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No. Symptom Fault Analysis Fault Cause Remedy System Model No. 1 CRT No display Check CRT, display circuit, main control board main control board failure Replace the main control board 3 2 CRT No display, all indicators on the operation panel are off Power supply, no ±5V output, check the three-terminal regulator 7805, boost the power supply tube power supply within the 2SA770 shut-off damage replace the power supply tube 7 3 CRT cursor no display check CRT board cursor circuit is not normal replacement shift register 74LS166 3 4 CRT No display check I/O signal of CRT board, I/O signal from motherboard to CRT board The address bus of the motherboard is not normal Replace the address latch on the motherboard E39 3 5 CRT No display Check the CRT board and system board RAM Chip select signal No Output replaces 74LS32 chip of mainboard D36 3 6 CRT display: NOT READY Check input condition from PLC, check remaining peripheral condition A14 (change tool in place detection) Relay coil short-circuit to ground to eliminate shorting 11 Y coordinate jitter detection: system position loop, speed gain; thyristor circuit; coordinate balance; tachometer position detection device adjustment, slider 6M 12 spindle serious noise, the initial gap to make a ring, then violent vibration, spindle speed sudden Raise down: spindle servo motor connection plug; servo circuit a phase, spindle motor itself; output pulse wave; spindle servo system waveform sorting circuit clock integrated block 7555 natural damage new clock integrated block 6MB 13 machine vibration, Y axis Strong vibration, 401# alarm check the power phase sequence, servo board frequency switching machine moves, the manufacturer mistakes the phase sequence of the power supply and the servo unit to adjust the relative phase sequence 6M 14 X coordinate coordinate jitter check: system position loop, speed loop gain , SCR circuit, coordinate balance, tachometer, servo drive motor, mechanical transmission bearing replacement bearing 7CM 15 X axis vibration in motion, especially fast, more serious when checking acceleration and deceleration: connection of motor and feedback device Replace the servo drive (still fault); measure the motor current, voltage (normal); measure the feedback current and voltage of the tachometer, Voltage ripple current is too large and irregular corrugations tacho rotor commutation toner is hard short-circuit between the sheets, resulting in abnormal feedback cleaning toner 7
16 When running the program, the machine suddenly stops moving, and the alarm is repeated. Check the cause of the alarm. The +LX signal disappears instantly. Adjust and tighten the signal plug. 3TA 17 Tool change stops. Alarm No. 99 checks tool alignment with the spindle cone. Hole condition stopper detection switch is loose, the computer does not detect the height of the tool rise re-fixed stopper detection switch 3MC 18 machine tool table can not act to control the hydraulic circuit board in a solid state relay damage external power supply 10500V transformer broken The phase fuse is changed to single-phase. The other solid state relay with no function used on the control circuit board is removed and replaced with 6M. 19 The machine tool table can not be operated. The solid state relay of the control hydraulic valve is normal, but the indicator light of the hydraulic valve is off. Push the hydraulic valve core, the small circuit board in the movable valve of the movable table in the worktable Welded to open the hydraulic valve, take out the small circuit board and weld it well 6M 20 The robot can't move before the sudden power failure. The robot's tool change instruction has been read in due to power outage. The manipulator did not perform any action. After the external power supply was restored, the tool change command was not reset. The power supply was suddenly turned off by the manipulator. The hydraulic valve of the hand pushes the normal direction of the robot to 6M
21 The spindle is not braked. When the brake function is executed, the spindle vibration checks the brake circuit. The spindle control device components are damaged. Replace the components. 6MB 22 The inverter controller does not work. Check the NC fault, the PLC interface is faulty, the inverter controller itself is faulty. PLC interface Failure, resulting in loss of power repair PLC interface 17# board 6TB 23 CNC cabinet can not start ZK master switch, all other parts are normal ZK master switch current relay has a phase burnout repair relay 6M 24 did not reach the reference point, the occurrence of overtravel, intermittent Check whether the check parameters are correct, check the limit switch of the limit switch for overtravel limit switch; when the operator maintains the machine tool, move the limit switch repair limit switch, change the parameter of travel limit to a larger value, and open the machine tool. Go to the reference point, press the limit switch, and then change back to the original setting parameters. 3MC 3MA 25 Table Y does not have a rapid or no deceleration process when returning to the reference point. Sometimes the Y-axis moves to the center of the stroke range and the overtravel alarm limit is sent. Parameter and peripheral circuit parts Y-axis limit combination switch has problems, connection and contact corrosion rust, disconnection clearance limit switch 3M
26 The system has no alarm, and the Y-axis zero point return is completed. When it reaches the end of a certain block, the program stalls. The next block does not check the signal of each part. Check the external environment system overheating and cooling 6MB 27 Z-axis cannot be returned to zero. Zero Principles and Methods Z-axis Low-speed Movement Decreased Adjusting the Drive System 6M 28 When the program is running, the tool table plungs forward and goes to the overtravel alarm to check the CNC system. Check programming programming error. One program has a decimal point less 6T-C 29 Fast Positioning, Z axis shakes up and down, no alarm check amplification is too large, check plus / deceleration time too short acceleration / deceleration time is too short to adjust the compensation capacitance on the servo board amplifier, increase the capacitance, normal 6 30 machine random walk Internal procedures, unclear to re-send the program, normal 7
31 Y-axis overtravel, emergency stop alarm, machine lock check the switch position, parameters, check the parameter protection switch is not locked because the parameter switch is not locked, wrong signal trigger re-enter the parameter, lock 7CM 32 magazine entry and exit impact Travel switch solenoid valve action is not reliable working environment is not good, solenoid valve maintenance cycle is long, the poor quality of the device pay attention to the usual maintenance 3M 33 regardless of manual or automatic state, can not find the No. 3, No. 4 tool connection tool location detection tool change Encoder PC PC E5B and E4B (SN75463) burned out Replace the 75463 driver block 3T-F 34 The tool changer did not pull the knife to check the LS12 switch, check the PC screen 46.2 parameter switch disconnection, the signal did not feed back to the PC weld wire 6M 35 Tool number Can't write in, read/write status is inconsistent. Display: address 00,01,02,03,04,05,...17,18,19; tool number 01,01,03,03,05,05,...17,17,19,19; tool magazine zero generation Alarm, using the T command, single 09 alarm, double 10 alarm. Analyze the logic circuit diagram, the memory random tool control part, check the RA, and from the control end of the chip, when the write state is found, WE remains high and always in read state. B6 has long been replaced. Check B6. The output signal of the previous stage is normal. The fault may be between B6 and the previous stage. The PC 03 board has dummy solder joints. Excluding solder joints 7
36 Positioning tool magazine zero return is not allowed. Observe the zero return status of the tool magazine. Check the travel switch. The travel switch is released in advance after deceleration. It does not enter the positioning area and causes forward or backward to the nearest zero point to make positioning inaccurate. Directional stop moves. Adjust the positioning stop 7 37 CRT display tool code only allows single number write, tool magazine zero return 09 alarm check the control of the RAM on the PC; check even coding of the cutter code disk C1; check B2, D3, D4; check RAMA49 terminal, 10 terminal; check D5 comparator 10 terminal and 9 terminal is not the same, 9 terminal is at a high level on the printed circuit board with a breakpoint to clear the breakpoints 7 38 manual, automatic tool exchange when the tool sleeve no action, and spindle orientation After the magazine returns to zero, the relevant indicator light is off. Check solenoid valve PDNT, no action; relay, PDNJ no action; check PC send signal, RO724 non-response machine output PC signal does not meet the requirements of the knife sleeve movement, robot 180° return travel switch position adjustment inductive travel switch position Signal 7 39 The tool magazine does not rotate, does not return to the reference point, does not turn the first check the limit switch does not press the travel switch to help press the switch 7M 40 01 alarm check panel, LED light check coupling circuit F1F2F3 blown fuse 7M
41 Automatic tool change operation. After the tool case is down, the spindle moves downwards at the same time to check the PC board. 20ms The clock generator is damaged. Replace the fuse 7M 42 Tool compensation error. Check the old program correctly, and the new program is correct. The tool compensation software EPROM is damaged. Replace EPROM 7CM 43 tool change can not be normal to check the PC, go to the ladder diagram to determine the connection to check the bad connection to reconnect the line 11M 44 Z axis servo system can not work, easy to burn Z axis 30A fuse check the servo system (including replacement speed Adjustment unit printing plate) SCR turns off unsuccessfully in small signal Replace SCR 7CM 45 Y-axis oscillation check servo system, find TACH damaged speed-measurement motor rotor open change speed motor rotor 7CM
46 Y-axis servo board alarm: "07" speed control unit is not ready to check according to the instructions, all normal. Check the motor armature carbon brush powder serious pollution, the armature of the speed measuring motor is also contaminated and cleaned the normal 7M 47 servo system alarm: "07" check the servo board, no alarm, three-axis alarm, check the PC parameters of the PC parameters are all lost, the battery Poor contact compensation parameter, repair battery 7M 48 vibration mechanical inspection on Y axis - speed loop - position loop - X, Y exchange comparison - check GN7.12 board C38 (LM301) component performance problem replacement 7CT 49 Z axis servo motor overheating Z-axis load is too heavy: 1. The stringer is too tight 2. The guide rail is scratched due to lubricant discomfort during the test machine, resulting in the replacement of domestic rail 46 # hydraulic oil, using Whetstone fine-grinding scar, so that the track scar is lower than the guide rail surface 0.02 -0.05 9 50 Z-axis oscillation noised tea product and related transmission gear. Adjust the No.23 parameter counterweight misalignment adjustment servo unit negative feedback amount 7M 51 Work length five law, error 2mm Check machine tool, servo system is used for Z-axis origin switch bad repair 2000C 52 Z-axis motor shakes quickly, servo alarm check servo motor and speed control unit Z-axis oil, toner is full, commutator De-welding, welding, cleaning 2000C 53 Servo is not ready to check the switch position, NC, PC parameters, check the SV power output SV power supply damage, replace the power supply 3MA 54 feed size is not stable, check the servo speed loop given value is not uniform, adjust the 3T 55 Incremental value of the position value is not stable. Parameter error protection. Power failure protection. Power supply repair. 3T 56 Servo alarms. Check the servo unit's circuit discharge. Transistor breakdown. Transistor 6 57 Thread thread taper is not required. Servo motor 3, Servo control system Improper assembly of servo motor and ball screw Take off the servo motor and reassemble the 6T-C 58 machine tool with a screw. The servo will check the servo unit and the thyristor self-igniting SCR. Loose screw at the output end, poor contact cleaning, tightening screws, failure disappears 7M 59 memory alarm device is damaged change plate 3 60 tape input, odd-numbered holes can be input, even holes reported The police tape was tested normally on other machine tools. Check ALM,TV=1,Punch belt error,Machine data destruction,Re-adjust data 5T
16 When running the program, the machine suddenly stops moving, and the alarm is repeated. Check the cause of the alarm. The +LX signal disappears instantly. Adjust and tighten the signal plug. 3TA 17 Tool change stops. Alarm No. 99 checks tool alignment with the spindle cone. Hole condition stopper detection switch is loose, the computer does not detect the height of the tool rise re-fixed stopper detection switch 3MC 18 machine tool table can not act to control the hydraulic circuit board in a solid state relay damage external power supply 10500V transformer broken The phase fuse is changed to single-phase. The other solid state relay with no function used on the control circuit board is removed and replaced with 6M. 19 The machine tool table can not be operated. The solid state relay of the control hydraulic valve is normal, but the indicator light of the hydraulic valve is off. Push the hydraulic valve core, the small circuit board in the movable valve of the movable table in the worktable Welded to open the hydraulic valve, take out the small circuit board and weld it well 6M 20 The robot can't move before the sudden power failure. The robot's tool change instruction has been read in due to power outage. The manipulator did not perform any action. After the external power supply was restored, the tool change command was not reset. The power supply was suddenly turned off by the manipulator. The hydraulic valve of the hand pushes the normal direction of the robot to 6M
21 The spindle is not braked. When the brake function is executed, the spindle vibration checks the brake circuit. The spindle control device components are damaged. Replace the components. 6MB 22 The inverter controller does not work. Check the NC fault, the PLC interface is faulty, the inverter controller itself is faulty. PLC interface Failure, resulting in loss of power repair PLC interface 17# board 6TB 23 CNC cabinet can not start ZK master switch, all other parts are normal ZK master switch current relay has a phase burnout repair relay 6M 24 did not reach the reference point, the occurrence of overtravel, intermittent Check whether the check parameters are correct, check the limit switch of the limit switch for overtravel limit switch; when the operator maintains the machine tool, move the limit switch repair limit switch, change the parameter of travel limit to a larger value, and open the machine tool. Go to the reference point, press the limit switch, and then change back to the original setting parameters. 3MC 3MA 25 Table Y does not have a rapid or no deceleration process when returning to the reference point. Sometimes the Y-axis moves to the center of the stroke range and the overtravel alarm limit is sent. Parameter and peripheral circuit parts Y-axis limit combination switch has problems, connection and contact corrosion rust, disconnection clearance limit switch 3M
26 The system has no alarm, and the Y-axis zero point return is completed. When it reaches the end of a certain block, the program stalls. The next block does not check the signal of each part. Check the external environment system overheating and cooling 6MB 27 Z-axis cannot be returned to zero. Zero Principles and Methods Z-axis Low-speed Movement Decreased Adjusting the Drive System 6M 28 When the program is running, the tool table plungs forward and goes to the overtravel alarm to check the CNC system. Check programming programming error. One program has a decimal point less 6T-C 29 Fast Positioning, Z axis shakes up and down, no alarm check amplification is too large, check plus / deceleration time too short acceleration / deceleration time is too short to adjust the compensation capacitance on the servo board amplifier, increase the capacitance, normal 6 30 machine random walk Internal procedures, unclear to re-send the program, normal 7
31 Y-axis overtravel, emergency stop alarm, machine lock check the switch position, parameters, check the parameter protection switch is not locked because the parameter switch is not locked, wrong signal trigger re-enter the parameter, lock 7CM 32 magazine entry and exit impact Travel switch solenoid valve action is not reliable working environment is not good, solenoid valve maintenance cycle is long, the poor quality of the device pay attention to the usual maintenance 3M 33 regardless of manual or automatic state, can not find the No. 3, No. 4 tool connection tool location detection tool change Encoder PC PC E5B and E4B (SN75463) burned out Replace the 75463 driver block 3T-F 34 The tool changer did not pull the knife to check the LS12 switch, check the PC screen 46.2 parameter switch disconnection, the signal did not feed back to the PC weld wire 6M 35 Tool number Can't write in, read/write status is inconsistent. Display: address 00,01,02,03,04,05,...17,18,19; tool number 01,01,03,03,05,05,...17,17,19,19; tool magazine zero generation Alarm, using the T command, single 09 alarm, double 10 alarm. Analyze the logic circuit diagram, the memory random tool control part, check the RA, and from the control end of the chip, when the write state is found, WE remains high and always in read state. B6 has long been replaced. Check B6. The output signal of the previous stage is normal. The fault may be between B6 and the previous stage. The PC 03 board has dummy solder joints. Excluding solder joints 7
36 Positioning tool magazine zero return is not allowed. Observe the zero return status of the tool magazine. Check the travel switch. The travel switch is released in advance after deceleration. It does not enter the positioning area and causes forward or backward to the nearest zero point to make positioning inaccurate. Directional stop moves. Adjust the positioning stop 7 37 CRT display tool code only allows single number write, tool magazine zero return 09 alarm check the control of the RAM on the PC; check even coding of the cutter code disk C1; check B2, D3, D4; check RAMA49 terminal, 10 terminal; check D5 comparator 10 terminal and 9 terminal is not the same, 9 terminal is at a high level on the printed circuit board with a breakpoint to clear the breakpoints 7 38 manual, automatic tool exchange when the tool sleeve no action, and spindle orientation After the magazine returns to zero, the relevant indicator light is off. Check solenoid valve PDNT, no action; relay, PDNJ no action; check PC send signal, RO724 non-response machine output PC signal does not meet the requirements of the knife sleeve movement, robot 180° return travel switch position adjustment inductive travel switch position Signal 7 39 The tool magazine does not rotate, does not return to the reference point, does not turn the first check the limit switch does not press the travel switch to help press the switch 7M 40 01 alarm check panel, LED light check coupling circuit F1F2F3 blown fuse 7M
41 Automatic tool change operation. After the tool case is down, the spindle moves downwards at the same time to check the PC board. 20ms The clock generator is damaged. Replace the fuse 7M 42 Tool compensation error. Check the old program correctly, and the new program is correct. The tool compensation software EPROM is damaged. Replace EPROM 7CM 43 tool change can not be normal to check the PC, go to the ladder diagram to determine the connection to check the bad connection to reconnect the line 11M 44 Z axis servo system can not work, easy to burn Z axis 30A fuse check the servo system (including replacement speed Adjustment unit printing plate) SCR turns off unsuccessfully in small signal Replace SCR 7CM 45 Y-axis oscillation check servo system, find TACH damaged speed-measurement motor rotor open change speed motor rotor 7CM
46 Y-axis servo board alarm: "07" speed control unit is not ready to check according to the instructions, all normal. Check the motor armature carbon brush powder serious pollution, the armature of the speed measuring motor is also contaminated and cleaned the normal 7M 47 servo system alarm: "07" check the servo board, no alarm, three-axis alarm, check the PC parameters of the PC parameters are all lost, the battery Poor contact compensation parameter, repair battery 7M 48 vibration mechanical inspection on Y axis - speed loop - position loop - X, Y exchange comparison - check GN7.12 board C38 (LM301) component performance problem replacement 7CT 49 Z axis servo motor overheating Z-axis load is too heavy: 1. The stringer is too tight 2. The guide rail is scratched due to lubricant discomfort during the test machine, resulting in the replacement of domestic rail 46 # hydraulic oil, using Whetstone fine-grinding scar, so that the track scar is lower than the guide rail surface 0.02 -0.05 9 50 Z-axis oscillation noised tea product and related transmission gear. Adjust the No.23 parameter counterweight misalignment adjustment servo unit negative feedback amount 7M 51 Work length five law, error 2mm Check machine tool, servo system is used for Z-axis origin switch bad repair 2000C 52 Z-axis motor shakes quickly, servo alarm check servo motor and speed control unit Z-axis oil, toner is full, commutator De-welding, welding, cleaning 2000C 53 Servo is not ready to check the switch position, NC, PC parameters, check the SV power output SV power supply damage, replace the power supply 3MA 54 feed size is not stable, check the servo speed loop given value is not uniform, adjust the 3T 55 Incremental value of the position value is not stable. Parameter error protection. Power failure protection. Power supply repair. 3T 56 Servo alarms. Check the servo unit's circuit discharge. Transistor breakdown. Transistor 6 57 Thread thread taper is not required. Servo motor 3, Servo control system Improper assembly of servo motor and ball screw Take off the servo motor and reassemble the 6T-C 58 machine tool with a screw. The servo will check the servo unit and the thyristor self-igniting SCR. Loose screw at the output end, poor contact cleaning, tightening screws, failure disappears 7M 59 memory alarm device is damaged change plate 3 60 tape input, odd-numbered holes can be input, even holes reported The police tape was tested normally on other machine tools. Check ALM,TV=1,Punch belt error,Machine data destruction,Re-adjust data 5T
61
Loss of parameters, programs, parity alarms
1, the parameters and program registers due to loss of power can make the information lost; 2, check the register chip
Battery connector is sometimes left unconnected
Improved battery concatenation
5T
62
416, 426 alarm
Replace pulse encoder, alarm disappears
The environment is too humid
Fix the encoder
6M
63
414 alarm
Missing Sin signal
Device damage
Replace A20B-0008-0461 pull
6T
64
System 86 alarm
Check RS-232 failure, there may be a problem with the interface
Interface hardware failure
Repair device
6MB
65
System 901 alarm
Magnetic bubble memory board
Data line failure
Core change
6MB
66
AC spindle 13 alarm
Check each component signal, check spindle control device
Component damage
Replace components
6MB
67
Alarm number 1000, AC servo AL-17, AL-18 alarm
The input voltage is too high (450V) and the regulator automatically fails
Replace spare parts
6CM
68
Spindle servo main circuit fuse and alarm fuse are all blown during normal processing
Check the spindle servo board unit and related connection section
SCR all the way to failure
Replace spindle servo unit
3TA
69
Z axis encoder A·/A, B·/B signals are all absent
Check the inverter in the encoder
Inverter is damaged
Combine with 7404 to generate A·/A, B·/B signals
3TA
70
System cannot start
Check the NC cabinet and the main PCB board connector plug, check the PCB board input interface and output interface
Short circuit of M18, produced in the machine measuring box
Handle short circuit
3T-F
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