Mitsubishi MELFA CR1D Instruction Manual page 5

CAUTION
Do not stop the robot or apply emergency stop by turning the robot controller's
main power OFF. If the robot controller main power is turned OFF during
automatic operation, the robot accuracy could be adversely affected.Moreover,
it may interfere with the peripheral device by drop or move by inertia of the arm.
CAUTION
Do not turn off the main power to the robot controller while rewriting the
internal information of the robot controller such as the program or parameters.
If the main power to the robot controller is turned off while in automatic
operation or rewriting the program or parameters, the internal information of the
robot controller may be damaged.