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FANUC spindle drive alarms serve as indicators of potential issues within CNC machines. They help identify issues related to spindle motor, drive unit or communication errors – understanding these FANUC Spindle Alarm List entries can help significantly decrease downtime while increasing machine efficiency.
In this guide, we will detail how FANUC spindle alarms are displayed and provide a complete FANUC Spindle Alarm List as well as troubleshooting solutions. At the end of this article, a PDF with this list can also be downloaded for future reference.
FANUC spindle drive alarms appear in a specific manner that operators need to observe carefully.
FANUC spindle drives feature a numeric display panel alongside three LED indicators. The combination of the LED indicators and the numbers on the display helps identify alarm and fault conditions.
Since spindle faults do not trigger messages in the system, operators must always check the numeric display on the spindle drive and the LED indicator status when the spindle is not functioning correctly.
Display Status | Alarm Content |
“XX” | Power on for 1 second, digital display spindle software series number after two “9D50” |
“YY” | Power on for 1 second, then continue to display the spindle software version number “04” |
“□” | SPM Power Supply Failure |
“–“ | SPM waiting for communication to be established |
“00” | Spindle Motor excitation |
“Number” + Red Light | Digital + red light, spindle unit alarm |
“Number” + Yellow Light | Digital + yellow light, spindle unit warning |
Below is a list of common FANUC Spindle Alarm Codes along with their possible causes and troubleshooting methods.
The internal motor reaches above the temperature index.
(1) When this alarm is displayed during cutting (high motor temperature)
(a) Check the cooling status of the motor.
(i) If the spindle motor cooling fan stops, check the cooling fan power supply and replace it if it cannot be repaired.
(ii) For liquid-cooled motors, check the cooling system.
(iii) If the ambient temperature of spindle motor is higher than the target, make improvements.
(b) Please reconfirm the processing conditions.
(2) When this alarm is displayed under light load (high motor temperature)
(a) For frequent acceleration/deceleration, set the average including the output during acceleration/deceleration to the operating conditions below the continuous rating.
(b) The motor intrinsic parameters are not set correctly. Refer to the FANUC AC SPINDLE MOTOR αi series Parameter Sheet (B-65280CM) to check the motor intrinsic parameters.
(3) When the motor temperature is low and an alarm is displayed
(a) Bad spindle motor feedback cable: Replace the feedback cable.
(b) Parameters have not been set correctly: Please confirm the parameters.
Parameters | Content |
4134 | Set value 110 (standard specification) Set value 130 (high-speed spindle specification) |
(c) Bad control printed circuit board: Replace the control printed circuit board or spindle amplifier .
(d) Bad motor (internal temperature sensor): Replace the motor.
There is a large difference between the motor speed and the commanded speed.
(1) When this alarm is displayed during motor acceleration
(a) Inappropriate time parameter setting during acceleration/deceleration
Set the following parameters with an allowance for acceleration/deceleration times compared to the actual equipment.
Parameters | Content |
4082 | Set value 2 (Time setting in acceleration/deceleration) |
(b) Incorrect setting parameters of the speed detector
(2) This alarm is displayed when re-cutting.
(a) The cutting load exceeds the maximum output of the motor
Check the display of the load table and modify the usage conditions.
(b) Incorrectly parameterized output limits
Please make sure that the following parameters are consistent with the specifications of the machine and motor.
Parameters | Content |
4028 | Set value 0 (output limit mode setting) |
4029 | Set value 100 (output limit value) |
(c) Incorrect setting of motor intrinsic parameters
Check the motor intrinsic parameters.
Click here to view the repair case of this alarm.
The fuse in the DC link section has blown. (Insufficient voltage in DC link section) This alarm is checked when the emergency stop is released.
(1) When an alarm occurs during spindle operation (rotation)
It is likely that the DC link portion of the SPM fuse has dissolved, replace the SPM. In addition, this alarm can be caused by the following:
(a) Power line ground fault
(b) Motor winding ground fault
(c) IGBTs and IPM modules are defective
(2) When the emergency stop is canceled or when the PSM input solenoid contactor opens at the time of CNC startup and then closes due to this alarm (or does not close when the spindle is connected to 2 axes).
(a) DC link section wires are not connected
Make sure that the DC link is connected correctly.
(b) Dissolution of the DC link section insurance in the SPM
Please replace the SPM.
Abnormal temperature sensor or broken temperature sensor cable.
(1) Incorrect setting of motor intrinsic parameters
Check the motor intrinsic parameters.
(2) Bad cables
Bad feedback cable.
Please replace the cable.
(3) Control Printed Circuit Board Failure
Replace the control printed circuit board or spindle amplifier.
(4) Abnormal temperature sensor
Please replace the motor (temperature sensor).
The motor rotates over 115% of the maximum speed (parameter standard setting).
(1) Occurs during spindle synchronization
During spindle synchronization, when the excitation (SFR, SRV) of a single side motor is turned off and then turned on again, the spindle motor may be accelerated in order to eliminate the positional error gathered in the middle of this
The maximum speed is reached and the alarm is raised.
(2) SPM Failure
Please replace the SPM.
Spindle amplifier module main circuit heat sink temperature is abnormally high.
(1) When this alarm is displayed during cutting (high temperature of heat sink)
(a) If the load meter alarms below the continuous rating of the amplifier, check the cooling status of the heat sink.
(i) Check the power supply (connector CX1A/B) when the cooling fan stops, and replace the SPM if it cannot be repaired.
(ii) If the ambient temperature exceeds the specification, make improvements.
(b) If the load meter alarms above the continuous rating of the amplifier, improve the method of use.
(c) If the heat sink on the back of the amplifier is dusty, clean it by blowing air. The structure should be studied so that the heat sink section does not come into direct contact with cutting oil, etc.
(2) When this alarm is displayed under light load (high temperature of heat sink)
(a) Frequent acceleration/deceleration
Including the output portion during acceleration/deceleration, use the operating conditions where the average value is below the continuous rating.
(b) Incorrect setting of motor intrinsic parameters
Check the motor intrinsic parameters.
(3) Control substrate mounting problems
Please press the panel effectively (this alarm may be issued when the connector connecting the control substrate to the power substrate is deviated).
(4) When an alarm is displayed when the temperature of the heat sink is low
Please replace the SPM.
The DC portion of the main circuit (DC link) has excessive current.
In SPM-11i, an abnormality is detected in the power (IPM) of the main circuit. The abnormality consists of excessive current or overload.
(1) When this alarm is displayed on the SPM-11i, the following information is displayed.
Check the contents of alarm code 09 as well.
(2) Control substrate mounting problems
Please press the panel effectively (this alarm may be issued when the connector connecting the control substrate to the power substrate is deviated).
(3) When an alarm occurs just after a spindle rotation command is given
(a) Bad motor power cables: Make sure there are no short circuits or ground faults between the motor power cables, and replace the power cables if necessary.
(b) Poor motor insulation: Replace the motor if it has a ground fault.
(c) Incorrect motor intrinsic parameter setting: Check the motor intrinsic parameters.
(d) Defective SPM: The power components (IGBT, IPM) may be damaged. Please replace the SPM.
(4) When an alarm occurs during spindle rotation
(a) Damaged power components: The power components (IGBT, IPM) may be damaged. Please replace the SPM.
Power components may be damaged when cooling is inadequate due to dust accumulation in the heat sink section of the amplifier.
If the heat sink section on the back of the amplifier is dusty, clean it by blowing air. The structure should be studied so that the heat sink part does not come into direct contact with cutting oil, etc.
(b) Incorrect motor intrinsic parameter setting: Check the motor intrinsic parameters.
(c) Abnormalities in the speed sensor signal: Check the signal waveform of the spindle sensor, and if there is any abnormality, make adjustments or replace the detecting part.
The program for the switching operation of the output switching control or spindle switching control is not executed correctly.
The time from the change of the switching request signal (SPSL or RSL) to the change of the power line status confirmation signal (MCFN, MFNHG, or RCH, RCHHG) is more than 1 second.
When the alarm occurs.
(1) Troubleshooting when an alarm occurs
(a) Poor surrounding of electromagnetic contactor (switching device) for power line switching
If the contact does not work, check the power supply of the electromagnetic contactor and replace it if it cannot be repaired.
(b) Poor wiring or I/O device for electromagnetic contactor contact recognition
If you find a problem, please replace it.
(c) Errors in the program (ladder diagram)
Please perform the process so that the switchover can be completed within 1sec.
Sums checksum exception.
Replace the SPM or SPM control printed circuit board when an alarm occurs.
Offset voltage of U-phase (alarm code 19) and V-phase (alarm code 20) current detection circuits is too large. Check when power is turned on and input.
Replace the SPM when the alarm occurs. verify the insertion of the connector between the power unit and the SPM control printed circuit board when it occurs just after replacing the SPM control printed circuit board.
The position sensor polarity is not set correctly.
Troubleshooting when an alarm occurs
(a) Check the polarity parameter of the position sensor (No.4001#4).
(b) Verify the connection of the position sensor feedback cable.
There is an abnormality in the serial communication data between the CNC and the spindle amplifier module. (Note)
Troubleshooting when an alarm occurs
(a) Noise between the CNC and spindle amplifier modules (connected by cables) causes abnormal communication data.
Check the conditions regarding the maximum connection length.
Confirm the conditions under which a cable connection can be made.
(b) Noise will be affected when communication cables are tied together with power lines
If there are parts that are tied together with the motor power cord, tie them separately.
(c) Bad cable: Replace the cable.
When using the Optical Port I/O Connection Adapter, it is possible that the Optical Port I/O Connection Adapter or the fiber optic cable is bad.
(d) Defective SPM: Replace the SPM or SPM control printed circuit board.
(e) Defective CNC: Replace the board or module associated with the serial spindle.
Note: This alarm is also displayed when the CNC power supply is cut off, but this is not an abnormality.
The alpha position encoder signal is disconnected.
(1) Alarm occurs when motor excitation is turned off
(a) Incorrect parameterization
Check the sensor setting parameters.
(b) Cable breaks
If the feedback cable is not connected correctly, replace the cable.
(c) SPM non-performance
Replace the SPM or SPM control printed circuit board.
(2) Alarm occurs when the cable is touched
(a) Poor connector contact or cable breakage
The wire may be broken, replace the cable. If there is cutting oil intruding into the connector part, clean it.
(3) Alarm occurs during motor rotation
(a) Poor cable shielding between the sensor and the SPM
Check the shielding treatment of the cable.
(b) Tied to the servo motor’s power cable
If the cable from the sensor to the SPM is tied to the servo motor power cable, tie them separately.
Excessive load (9V or more on the load meter) has been applied for a certain period of time (30 seconds is standard).
(1) When an alarm occurs during the cutting process
Please check the load table and study the cutting conditions.
(2) When an alarm occurs during stopping
(a) The spindle is locked.
Check the program to see if the spindle is locked when a directional command or a very low speed command is sent to the spindle.
(3) When an alarm occurs due to non-commanded rotation (very low speed rotation)
(a) Incorrect parameter setting: Check the sensor setting parameters.
(b) Wrong phase sequence of motor power line
(c) Wrong motor feedback cable: Make sure the A/B signal is not reversed.
(d) Bad motor feedback cable
Rotate the motor by hand, and check whether the speed is displayed on the motor speed or spindle inspection board in the diagnostic screen of the CNC. If the speed is not displayed, change the speed.
Change the cable or spindle sensor (or motor).
(4) When an alarm occurs due to failure to rotate as instructed (no rotation at all)
(a) Abnormalities in power lines
Make sure the motor power cable is connected correctly. Make sure that the electromagnetic contactor is open when switching the spindle or winding.
(b) Defective SPM: Replace the SPM.
Instead of rotating at the commanded speed, the motor stops, or rotates at a very low speed.
(1) Very low speed rotation, in the event of an alarm
(a) Incorrect parameter setting: Check the sensor setting parameters.
(b) Incorrect motor phase sequence: Verify that the motor phase sequence is not incorrect.
(c) Wrong motor feedback cable: Make sure the A/B signal is not reversed.
(d) Defective motor feedback cable: Rotate the motor by hand and check whether the speed is displayed on the motor speed in the diagnostic screen of the NC or on the spindle inspection board. If the speed is not displayed, replace the
Cable or spindle sensor (or motor).
(2) No rotation at all, in case of an alarm
(a) Incorrect program to lock the spindle: Verify that the program locks the spindle.
(b) Bad power cable: Make sure the motor power cable is connected correctly. Make sure the solenoid contactor is open when switching spindle and output.
(c) Defective SPM: Replace the SPM.
There is an abnormality in the memory of the LSI for serial communication. Check when the power is turned on.
When an alarm occurs, replace the SPM or SPM control printed circuit board.
Parameter data outside the tolerance range is set.
Troubleshooting when an alarm occurs
Please connect the spindle inspection plate.
On the spindle inspection plate
“AL-34” and “F-xxx” are displayed alternately, and “F-xxx” indicates a parameter number outside the tolerance range. For the correspondence between the parameter number of CNC and “F-xxx”, refer to the following table
FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280CM).
Error counter overflow.
(1) Incorrect parameter setting
(a) Incorrectly parameterized gear ratios
Check that the gear ratio data has not been incorrectly set to a value that is too large.
(b) Incorrect position gain setting
When the gear ratio data is correct, increase the value of the position gain.
Parameters | Content |
4056~4059 | Gear ratio data of spindle and motor |
4060~4063 | Position gain in orientation position |
4065~4068 | Position gain in servo mode/spindle synchronous control |
4069~4072 | Position gain during Cs contour control |
(2) Procedural errors
(a) Check that the motor excitation is off (SFR/SRV off) in the position control mode (rigid tapping, Cs contouring control, spindle synchronization control).
When the emergency stop signal is input, the motor accelerates instead of decelerating. After an emergency stop signal is input, the motor is excited after an acceleration/deceleration time (initially set to 10 seconds).
It also occurs when the magnetism is not cut off (deceleration is not completed).
Troubleshooting when an alarm occurs
(a) Incorrect setting of speed detector parameters
Please set the correct value.
(b) Unreasonable parameterization of acceleration and deceleration times
Check the parameter setting and the actual deceleration time, and set a value that has a margin for the actual deceleration time.
4082 Set value 2 (Time setting in acceleration/deceleration)
The rotation 1 cycle signal of the α position encoder generates a position error.
Troubleshooting when an alarm occurs
(a) Incorrect parameterization
Check the sensor setting parameters.
(b) Bad α position encoder
Observe the Z signal of the position encoder and replace the position encoder if no signal is generated for every 1 revolution.
(c) Poor shielding of the cable between the sensor and the SPM
Check the shielding treatment of the cable.
(d) Tied to the servomotor power cable
If the cable from the sensor to the SPM is tied to the servo motor power cable, tie them separately.
(e) SPM failure
Replace the SPM or SPM control printed circuit board.
The alpha position encoder does not generate a per revolution signal.
Troubleshooting when an alarm occurs
(a) Incorrect parameterization
Check the sensor setting parameters.
(b) Bad α position encoder
Observe the check pin PSD on the spindle inspection board and replace the connecting cable, position encoder if it does not send a signal per revolution.
(c) SPM non-performance
Replace the SPM or SPM control printed circuit board.
The position detector did not correctly detect the per-turn signal during thread cutting operation.
Refer to Alarm Code 41 for troubleshooting this alarm.
The pulse count value of the α position encoder signal is abnormal.
The A and B phases of the position encoder have a return pulse count of 4096 p/rev for each revolution of the spindle, and the SPM checks the pulse counts of the A and B phases of the position encoder when generating the signals for each revolution.
Punch counts and an alarm occurs if it is not within the specified range.
(1) Alarm occurs when the cable is touched (spindle movement, etc.).
The wire may be broken, replace the cable. If there is cutting oil intruding into the connector part, clean it.
(2) Troubleshooting in other cases
(a) Incorrect parameterization
Check the sensor setting parameters.
(b) Poor cable shielding between the sensor and the SPM
Check the shielding treatment of the cable.
(c) Tied to the servo motor power cable
If the cable from the sensor to the SPM is tied to the servo motor power cable, tie them separately.
(d) SPM non-performance
Replace the SPM or SPM control printed circuit board.
Internal calculation processing during spindle synchronization control exceeded the tolerance value.
Troubleshooting when an alarm occurs
(a) Poor gear ratio parameterization
Check that the gear ratio data has not been incorrectly set to a value that is too large.
(b) Setting limits for position gain
When the gear ratio data is correct, reduce the value of the position gain during spindle synchronization.
4056 to 4059 Gear ratio data for spindle and motor
4065 to 4068 Position gain in servo mode/spindle synchronous control
The synchronization signal (ITP) stops in the communication data with the CNC.
Troubleshooting when an alarm occurs
(a) SPM non-performance
Replace the SPM or SPM control printed circuit board.
(b) CNC defective
Please replace the serial spindle related board or module.
Higher current flowing through the motor for a long time is detected.
Refer to Alarm Code 29 for troubleshooting this alarm.
In spindle switching control or output switching control, the switching request signal (SPSL or RSL) and the power line status confirmation signal (MCFN, MFNHG, or RCH, RCHHG) during motor excitation do not coincide continuously.
Troubleshooting when an alarm occurs
(a) Poor surrounding of electromagnetic contactor (switching device) for power line switching
If the contact does not work, check the power supply of the electromagnetic contactor and replace it if it cannot be repaired.
(b) Poor wiring or I/O device for electromagnetic contactor contact recognition
If you find a problem, please replace it.
(c) Errors in the program (ladder diagram)
Please correct the program and do not switch during excitation.
The cooling fan of the control circuit section stops.
(a) Control substrate mounting issues
Please press the panel effectively (this alarm may be displayed when the connector connecting the control substrate to the power substrate is deviated).
(b) Replace the SPM or replace the SPM’s internal cooling fan.
Communication between spindle amplifiers (connector JX4) is abnormal.
Troubleshooting when an alarm occurs
(a) Please confirm the connection.
(b) Please replace the cable.
This alarm only occurs when using the double-check security .
The spindle motor speed exceeds the safe speed in safety signal mode C (state in which the protective device is turned on by inputting a request for the protective device to be turned on).
Troubleshooting when an alarm occurs
(a) When the protective device is on, operate within the safe speed range.
(b) Please check the safe speed parameters.
(c) Replace the SPM control printed circuit board.
This alarm only occurs when using the double-check security .
The connection status of the spindle amplifier does not correspond to the setting of the hardware.
Troubleshooting when an alarm occurs
(a) Check the connection and setting of SPM.
(b) Replace the control printed circuit board of the CPU card or SPM.
This alarm only occurs when using the double-check security .
An abnormality occurred in a safety parameter.
Troubleshooting when an alarm occurs
(a) Please reset the safety parameters.
(b) Replace the control printed circuit board of the CPU card or SPM.
This alarm only occurs when using the double-check security .
The spindle amplifier speed detection judgment result does not match the CNC speed detection judgment result.
If an alarm occurs, replace the CPU card of the CNC or the control printed circuit board of the SPM.
Motor sensor signal disconnected.
(1) Alarm occurs when motor excitation is turned off
(a) Incorrect parameterization
Check the sensor setting parameters.
(b) Cable breaks
Please replace the cable.
(c) Poor sensor adjustment
Adjust the sensor signal. If adjustment is not possible, or if the signal cannot be observed, replace the connecting cable and sensor.
(d) SPM non-performance
Replace the SPM or SPM control printed circuit board.
(2) Alarm occurs when the cable is touched (spindle movement, etc.).
The wire may be broken, replace the cable. If there is cutting oil intruding into the connector part, clean it.
(3) Alarm occurs during motor rotation
(a) Poor cable shielding between the sensor and the SPM
Check the shielding treatment of the cable.
(b) Tied to the servo motor’s power cable
If the cable from the sensor to the SPM is tied to the servo motor power cable, tie them separately.
This alarm only occurs when double-check safety is used.
The CPU test did not end properly.
When an alarm occurs, replace the SPM or SPM control printed circuit board.
This alarm only occurs when double-check safety is used.
An exception occurred in the CRC test.
When an alarm occurs, replace the SPM or SPM control printed circuit board.
This alarm only occurs when double-check safety is used.
The safety function of the spindle amplifier has not been implemented.
When an alarm occurs, replace the control printed circuit board of the SPM.
This alarm only occurs when double-check safety is used.
The spindle number check result of the spindle amplifier does not match the spindle number check result of the CNC.
If an alarm occurs, replace the CPU card of the CNC or the control printed circuit board of the SPM.
This alarm only occurs when double-check safety is used.
The test results of the safety parameters of the spindle amplifier do not correspond to the test results of the safety parameters of the CNC.
If an alarm occurs, replace the CPU card of the CNC or the control printed circuit board of the SPM.
This alarm only occurs when double-check safety is used.
The initial test works abnormally.
When an alarm occurs, replace the SPM or SPM control printed circuit board.
There is an error in the part of the motor sensor where the signal per revolution occurs.
(1) When using external per-rotation signals
(a) Errors in parameters
Verify that the gear ratio data is consistent with the machine specification.
CNC parameter contents
No. 4171, No. 4173 Any gear ratio between motor sensor and spindle
No. 4172, No. 4174 Arbitrary gear ratio numerator between motor sensor and spindle
(b) Sliding between spindle and motor
Make sure there is no slippage between the spindle and the motor. An external per revolution signal cannot be applied to the V-belt union.
(2) Troubleshooting in other cases
(a) Incorrect parameterization
Check the sensor setting parameters.
(b) Poor sensor adjustment (BZi, MZi sensors)
Adjust the sensor signal. If adjustment is not possible, or if the signal cannot be observed, replace the connecting cable and sensor.
(c) Poor cable shielding between the sensor and the SPM
Check the shielding treatment of the cable.
(d) Tied to the servomotor power cable
If the cable from the sensor to the SPM is tied to the servo motor power cable, tie them separately.
(e) SPM failure
Replace the SPM or SPM control printed circuit board.
The motor sensor does not generate the per revolution signal .
Troubleshooting when an alarm occurs
(a) Incorrect parameterization
Check the sensor setting parameters.
(b) Poor sensor adjustment (BZi, MZi sensors)
Adjust the sensor signal. If adjustment is not possible, or if the signal cannot be observed, replace the connecting cable and sensor.
(c) Poor external per-rotation signal
Observe the check pin EXTSC1 on the spindle check board, and replace the connecting cable, proximity switch if it is not generating a signal per revolution.
(d) SPM non-performance
Replace the SPM or SPM control printed circuit board.
The SPM checks the pulse counts of the A and B phases every 1 cycle of signal generation, and an alarm occurs if it is not within the specified range.
(1) Alarm occurs when the cable is touched (spindle movement, etc.).
The wire may be broken, replace the cable. If there is cutting oil intruding into the connector part, clean it.
(2) Troubleshooting in other cases
(a) Incorrect parameterization
Check the sensor setting parameters.
(b) Poor sensor adjustment (BZi, MZi sensors)
Adjust the sensor signal. If adjustment is not possible, or if the signal cannot be observed, replace the connecting cable and sensor.
(c) Poor cable shielding between the sensor and the SPM
Check the shielding treatment of the cable.
(d) Tied to the servo motor power cable
If the cable from the sensor to the SPM is tied to the servo motor power cable, tie them separately.
(e) SPM failure
Replace the SPM or SPM control printed circuit board.
The spindle sensor signal is disconnected.
Refer to Alarm Code 73 for troubleshooting this alarm.
There is an error in the part of the spindle sensor where the signal per revolution occurs.
Refer to Alarm Code 81 for troubleshooting this alarm.
The spindle sensor does not generate a per revolution signal.
Refer to Alarm Code 82 for troubleshooting this alarm.
There is an abnormality in the spindle sensor signal.
Refer to Alarm Code 83 for troubleshooting this alarm.
The radiator cooling fan stops.
When an alarm occurs, replace the SPM radiator cooling fan.
The control program does not work.
An exception is detected in the processing of the control program.
(1) This alarm is displayed when the spindle amplifier is turned on.
(a) Different software specifications
(b) Defective printed circuit boards
Replace the SPM or SPM control printed circuit board.
(2) Alarm during motor excitation
(a) Impact of noise
Check the GND-related wires.
If the signal cable of the spindle sensor is tied to the servo motor power cable, tie them separately.
There is an abnormality in the communication between amplifier modules (SPM, SVM, PSM).
Troubleshooting when an alarm occurs
(1) This alarm is displayed when the power of the CNC has just been turned on.
(a) Check the connection part of the connector.
CXA2A and CXA2B are connected together for the correct state.
(b) Bad cables
Check the connection pin number and correct it if there is a problem.
Please replace the cable.
(c) Poor SPM, SVM or PSM.
Replace the SPM, SVM, PSM or SPM, SVM, PSM control printed circuit board.
There is an abnormality in the serial communication data between the CNC and the spindle amplifier module.
Troubleshooting when an alarm occurs
(a) SPM non-performance
Replace the SPM or SPM control printed circuit board.
(b) CNC defective
Please replace the serial spindle related board or module.
The internal state of the switching circuit (auxiliary module SW) for the switching request signal (SPSL) and motor/spindle sensor signal in spindle switching is not consistent.
Troubleshooting when an alarm occurs
Auxiliary module SW (SSW) failure.
Please replace the auxiliary module SW (SSW).
(1) Alarms 4,11,30,33,51,57,58,b1,b2,b3 occur in the SPM status display.
Indicates that an alarm has occurred in the PSM. Check the status display of the PSM and refer to item II.3.1 (B-85285CM).
(2) CNC Alarms 756 and 766 (Axis number abnormality)
This alarm occurs only when the double check safety function is used. When this alarm occurs, verify that K76, shown below, is mounted on connector JA7A of the 2nd spindle.
On. If it is only the 1st spindle, K76 is not required. replace the control PCB of the SPM if there is no problem with the wiring.
Looking for more details on FANUC spindle drive alarm? We have compiled a list of FANUC spindle amplifier alarm codes, fault causes and solutions.
Download FANUC Spindle Alarm List
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How we process your repair requirements
Get in touch with us and provide as much detail as possible about the issue you are experiencing.
Our professional repair team will help assess the severity of the problem and the possibility of repair.
The customer sends or delivers the servo drive to our company. We register it in our system and prepare it for further inspection.
Our engineers diagnose the fault points of the servo drive and provide a detailed inspection report, including the final repair cost and estimated repair time.
We provide the repair quote to the customer and wait for their confirmation. If the customer agrees to the quote, we proceed with the repair.
Upon customer approval, we carry out the necessary repairs. After repairs are completed, we perform tests with the motor and conduct aging tests to ensure the servo drive operates reliably under various conditions. Once the testing is successful, we register the drive for delivery.
The customer completes the payment, and we deliver the repaired servo drive to the customer.
We provide attentive follow-up service to ensure customer satisfaction and address any further needs.
