Common faults and solutions for CNC machine tool spindles IV

Problem five:The spindle stops immediately after starts.

The cause of the failure and the solution:

1. System output pulse time is not enough: adjust the system's M code output time.

2. The inverter is in jog state: Refer to the instruction manual of the inverter and set the parameters.

3. The control components of the spindle line are damaged: check whether the contacts on the circuit are in good contact, check whether the DC relay is damaged which caused the contact can not self-lock. 

4. The spindle motor is short-circuited, causing thermal relay protection: find the cause of the short circuit and reset the thermal relay.

5. The spindle control loop does not have self-locking circuit, and the parameter is set to pulse signal output, so that the spindle can not operate normally: change the start and stop parameters of the system control spindle to the level control mode.

Problem six: the spindle rotation can not stop

The cause of the failure and the solution:

1. AC contactor or DC relay is damaged and uncontrollable: replace AC contactor or DC relay.

Common faults and solutions for CNC machine tool spindles III

Problem three: the rotating speed of the spindle without frequency conversion (shift spindle) is not controlled

The cause of the failure and the solution:

1. System has no S01-S04 control signal output: Check whether the system has shift control signal output. If no, it is system failure, replace the IC or send the factory for repair.

2. Connection line failure: If the system hasshift control signal output, check whether there is any open circuit or poor contact on each connection line, and check whether the DC relay or AC contactor is damaged.

3. The spindle motor is damaged or open circut : Check the spindle motor.

4. Machine is not linked: hang up the gear.

Problem four: the spindle has no brake

The cause of the failure and the solution:

1. Abnormal brake circuit or strong electrical components damage: Check whethr bridge stack, fuse or AC contactor is damaged; check if the high-voltage circuit is open.

2. Braking time is not long enough: adjust the braking time parameter of the system or inverter.

3. System has no brake signal output: replace internal components or send to the factory for repair.

4. The inverter control parameters are not adjusted: Check the inverter manual and set the inverter parameters correctly.

Common faults and solutions for CNC machine tool spindles II

Problem two: the spindle with the inverter does not turn​

The cause of the failure and the solution:

1. Mechanical transmission failure: Check whether the driving belt is broken or whether the machine tool is in neutral.

2. Three-phase power supply to the spindle is missing: Check the power supply and exchange any two power lines.

3. The inverter control parameters of the CNC system are not open: see the system manual to understand the inverter parameters and change them.

4. Line connection error between the system and the inverter: Check the connection manual of the system and the inverter to ensure the connection is correct.

5. The analog voltage output is not normal: Check whether the analog voltage output by the system is normal with a multimeter; check whether the analog voltage signal line connection is correct or the contact is good, and the analog voltage received by the inverter matches.

6. High-voltage control part is disconnected or component is damaged: Check whether the connection of each contact of the spindle power supply is reliable and whether the DC relay is damaged or the fuse is burnt out.

7. Inverter parameters are not adjusted: The inverter contains control mode selection, which is divided into inverter panel control spindle mode, NC system control spindle mode, etc. If NC system control mode is not selected, we can not control spindle with system; check if the relevant parameter settings are reasonable or change them if necessary. 

Common faults and solutions for CNC machine tool spindles I

Problem one: the spindle without frequency conversion does not turn

The cause of the failure and the solution:

1 Mechanical transmission failure: Check whether the driving belt is broken or whether the machine tool is in neutral.

2 Three-phase power supply to the spindle is missing or inverting: Check the power supply and exchange any two power lines.

3 Wrong circuit connection: Carefully refer to the circuit connection manual to ensure that the connection is correct.

4 The system has no corresponding spindle control signal output: use the multimeter to measure the system signal output terminal. If there is no spindle control signal output, you need to replace the relevant IC components or send it to the factory for maintenance.

5 The system has the corresponding spindle control signal output, but there is an open circuit or component damage in the power supply line and the control signal output line: use the multimeter to check the power supply circuit between the system and the spindle motor, and whether there is an open circuit in the signal control circuit; whether contact between the wires is not good; whether AC contactor or DC relay is damaged; check if the thermal relay is overcurrent; check if the fuse is burnt.