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Fanuc Alarm Codes
Fanuc Alarm Codes
Wondering what that 8.(dot)alarm is on your Fanuc Servo Drive, This blog will help with your troubleshooting on your Fanuc Servo, Spindle and Power supplies, Alpha drive and older systems
Below is a Fanuc alarm code list of Fanuc parts, We can repair most alarms or offer a service exchange part to get your machine back up and running as quickly as possible, If you need any help please call 07568431113
Select your Fanuc Part to quickly jump to that section
Fanuc Alpha Servo DrivesFanuc Alpha Spinde Drives
Fanuc Alpha Power Supply
Fanuc Servo Drives, 6050, 6057, 6058
Fanuc C Series Drives, 6066, 6089, 6090
Fanuc Alpha Servo Drives Alarm Codes A06B-6079-H, A06B-6096-H, etc
| Alarm Code | Fault | Remedy |
|---|---|---|
| – | Not Ready | Drive is Good |
| 0 | Control Ready | Drive is Good |
| 1 | Internal Fan Stopped | Replace/Repair Servo Drive |
| 2 | Low control power voltage alarm (LV) | Replace/Repair Servo Drive |
| 3 | Low DC link voltage alarm (LVDC) | Check Alpha Power Supply for Alarm |
| 4 | Regenerative dis-charge control circuit failure alarm (DCSW) | Replace/Repair Servo Drive |
| 5 | Over-regenerative discharge alarm (DCOH) | Replace/Repair Servo Drive |
| 6 | L-and M-axis over-current alarm (HCLM) | Servo Drive or Motor Fault |
| 6. Dot | L-and M-axis IPM alarm (IPMLM) | Replace/Repair Servo Drive |
| 7 | Dynamic brake circuit failure alarm (DBRLY) | Replace/Repair Servo Drive |
| 8 | L-axis over-current alarm (HCL) | Servo Drive or Motor Fault |
| 8. Dot | L-axis IPM alarm (IPML) | Replace/Repair Servo Drive |
| 9 | M-axis over-current alarm (HCM) | Servo Drive or Motor Fault |
| 9. Dot | M-axis IPM alarm (IPMM) | Replace/Repair Servo Drive |
| A | N-axis over-current alarm (HCN) | Servo Drive or Motor Fault |
| A. Dot | N-axis IPM alarm (IPMN) | Replace/Repair Servo Drive |
Fanuc Alpha Spindle Drives Alarm Codes A6B-6082-H, A06B-6088-H, etc
| Alarm Code | Fault |
|---|---|
| -- | Not Ready |
| 00 | Control Ready |
| 01 | Motor Overheat |
| 02 | Excess Speed Deviation |
| 03 | Fuse on DC Link Blown |
| 04 | Input Fuse Blown |
| 05 | Control Power Supply Fuse Blown |
| 06 | Overspeed (Analog) (Temperature Sensor Disconnected) |
| 07 | Overspeed (Digital) |
| 08 | High 24v Input Voltage |
| 09 | Overheat Power Semiconductors |
| 10 | Low 15v Input Voltage |
| 11 | DC Link High Voltage |
| 12 | DC Link Overcurrent |
| 13 | Data Memory Fault CPU |
| 14 | Defective ROM |
| 15 | Defective Optional Circuit |
| 16 | NVRAM Fault |
| 17 | NVRAM Checksum Fault |
| 18 | ROM Checksum Fault |
| 19 | IU Offset Current Alarm |
| 20 | IV Offset Current Alarm |
| 21 | VCMD Offset Alarm (Position Sensor Polarity Setting Incorrect) |
| 22 | TSA Offset Alarm |
| 23 | ER Offset Alarm |
| 24 | Serial Transfer Data Error |
| 25 | Serial Transfer Stop |
| 26 | C Velocity Detector Disconnected |
| 27 | Position Coder Disconnected |
| 28 | C Position Detector Disconnected |
| 29 | Short Period Overload |
| 30 | Overcurrent Power Circuit |
| 31 | Motor Lock or V Signal Lost |
| 32 | Serial communication LSI RAM Error |
| 33 | DC Link Pre Charge Failure |
| 34 | Parameter Setting Error |
| 35 | Gear Ratio Parameter Error |
| 36 | Error Counter Overflow |
| 37 | Speed Detector Parameter Error |
| 39 | One Rotation Cs Signal Error |
| 40 | Cs One Rotation Signal Detection Error |
| 41 | Position Coder One Rotation Signal Detection Error |
| 42 | One Rotation Position Coder Detected Error |
| 43 | Disconnected PC for DIF. SP. MOD. |
| 44 | Control Circuit AD Error |
| 46 | Thread Cutting One Rotation Position Coder Alarm |
| 47 | Position Coder Signal Abnormal |
| 49 | High Conversion DIF. SPEED |
| 50 | Excessive speed command calculation value during spindle synchronization |
| 51 | Low Volt DC Link |
| 52 | ITP Signal Abnormal 1 |
| 53 | ITP Signal Abnormal 2 |
| 54 | Current Overload Alarm |
| 55 | Abnormal Switching Status of Power Leads |
| 56 | Inner Fanuc Cooling Fan Stopped |
| 57 | Excessive Deceleration Power |
| 58 | Overload in Fanuc Power Supply Module |
| 59 | Cooling Fan Stopped in PSM |
| 66 | Communication alarm between spindle and amplifier |
| 69 | Safety speed exceeded |
| 70 | Abnormal axis data |
| 71 | Abnormal safety parameter |
| 72 | Motor speed mismatch |
| 73 | Motor sensor disconnected |
| 74 | CPU test alarm |
| 75 | CRC test alarm |
| 76 | Safety function not executed |
| 77 | Axis number mismatch |
| 78 | Safety parameter mismatch |
| 79 | Abnormal initial test operation |
| 81 | Motor sensor one-rotation signal detection error |
| 82 | Motor sensor one-rotation signal not detected |
| 83 | Motor sensor signal error |
| 84 | Spindle sensor disconnected |
| 85 | Spindle sensor one-rotation signal detection error |
| 86 | Spindle sensor one-rotation signal not detected |
| 87 | Spindle sensor signal error |
| 88 | Cooling fan stopped of the radiator |
| A0 | Program ROM error |
| A1 | Program ROM error |
| A2 | Program ROM error |
| b0 | Communication error between amplifier and module |
| b1 | 6 Converter control power supply low voltage |
| b2 | 8 Converter excessive regenerative power |
| b3 | A Converter cooling fan stopped of the radiator |
| C0 | Communication data alarm |
| C1 | Communication data alarm |
| C2 | Communication data alarm |
| C3 | Spindle switching circuit error |
Fanuc Alpha Power Supplies Alarm Codes A06B-6087-H, A06B-6077-H, etc
| Alarm Code | Fault |
|---|---|
| 01 | Overcurrent in the Main Power Module |
| 02 | Cooling Fan Stopped |
| 03 | The temperature of the main circuit heat sink has risen abnormally |
| 04 | The DC Voltage has dropped |
| 05 | The main Capacitor was not recharged within the specified time |
| 06 | The Input Power Supply is Abnormal |
| 07 | In the main circuit the DC Voltage is abnormally high |
Fanuc Alarm Codes for the Fanuc AC Servo Dives, A0BB-6050-H, A06B-6057-H, A06B-6058-H etc
| Alarm Code | Fault |
|---|---|
| HV | High Voltage Alarm |
| HC | High Current Alarm |
| LV | Low Voltage Alarm |
| OVC | Overcurrent Alarm |
| TG | Tacho Generator Loss |
| DC | Discharge Alarm |
Fanuc Alarm Codes for the Fanuc C Series Servo Dives, A0BB-6066-H, A06B-6089-H, A06B-6089-H etc
| Alarm Code | Fault |
|---|---|
| 1 | (HV) DC link over voltage alarm |
| 2 | (LV) Low control power voltage alarm |
| 3 | (LVDC) Low DC link voltage |
| 4 | (DCSW) Regenerative discharge control circuit failure alarm |
| 5 | (DCOH) Over-Regenerative discharge alarm |
| 7 | DBRLY) Dynamic brake circuit failure alarm |
| 8 | (HCL) L axis over- current alarm |
| 8 DOT | (IPML) L axis IPM alarm |
| 9 | (HCM) M axis over- current alarm |
| 9 DOT | (IPMM) M axis IPM alarm |
| b | (HCLM) L, M axis over-current alarm |
| b DOT | (IPMLM) L, M axis IPM alarm |
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