Fanuc Series 0 Model A/B/C Alarms
Fanuc series 0 alarms or known as the 900 system alarms listing faults and error codes. Followed by 300 alarms (Communication alarms) and 400 series alarms (axis and spindle alarms). These systems are commonly refered to as Fanuc Series 0-T and 0-M.
This page details the alarm code, type (name of the alarm and what is normally posted on the Series 0 display and a description of the alarm/error.
| SERIES 0 SYSTEM ALARMS |
| 910 MAIN RAM PARITY This RAM parity error is related to low-order-by-test. 911 MAIN RAM PARITY This RAM parity error is related to the low-order bytes. 912 SHARED RAM PARITY This RAM parity error is related to the low-order bytes of RAM shared with the digital servo circuit. 913 SHARED RAM PARITY This parity error is related to high-order bytes of RAM shared with the digital servo cicuit. 914 SERVO RAM PARITY This is a local RAM parity error in the digital servo circuit. 915 LADDER EDITING CASSETTE RAM PARITY This RAM parity error is related to low order bytes of the ladder editing cassette. 916 LADDER EDITING CASSETTE RAM PARITY This RAM parity error is related to the high order bytes of the ladder editing cassette. 920 WATCHDOG ALARM This is a watchdog timer aalrm or a servo system alarm for axis 1 to 4. 921 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. 922 7/8 AXIS SERVO SYSYTEM ALARM This is a servo system alarm related to axis 7 or 8. 930 CPU ERROR Replace the master PC board. 940 PC BOARD INSTALLATION ERROR PC board installation is incorrect. Check the specification of the PC board. 941 MEMORY PC BOARD CONNECTION ERROR The memory PC board is not connected securely. 945 SERIAL SPINDLE COMMUNICATION ERROR The hardware configuration is incorrect for the serial spindle, or a communication alarm occured. 946 SECOND SERIAL SPINDLE COMMUNICATION ERROR Communication is impossible with the second serial spindle. 950 FUSE BLOWN ALARM A fuse has blown 960 SUB CPU ERROR This is a sub-CPU error. 998 ROM PARITY This is a ROM parity error. |
| Absolute Pulse Coder (APC) or Serial Pulse Coder (SPC) Alarms |
| 3n0 nth-axis origin return Manual reference position is required for the nth axis. 3n1 APC alarm: nth axis communication nth axis communication error. Failure in data transmission. 3n2 APC alarm: nth axis over time nth axis APC overtime error. 3n3 APC alarm: nth axis framing nth axis APC overtime error. Failure in data transmission. 3n4 APC alarm: nth axis parity nth axis APC Paraity error. Failure in data transmission. 3n5 APC alarm: nth axis pulse error nth axis APC pulse error alarm. 3n6 APC alarm: ntha xis battery voltage 0 nth axis APC battery voltage has decreased to a low level so that data cannot be held. 3n7 APC alarm: nth axis battery low 1 nth axis axis APC battery voltage reached a level where the battery must be renewed 3n8 APC alarm: nth axis battery low 2 nth axis axis APC battery voltage reached a level where the battery must be renewed( including when power is OFF) 3n9 SPC ALARM: n AXIS PULSE CODER The n axis ( axis 1-8) pulse coder has a fault. |
| Series 0 Servo Alarms |
| 400 SERVO ALARM: 1, 2TH AXIS OVERLOAD 1-axis, 2-axis overload signal is on. 401 SERVO ALARM: 1, 2TH AXIS VRDY OFF 1-axis, 2-axis servo amplifier READY signal (DRDY) went off. 402 SERVO ALARM: 3, 4TH AXIS OVERLOAD 3 axis, 4 axis overload signal is on. 403 SERVO ALARM: 3, 4TH AXIS VRDY OFF 3-axis, 4 axis servo amplifier READY signal (DRDY) went off. 404 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. 405 SERVO ALARM: ZERO POINT RETURN FAULT Position control system fault. 406 SERVO ALARM: 7, 8TH AXIS OVERLOAD 7TH, 8TH AXIS VRDY OFF 7-axis, 8-axis overload signal is on. 4n0 SERVO ALARM: n-TH AXIS -EXCESS ERROR The position deviation value when the n-th axis stops is larger than the set value. 4n1 SERVO ALARM: n-AXIS-EXCESS ERROR The position deviation value when the n-th axis stops is larger than the set value. 4n3 SERVO ALARM: n-th AXIS -LSI OVERFLOW The contents of the error register for the n-th axis exceeded power. 4n4 SERVO ALARM: n-TH AXIS DETECTION RELATED ERROR N-th axis digital servo system fault. 4n5 SERVO AALRM: n-TH AXIS- EXCESS SHIFT A speed higher than 4000000 units/s was attempted to be set in the n-th axis. 4n6 SERVO ALARM: n-TH AXIS -DISCONNECTION Position detection system fault in the n-th axis pulse coder ( disconnecton alarm). 4n7 SERVO ALARM: n-TH AXIS-PARAMETER INCORRECT This alarm occurs when the n-th axis is in one of the conditions below: The value set in Parameter no 8n20 (motor form) is out of the specified limit. A proper value ( 111 or -111) is not set in parameter no 8n22.( motor revolution direction). Illegal data ( a value below 0, etc) was set in parameter No 8n23 ( number of speed feedback pulses per motor revolution) 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. An axis selection parameter ( from No.269 to 274 is incorrect. An overflow occured during parameter computation. 490 SERVO ALARM: 5TH AXIS OVERLOAD 5-axis, 6-axis overload signal is on. 491 SERVO ALARM: 5, 6TH AXIS VRDY ON 5-axis, 6-axis servo amplifier READY signal (DRDY) went off. 494 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. 495 SERVO ALARM: 5, 6TH AXIS ZERO POINT RETURN This is a position control circuit error. |
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