Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 139

9. Unit Replacement
9.1 Preparation for unit replacement
Be sure to observe the following precautions when replacing the unit.
(1) Turn OFF the power to the entire system, including peripheral devices.
(2) High-voltage remains in the spindle drive unit even after the power is turned OFF. Do not touch
the unit terminal block or regenerative resistor for 3 to 4 minutes after turning the power OFF.
(3) When 3-4 minutes have passed after turning the power OFF, disconnect all cables connected to
the unit.
Never carry out work on the unit while the power is ON. Doing so could damage the normal unit and
peripheral devices, and is also dangerous.
9.2 Unit replacement method
The following shows the replacement method for the spindle drive unit.
[1] Disconnect all cables from the front of the unit.
[2] Loosen screws A and B. (They do not need to be removed.)
[3] While supporting the unit with one hand, remove screws C and D.
[4] Lift the unit upward.
[3] Screw C
[2] Screw A
9. Unit Replacement
[3] Screw D
[2] Screw B
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