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..