Page 14 MD Series Ovens 32Z3329 Issue 6
Door interlock operation
The door on the oven is monitored by four microswitches. Three of these are used in the
conventional “Primary, Secondary and Monitor” switch arrangement shown below, while the fourth
is a low-voltage switch linked directly to the control circuitry.
Door interlock arrangement
66a
66b
Power In Power Out
L
N
66d
66c
The switches operate as follows:
1. Monitor Switch [66b , Top ]. As the door is closed, the monitor switch is opened.
2. Primary Interlock Switch [ 66a , Lower Middle ]. The Primary switch is then closed.
3. Secondary Interlock Switch [ 66c , Upper Middle ]. The Secondary Switch then closes.
4. Low voltage Switch [ 66d , Bottom ]. The Low voltage switch operates concurrently with
the Primary and Secondary switches.
When the door is opened, the switches operate in the reverse order.
Door interlock operation
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