What will happen when you disconnect all the cables from the J3 axis motor?

When all the cables are disconnected from the J3 axis motor, the correct outcome is that the J3-axis will have to be mastered. Mastering an axis involves positioning the machine to a designated reference point so that the control system can establish a baseline for the axis's movements. This is essential for accurate positioning and operation. Disconnecting the cables disrupts the communication between the motor and the control unit, leading to the loss of the current positional information. Consequently, the system will not know where the axis is located in relation to its programmed limits or zero position, necessitating a re-mastering process once the cables are reconnected.

The other scenarios do not accurately reflect the implications of disconnecting the motor's cables. The motor will not automatically reset, as reset operations typically involve software commands rather than hardware disconnections. Settings associated with that axis may not be preserved due to the loss of power and communication, meaning any temporary or positional data may be lost. Furthermore, the axis going into a "safe mode" is not a standard response to disconnection; it would require specific internal logic conditions to be met, which are not inherently triggered by the act of simply disconnecting cables.