Thanks for the DC Servo fault list, should be a big help.

Thanks for the Fault Listing!

Nice Job with the Fanuc fault list!

Nice work on the A06B Faults!

Looks good! "FANUC Spindle Faults, Alarms, and Errors"

Here is a list of Fanuc alarms for the A06B-6047-*. DC Servo stuff for your DC problems. The DC axis faults are nagging problems sometimes, hopefully this helps with A06B troubleshooting.
 
(Some applicable part numbers: A06B-6047-H003, A06B-6047-H203, A06B-6047-H041, A06B-6047- H201, A06B-6047- H208, A06B-6047-H001, A06B-6047- H005, A06B-6047- H004, A06B-6047- H040)

• What is NC Fault on Fanuc 6047? It means: Overload The Overload alarm occurs if the motor current exceeds the current required to actuate the thermal relay. Or if the power transformer thermostat or the regenerative discharge unit thermostat operates
  
  
• What is TGLS Fault on Fanuc 6047? It means: Tacho Generator   The Motor speed exceeds the specified upper limit due to a break in in the velocity feedback wire, the TGLS indicator goes on. The motor is stopped by the dynamic brake.
  
  
• What is OVC Fault on Fanuc 6047? It means: Over Current The Motor current exceeds the specified upper limit for more than the fixed period ( about 600 msec), the OVC indicator goes on. The motor is stopped by the dynamic brake.
  
  
• What is BRK Fault on Fanuc 6047? It means: Circuit Breaker The Abnormal current exceeding the rating limit of the breaker is applied to the motor, the circuit breaker operates. The motor is stopped by the dynamic brake.
  
  
• What is HVAL Fault on Fanuc 6047? It means: Over Voltage The AC input voltage applied to the servo transformer  exceeds the allowable value, the HVAL indicator goes on.  The motor is stopped by the dynamic brake.
  
  
• What is HCAL Fault on Fanuc 6047? It means: Low Voltage The AC power source voltage drops abnormally, the LVAL indicator goes on. The motor is stopped by the dynamic brake.
  
  
• What is DCA Fault on Fanuc 6047? It means: DC IssueThere is Abnormal current applied to the transistor bridge circuit, the HCAL indicator goes on. The motor is stopped by the dynamic brake.
  
  

Series 0 Servo Faults and Alarm Codes

This is a general list of servo alarms (servo faults) that should be applicable to the following Fanuc series servos: Fanuc 0M-C, Fanuc 0M-F, Fanuc 00M-C, Fanuc 0M-D, Fanuc 0M-F, Fanuc 0M-C, Fanuc 0T-C, Fanuc 0T-F, Fanuc 0T-C, Fanuc 0TT-C, Fanuc 0T-D,  Fanuc 0TT-C, Fanuc 0C, 0-T and 0-M. These servo errors, servo faults, and alarms are not always common, but the whole list is here and hopefully this will help you out.

• Q: What is a Fanuc 400 Alarm code on a 0-T or 0-M? A: SERVO ALARM: 1, 2TH AXIS OVERLOAD : 1-axis, 2-axis overload signal is on.
  
  
• Q: What is a Fanuc 401 Alarm code on a 0-T or 0-M? A: SERVO ALARM: 1, 2TH AXIS VRDY OFF : 1-axis, 2-axis servo amplifier READY signal (DRDY) went off.
  
  
• Q: What is a Fanuc 402 Alarm code on a 0-T or 0-M? A: SERVO ALARM: 3, 4TH AXIS OVERLOAD : 3 axis, 4 axis overload signal is on.
  
  
• Q: What is a Fanuc 403 Alarm code on a 0-T or 0-M? A: SERVO ALARM: 3, 4TH AXIS VRDY OFF : 3-axis, 4 axis servo amplifier READY signal (DRDY) went off.
  
  
• Q: What is a Fanuc 404 Alarm code on a 0-T or 0-M? A: SERVO ALARM: n-TH AXIS VRDY ON : Even though the n-th axis ( axis 1-8) READY signal ( DRDY) is still on. Or, when the power was turned on, DRDY went on even though MCON was off.
  
  
• Q: What is a Fanuc 405 Alarm code on a 0-T or 0-M? A: SERVO ALARM: ZERO POINT RETURN FAULT: Position control system fault.
  
  
• Q: What is a Fanuc 406 Alarm code on a 0-T or 0-M? A: SERVO ALARM: 7, 8TH AXIS OVERLOAD : 7TH, 8TH AXIS VRDY OFF
  7-axis, 8-axis overload signal is on.
  
  
• Q: What is a Fanuc 4n0 Alarm code on a 0-T or 0-M? A: SERVO ALARM: n-TH AXIS -EXCESS ERROR: The position deviation value when the n-th  axis stops is larger than the set value.
  
  
• Q: What is a Fanuc 4n1 Alarm code on a 0-T or 0-M? A: SERVO ALARM: n-AXIS-EXCESS ERROR : The position deviation value when the n-th axis stops is larger than the set value.
  
  
• Q: What is a Fanuc 4n3 Alarm code on a 0-T or 0-M? A: SERVO ALARM: n-th AXIS -LSI OVERFLOW : The contents of the error register for the n-th axis exceeded power.
  
  
• Q: What is a Fanuc 4n4 Alarm code on a 0-T or 0-M? A: SERVO ALARM: n-TH AXIS DETECTION RELATED ERROR : N-th axis digital servo system fault.
  
  
• Q: What is a Fanuc 4n5 Alarm code on a 0-T or 0-M? A: SERVO AALRM: n-TH AXIS- EXCESS SHIFT : A speed higher than 4000000 units/s was attempted to be set in the n-th axis.
  
  
• Q: What is a Fanuc 4n6 Alarm code on a 0-T or 0-M? A: SERVO ALARM: n-TH AXIS -DISCONNECTION : Position detection system fault in the n-th axis pulse coder ( dis-connection alarm).
  
  
• Q: What is a Fanuc 4n7 Alarm code on a 0-T or 0-M? A: SERVO ALARM: n-TH AXIS-PARAMETER INCORRECT : This alarm occurs when the n-th axis is in one of the conditions: 1. The value set in Parameter no 8n20 (motor form) is out of the specified limit.
  2.  A proper value ( 111 or -111) is not set in parameter no 8n22.( motor revolution direction).
  3. Illegal data ( a value below 0, etc) was set in parameter No 8n23 ( number of speed feedback pulses per motor revolution) 4. Illegal data ( a value below 0, etc) was set in parameter No 8n24 ( number of speed feedback pulses per motor revolution) Parameters No. 8n84 and No. 8n85 (flexible field gear rate) have not been set.
  4. An axis selection parameter ( from No.269 to 274 is incorrect.
  5. An overflow occurred during parameter computation.
  
  
• Q: What is a Fanuc 490 Alarm code on a 0-T or 0-M? A: SERVO ALARM: 5TH AXIS OVERLOAD : 5-axis, 6-axis overload signal is on.
  
  
• Q: What is a Fanuc 491 Alarm code on a 0-T or 0-M? A: SERVO ALARM: 5, 6TH AXIS VRDY ON : 5-axis, 6-axis servo amplifier READY signal (DRDY) went off.
  
  
• Q: What is a Fanuc 494 Alarm code on a 0-T or 0-M? A: SERVO ALARM: 5, 6TH AXIS VRDY ON : The axis card ready signal ( MCON) for axes 5 and 6 is off, but the servo amplifier ready signal (DRDY) is not. Alternatively when the power is applied, the DRDY is on and the MCON is not.
  
  
• Q: What is a Fanuc 495 Alarm code on a 0-T or 0-M? A: SERVO ALARM: 5, 6TH AXIS ZERO POINT RETURN : This is a position control circuit error.
  
  

SERIES 0 SYSTEM ALARMS

This is a general list of system alarms for the following Fanuc series controls: Fanuc 0M-C, Fanuc 0M-F, Fanuc 00M-C, Fanuc 0M-D, Fanuc 0M-F, Fanuc 0M-C, Fanuc 0T-C, Fanuc 0T-F, Fanuc 0T-C, Fanuc 0TT-C, Fanuc 0T-D,  Fanuc 0TT-C, Fanuc 0C, 0-T and 0-M. These faults, errors, and alarms are not always common, but the whole list is here and hopefully this will help you out.

• Q: What is a Fanuc 910 Alarm code on a 0-T or 0-M? A: MAIN RAM PARITY : This RAM parity error is related to low-order-by-test.
  
  
• Q: What is a Fanuc 911 Alarm code on a 0-T or 0-M? A: MAIN RAM PARITY : This RAM parity error is related to the low-order bytes..
  
  
• Q: What is a Fanuc 912 Alarm code on a 0-T or 0-M? A: SHARED RAM PARITY :This RAM parity error is related to the low-order bytes of RAM shared with the digital servo circuit..
  
  
• Q: What is a Fanuc 913 Alarm code on a 0-T or 0-M? A: SHARED RAM PARITY : This parity error is related to high-order bytes of RAM shared with the digital servo circuit..
  
  
• Q: What is a Fanuc 914 Alarm code on a 0-T or 0-M? A: SERVO RAM PARITY : This is a local RAM parity error in the digital servo circuit..
  
  
• Q: What is a Fanuc 915 Alarm code on a 0-T or 0-M? A: LADDER EDITING CASSETTE RAM PARITY : This RAM parity error is related to low order bytes of the ladder editing cassette..
  
  
• Q: What is a Fanuc 916 Alarm code on a 0-T or 0-M? A: LADDER EDITING CASSETTE RAM PARITY : This RAM parity error is related to the high order bytes of the ladder editing cassette..
  
  
• Q: What is a Fanuc 920 Alarm code on a 0-T or 0-M? A: WATCHDOG ALARM : This is a watchdog timer alarm or a servo system alarm for axis 1 to 4..
  
  
• Q: What is a Fanuc 921 Alarm code on a 0-T or 0-M? A: SUB CPU WATCH DOG ALARM : This is a watchdog timer alarm related to the sub-CPU board or a servo system alarm for axis 5 or 6..
  
  
• Q: What is a Fanuc 922 Alarm code on a 0-T or 0-M? A: 7/8 AXIS SERVO SYSYTEM ALARM : This is a servo system alarm related to axis 7 or 8..
  
  
• Q: What is a Fanuc 930 Alarm code on a 0-T or 0-M? A: CPU ERROR : Replace the master PC board..
  
  
• Q: What is a Fanuc 940 Alarm code on a 0-T or 0-M? A: PC BOARD INSTALLATION ERROR : PC board installation is incorrect. Check the specification of the PC board..
  
  
• Q: What is a Fanuc 941 Alarm code on a 0-T or 0-M? A: MEMORY PC BOARD CONNECTION ERROR : The memory PC board is not connected securely..
  
  
• Q: What is a Fanuc 945 Alarm code on a 0-T or 0-M? A: SERIAL SPINDLE COMMUNICATION ERROR : The hardware configuration is incorrect for the serial spindle, or a communication alarm occurred..
  
  
• Q: What is a Fanuc 946 Alarm code on a 0-T or 0-M? A: SECOND SERIAL SPINDLE COMMUNICATION ERROR : Communication is impossible with the second serial spindle..
  
  
• Q: What is a Fanuc 950 Alarm code on a 0-T or 0-M? A: FUSE BLOWN ALARM : A fuse has blown.
  
  
• Q: What is a Fanuc 960 Alarm code on a 0-T or 0-M? A: SUB CPU ERROR : This is a sub-CPU error..
  
  
• Q: What is a Fanuc 998 Alarm code on a 0-T or 0-M? A: ROM PARITY : This is a ROM parity error..
  
  

I transposed these Fanuc spindle errors into Q&A style. Not sure if this is any more beneficial than the spindle fault list, but here it is anyway:

• Q: What does Fanuc Spindle Alarm code 01 mean? A:  The inside temperature of the motor is higher than the specified temperature
  
  
• Q: What does Fanuc Spindle Alarm code 02 mean? A:  The actual motor speed is largely deviated from the commanded speed
  
  
• Q: What does Fanuc Spindle Alarm code 03 mean? A:  The fuse of the DC link has blown (The voltage at the DC link is insufficient) This alarm is checked when emergency stop is cancelled.
  
  
• Q: What does Fanuc Spindle Alarm code 06 mean? A:  The temperature sensor is abnormal, or the temperature sensor cable is broken.
  
  
• Q: What does Fanuc Spindle Alarm code 07 mean? A:  The motor rotates at a speed exceeding 115% (standard setting) of the maximum allowable speed.
  
  
• Q: What does Fanuc Spindle Alarm code 09 mean? A:  The temperature of the heat sink of the SPM main circuit has risen abnormally. This alarm is issued for SPM-15i and later with SPM-2.2i to SPM-11i however, Alarm 12 is issued for the same cause.
  
  
• Q: What does Fanuc Spindle Alarm code 12 mean? A:  An excessively large current flowed into the DC link of the main circuit.
  
  
• Q: What does Fanuc Spindle Alarm code 15 mean? A:  In output switching control or spindle switching control, the switching operation sequence was not executed correctly.  This is issued if one second or more elapses from the transition of a switch request signal (SPSL or RSL) until a power lead state check signal (MCFN, MFNHG, RCH or RCHHG) makes a transition.
  
  
• Q: What does Fanuc Spindle Alarm code 18 mean? A:  A sum check is abnormal.  If this alarm is issued, replace the SPM or SPM control printed-circuit board.
  
  
• Q: What does Fanuc Spindle Alarm code 19 mean? A:  The offset voltage of the phase U (19) or phase V (20) current detection circuit is excessively high. A check is made when the power is turned on.
  
  
• Q: What does Fanuc Spindle Alarm code 20 mean? A:  The offset voltage of the phase U (19) or phase V (20) current detection circuit is excessively high. A check is made when the power is turned on.
  
  
• Q: What does Fanuc Spindle Alarm code 21 mean? A:  The specified polarity of the position sensor is incorrect.
  
  
• What does Fanuc Spindle Alarm code 24 mean? A:  Serial communication data transferred between the CNC and spindle amplifier module contains an error.
  
  
• Q: What does Fanuc Spindle Alarm code 27 mean? A:  The signal of the position code is disconnected.
  
  
• Q: What does Fanuc Spindle Alarm code 29 mean? A:  An excessive load (standard setting: load meter reading of 9 V) has been applied continuously for a certain period (standard setting: 30 seconds).
  
  
• Q: What does Fanuc Spindle Alarm code 31 mean? A:  The motor failed to rotate as specified, and has stopped or is rotating at a very low speed.
  
  
• Q: What does Fanuc Spindle Alarm code 36 mean? A:  The error counter overflowed.
  
  
• Q: What does Fanuc Spindle Alarm code 37 mean? A:  After emergency stop signal input, the motor is accelerated without being decelerated. This alarm is issued also when the motor is not deactivated (the motor is not decelerated completely) when the acceleration/deceleration time (initial parameter setting: 10 seconds) has elapsed after emergency stop signal input.
  
  
• Q: What does Fanuc Spindle Alarm code 41 mean? A:  The position where the one-rotation signal of the position coder is generated is incorrect.
  
  
• Q: What does Fanuc Spindle Alarm code 42 mean? A:  The one-rotation signal of the position coder is not generated.
  
  
• Q: What does Fanuc Spindle Alarm code 46 mean? A:  The one-rotation signal of the position coder cannot be detected normally during thread cutting.
  
  
• Q: What does Fanuc Spindle Alarm code 47 mean? A:  The count value of position coder signal pulses is abnormal. Phases A and B for the position coder have a feedback pulse count of 4096 p/rev per spindle rotation. The SPM checks the pulse counts of phases A and B equivalent to the position coder each time a one-rotation signal is generated. The alarm is issued when a pulse count beyond the specified range is detected.
  
  
• Q: What does Fanuc Spindle Alarm code 50 mean? A:  A value obtained by internal calculation in spindle synchronization exceeded the allowable range.
  
  
• Q: What does Fanuc Spindle Alarm code 52 mean? A:  The synchronization signal (ITP) in communication data transferred to and from the CNC stopped.
  
  
• What does Fanuc Spindle Alarm code 53 mean? A:  The synchronization signal (ITP) in communication data transferred to and from the CNC stopped.
  
  
• Q: What does Fanuc Spindle Alarm code 54 mean? A:  A large current flowing in the motor for a long time was detected.
  
  
• Q: What does Fanuc Spindle Alarm code 55 mean? A:  In spindle switching control or output switching control, a mismatch between the switching request signal (SPSL or RSL) and the power lead state check signal (MCFN, MFNHG, RCH, or RCHHG) continues during motor activation.
  
  
• Q: What does Fanuc Spindle Alarm code 56 mean? A:  The cooling fan for the control circuit section has stopped.
  
  
• Q: What does Fanuc Spindle Alarm code 66 mean? A:  An error occurred during communication (connector JX4) between spindle and amplifier.
  
  
• Q:What does Fanuc Spindle Alarm code 69 mean? A:  This alarm can be issued only when Dual Check Safety is in use. The alarm occurs if, in safety signal mode C, the spindle motor rotation speed exceeds the safety speed.
  
  
• Q: What does Fanuc Spindle Alarm code 70 mean? A:  This alarm can be issued only when Dual Check Safety is in use. The spindle amplifier connection status does not match the hardware setting.
  
  
• Q: What does Fanuc Spindle Alarm code 71 mean? A:  This alarm can be issued only when Dual Check Safety is in use. A safety parameter error occurred.
  
  
• Q:What does Fanuc Spindle Alarm code 72 mean? A:  This alarm can be issued only when Dual Check Safety is in use. The result of the spindle amplifier speed check does not match the result of the CNC check.
  
  
• Q: What does Fanuc Spindle Alarm code 73 mean? A:  The signal of the motor sensor is disconnected.
  
  
• Q: What does Fanuc Spindle Alarm code 74 mean? A:  This alarm can be issued only when Dual Check Safety is in use. The CPU test failed to end normally
  
  
• Q: What does Fanuc Spindle Alarm code 75 mean? A:  This alarm can be issued only when Dual Check Safety is in use. An error occurred in the CRC test.
  
  
• Q: What does Fanuc Spindle Alarm code 76 mean? A:  This alarm can be issued only when Dual Check Safety is in use. The spindle safety function has not been executed.
  
  
• Q: What does Fanuc Spindle Alarm code 77 mean? A:  This alarm can be issued only when Dual Check Safety is in use. The result of the spindle amplifier axis number check does not match the result of the CNC axis number check.
  
  
• Q: What does Fanuc Spindle Alarm code 78 mean? A:  This alarm can be issued only when Dual Check Safety is in use. The result of the spindle amplifier safety parameter check does not match the result of the CNC safety parameter check.
  
  
• Q: What does Fanuc Spindle Alarm code 79 mean? A:  This alarm can be issued only when Dual Check Safety is in use. An abnormal operation was detected in the initial test.
  
  
• Q: What does Fanuc Spindle Alarm code 81 mean? A:  The position where the one-rotation signal of the motor sensor is generated is incorrect.
  
  
• Q: What does Fanuc Spindle Alarm code 82 mean? A:  The one-rotation signal of the motor sensor is not generated.
  
  
• Q: What does Fanuc Spindle Alarm code 83 mean? A:  The SPM checks the pulse counts of phases A and B each time a one-rotation signal is generated. The alarm is issued when a pulse count beyond the specified range is detected.
  
  
• Q: What does Fanuc Spindle Alarm code 84 mean? A:  The spindle sensor signal was disconnected.
  
  
• Q:What does Fanuc Spindle Alarm code 85 mean? A:  The one-rotation signal of the spindle sensor occurred in an incorrect location.
  
  
• Q: What does Fanuc Spindle Alarm code 86 mean? A:  No spindle sensor one-rotation signal occurred.
  
  
• Q: What does Fanuc Spindle Alarm code 87 mean? A:  A spindle sensor signal is abnormal.
  
  
• Q: What does Fanuc Spindle Alarm code 88 mean? A:  The heat sink cooling fan is not running.
  
  
• Q: What does Fanuc Spindle Alarm code A mean? A:  The control program is not running. An error was detected when the control program was running.
  
  
• Q: What does Fanuc Spindle Alarm code A1 mean? A:  The control program is not running. An error was detected when the control program was running.
  
  
• Q: What does Fanuc Spindle Alarm code A2 mean? A:  The control program is not running. An error was detected when the control program was running.
  
  
• What does Fanuc Spindle Alarm code b0 mean? A:  An error occurred in communication between amplifier modules (SPM, SVM and PSM).
  
  
• Q: What does Fanuc Spindle Alarm code C0 mean? A:  An error occurred in serial communication data between the CNC and spindle amplifier module.
  
  
• Q: What does Fanuc Spindle Alarm code C1 mean? A:  An error occurred in serial communication data between the CNC and spindle amplifier module.
  
  
• Q: What does Fanuc Spindle Alarm code C2 mean? A:  An error occurred in serial communication data between the CNC and spindle amplifier module.
  
  
• Q: What does Fanuc Spindle Alarm code C3 mean? A:  In spindle switching a mismatch is found between the switching request signal (SPSL) and the internal status of the motor/spindle sensor signal switching circuit (submodule SW).