows:
VARI-MODE ON TIME OFF TIME
100% power 32 sec. 0 sec.
approx. 90% power 30 sec. 2 sec.
approx. 80% power 26 sec. 6 sec.
approx. 70% power 24 sec. 8 sec.
approx. 60% power 22 sec. 10 sec.
approx. 50% power 18 sec. 14 sec.
approx. 40% power 16 sec. 16 sec.
approx. 30% power 12 sec. 20 sec.
approx. 20% power 8 sec. 24 sec.
approx. 10% power 6 sec. 26 sec.
0% power 0 sec. 32 sec.
Note: TheON/OFFtimeratiodoesnotcorrespondwiththe
percentageofmicrowavepower,becauseapprox.2
seconds are needed for heating of the magnetron
filament.
