Interlock Application Scheme # 33 - Motor or Machine Guard

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Interlock Application - Motor or Machine Guard

Scheme # 33
To prevent opening of guard B with motor circuit closed.

Starting switch normally closed. Key A-1 is held in starting switch interlock. Guard B (or door) is locked closed by means of type D (detachable) interlock.

1.
2.

3.

4.

Open starting switch.
Turn key A-1 in L-O interlock on switch to lock open. Key A-1 is now free.
Insert key A-1 in L-C interlock (type D) on guard B and turn to unlock. Key A-1 is now held.
Open guard. Service person can remove key A-2 and hold until the service is complete. Thereby ensuring that the key sequence cannot be reversed until the guard is locked closed again.

Reverse sequence to restore service.

Links for more interlock application scheme information:

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Scheme # 10A
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