(1)   Power is the energy source of the maintenance system and the whole machine work properly; its failure or malfunction light will be lost data, resulting in downtime.

① provide independent distribution box without a string to use with other devices.

② areas of poor quality of power supply should be equipped with a three-phase AC voltage stabilizer.

③ power supply end of the beginning of a good grounding.

④three-phase power supply into the CNC machine tools should be used for three-phase five-wire system, the midline (N) and earth (PE) strictly separate.

⑤ The cabinet electrical layout and laying of AC and DC lines to be isolated from each other.

(2) failure of the numerical control system position loop

① position loop alarm. May be the position measuring open circuit; measuring cell damage; position control to establish the interface signal does not exist.

② axis in case there is no instruction movement. Drift over; position loop, speed loop connected as positive feedback; feedback connection open; measuring cell damage.

③Machine coordinates can not find zero. May be zero direction away from zero; damage to the encoder or wiring; grating zero marked shift; back to zero deceleration switch failure.

④ Machine tool

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