Mitsubishi Electric Melservo-J3 Series MR-J3-B Instruction Manual page 314

13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
(b) Lower terminal block cover
1) How to open
Hold the bottom of the terminal block cover
with both hands.
Pull up the cover using the axis B), B)' as a
support.
B)
B)'
When pulled up to the top, the cover is fixed.
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