Electrolux E30MO65GSSB, Техническое и сервисное руководство

Страница: 20 / 64

Operation
2-8
DOOR SENSING AND PRIMARY INTERLOCK
SWITCHES
The door sensing switch in the secondary interlock
system is mounted in the upper position on the latch
hook, the primary interlock switch is mounted in the lower
position on the latch hook. They are activated by the
latch heads on the door. When the door is opened, the
switches interrupt the circuit to all components. A cook
cycle cannot take place until the door is firmly closed
thereby activating both interlock switches. The secondary
interlock system consists of the door sensing switch and
secondary interlock relay located on control circuit board.
Figure 2-5. Door Open Mechanism
Component Descriptions
THIRD DOOR SWITCH
The switch is activated by the latch heads while the door
is closed. When the door is opened, the switch interrupts
the circuit to power transformer preventing the power
transformer from engaging when the door is opened.
MONITOR SWITCH
The monitor switch is mounted on the middle position of
latch hook. It is activated (the contacts opened) by the
lower latch head while the door is closed. The switch
is intended to render the oven inoperative by means of
blowing the monitor fuse when the contacts of the relay
RY1 and primary interlock switch fail to open when the
door is opened.
Functions:
1. When the door is opened, the monitor switch
contact close (to the ON condition) due to their being
normally closed. At this time, the door sensing and
primary interlock and third door switches are in the
OFF condition (contacts open) due to their being
normally open contact switches.
2. As the door goes to a closed position, the monitor
switch contacts are first opened and then the door
sensing switch, third door switch and the primary
interlock switch contacts close. (On opening the door,
each of these switches operate inversely.)
3. If the door is opened, and the relay RY1 and the
primary interlock switch contacts fail to open, the
monitor fuse blows simultaneously with closing of the
monitor switch contacts.
Before replacing a blown monitor fuse, test the door
sensing switch, primary interlock switch, relay(RY1)
and monitor switch for proper operation.
Monitor fuse and monitor switch are replaced as an
assembly.