Electrolux E30SO75ESS User Manual

6
E30SO75ESS
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
OFF CONDITION
Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 240 volts A.C. is supplied to the
control unit. (Figure O-1).
1. The display will show "WELCOME TOUCH CLEAR
AND TOUCH CLOCK".
To set any program or set the clock, you must first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.
NOTE: When the door is opened, the oven lamp comes on.
2. A signal is input to the control unit, energizing the coil of
shut-off relay (RY-4). RY4 contacts close, completing a
circuit to the damper motor. The damper motor now
operates moving the damper to the open position, thereby
closing the contacts of the damper switch inputs a signal
to the control unit. The coil of relay RY-4 is de-energized,
opening its contacts, thereby turning off the damper motor.
MICROWAVE COOKING CONDITION
Program desired cooking time Variable Cooking Control by
touching the NUMBER pads and the power level pad. 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.
(For details, refer to Figure O-2)
RELAY CONNECTED COMPONENTS
RY-1 Oven lamp/Turntable motor
RY-2 Power transformer
RY-3 Convection motor
RY-4 Damper motor
RY-5 Fan motor
RY-6 Convection motor
2. 240 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.3 volts
A.C. output on the filament winding, and approximately
2300 volts A.C. on the high voltage winding.
3. The filament winding voltage heats the magnetron filament
and the H.V. winding voltage is sent to a voltage doubler
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
be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition.
6. When the door is opened during a cook cycle, monitor
switch, door sensing switch, relay (RY1), the primary
interlock relay (RY2) and the secondary interlock switch
are activated with the following results. The circuits to the
turntable motor, the cooling fan motor, and the high
voltage components 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. The monitor switch is electrically monitoring the operation
of the primary interlock relay (RY2) and the secondary
interlock switch and is mechanically associated with the
door so that it will function in the following sequence.
(1) When the door opens from a closed position, the primary
interlock relay (RY2) and the secondary interlock switch
open their contacts. And contacts of the relay (RY1)
remain closed. Then the monitor switch contacts close.
(2) When the door is closed from the open position, the
monitor switch contacts first open, and then the contacts
of the secondary interlock switch close. And contacts of
the relay (RY1) open.
If the primary interlock relay (RY2) and the secondary
interlock switch fail with their contacts closed when the door
is opened, the closing of the monitor switch contacts will
form a short circuit through the monitor fuse, relay (RY1),
primary interlock relay (RY2) and the secondary interlock
switch, causing the monitor fuse to blow.
POWER LEVEL P-0 TO P-90 COOKING
When Variable Cooking Power is programmed, the 240
volts A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY-2). RY-2 is operated by
the control unit within an varying time base. Microwave
power operation is as follows:
VARI-MODE ON TIME OFF TIME
HIGH POWER (100% power) 32 sec. 0 sec.
90 PERCENT (approx. 90% power) 30 sec. 2 sec.
80 PERCENT (approx. 80% power) 26 sec. 6 sec.
70 PERCENT (approx. 70% power) 24 sec. 8 sec.
60 PERCENT (approx. 60% power) 22 sec. 10 sec.
50 PERCENT (approx. 50% power) 18 sec. 14 sec.
40 PERCENT (approx. 40% power) 16 sec. 16 sec.
30 PERCENT (approx. 30% power) 12 sec. 20 sec.
20 PERCENT (approx. 20% power) 8 sec. 24 sec.
10 PERCENT (approx. 10% power) 6 sec. 26 sec.
0 PERCENT (0% power) 0 sec. 32 sec.
Note: The ON/OFF time ratio does not correspond with
the percentage of microwave power, because
approx. 3 seconds are needed for heating of the
magnetron filament.
CONVECTION COOKING CONDITION
PREHEATING CONDITION
Program desired convection temperature by touching the
PREHEAT pad and the Temperature pad. When the START
pad is touched, the following operations occur: (Figure O-3)
1. The coil of shut-off relays (RY1, RY3 and RY5) are
energized, the oven lamp, cooling fan motor, turntable

Electrolux E30SO75ESS Specifications

General

Brand	Electrolux
Model	E30SO75ESS
Category	Oven
Language	English