Mitsubishi Electric FR-CV-7.5K Instruction Manual page 12

Structure
(2) Control circuit terminal block cover
Opening
1)Hold the right end of the cover and pull it toward you.
2)The cover opens, with the left-hand side of the cover acting as a support.
Closing
1)Securely press the right end of the cover against the unit.
Note: Make sure that the cover has been fitted securely.
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