If the inverter control parameters of the CNC system are not turned on, we need to consult the system manual to understand the inverter parameters and change them.
If it is suspected that the three-phase power supply to the spindle is lacking phase or reversed phase, we need to check the power supply and exchange any two power lines. If it is suspected to be a mechanical transmission failure, we need to check whether the transmission belt is broken or whether the machine tool is in neutral gear. Check whether the contacts between the wires are in poor contact whether the AC contactor and DC relay are damaged check whether the thermal relay is over-current check whether the fuse is burned, etc. If the system has corresponding spindle control signal output, but the power supply line and control signal output line are open or the components are damaged, then we can use a multimeter to check whether the power supply and signal control circuit between the system and the spindle motor is open Happening. If there is no spindle control signal output, we need to replace the relevant IC components or repair If the system has no corresponding spindle control signal output, we can use a multimeter to measure the system signal output terminal. If it is suspected that the circuit connection is wrong, we need to carefully refer to the circuit connection manual to ensure that the connection is correct 
If it is suspected that the three-phase power supply to the spindle is lacking phase or reversed phase, we need to check the power supply and exchange any two power lines If it is suspected to be a mechanical transmission failure, we need to check whether the transmission belt is broken or whether the machine tool is in neutral
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