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My Micrologic 5.0P or 6.0P or H trip unit will not allow me to adjust the on-screen settings. What is the problem?

Micrologic Power or Harmonic trip unit won't let me change the on-screen settings.  What is the problem?

Product Line:
Masterpact, Powerpact

5.0P, 6.0P, 5.0H, 6.0H

The trip unit settings cannot be adjusted via the menu buttons on the trip unit screen unless the switch cover is OPEN.  
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