Merrychef 501 Service Manual download pdf (Page 19)

Page 19 Mealstream Ovens 32Z3387 Issue 2

1. Primary Interlock [ 11 , Bottom left-hand ] and

Secondary Interlock [ 17 , Bottom right-hand ] Switches.

Operate simultaneously.

The Primary switch or Secondary switch will cut off the microwave emissions from

the oven when the door is opened by breaking the mains supply circuit to the

transformers.

2. Monitor [ 14 ,Top left-hand Side ]

The Monitor switch will produce a short circuit across the mains supply if the

Primary interlock switch is faulty, thus blowing the microwave fuse and rendering

the oven inoperative.

The Secondary interlock switch will cut off the microwave emission if the other

switches 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.

Door interlock operation

The door on the 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

14 Monitor switch

Primary switch

17 Secondary switch

The diagram shows the microswitches in door closed position

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 28 29

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Merrychef 501 Service Manual Page 19