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.