Mealstream Ovens Pt. No. 32Z3403 Issue 15
Page 27
1.
Monitor switch ( 14 ,Top left-hand Side ).
The Monitor switch will produce
a short circuit across the mains supply if the Primary interlock switch is
faulty, when the door is opened, thus blowing the microwave fuse and
rendering the oven inoperative.
2.
Primary Interlock ( 11 , Bottom left-hand )
and Secondary Interlock
( 17 , Bottom right-hand ) Switches.
Operate simultaneously.
The Primary switch will cut off the microwave emissions from the oven when
the door is opened by breaking the electrical supply circuit to the
transformers. The Secondary interlock switch will cut off the microwave
emission if the Primary switch have failed.
Note:
If operation of the Monitor switch has caused the Microwave Fuse to blow,
the Primary and Monitor microswitches must be changed, as they may have
been damaged by the high short-circuit currents involved.
The door on the Mealstream oven is monitored by three microswitches. These are used in the
conventional “Primary, Secondary and Monitor” switch arrangement shown below.
The switches operate as follows:
Door Interlock Arrangement
Power In
Power Out
L
1
L
2
14
Monitor switch
11
Primary switch
17
Secondary switch
Switches shown in Door Closed position
PROCEDURE
FOR
DOOR INTERLOCK ADJUSTMENT
AND
TEST (1)
