Fanuc BETA servo alarms
Servo Amplifier Unit Alarms
As you can see from the pictures below they have slightly different alarm systems. Check for your Fanuc BETA servo alarms either on the CNC or via the 7 segment display on the BETA unit. If alarm condition related to the servo amplifier unit occurs, the alarm indicator on the amplifier front panel is lit. Check the description of alarm at servo tuning screen. Follow this link for Fanuc BETA units in stock
Below are the FANUC BETA servo alarms that present on BETA PWM & FSSB interface; see BETA I/O alarms in section below.
BETA PWM servo alarm 
BETA I/O servo alarm 
BETA FSSB alarms
Servo Alarm codes presenting on Series 0, 16, 18, 21
| Alarm No | Description |
| 309 Alarm 2 | Pulse Coder error alarm 0 Series |
| 350 Alarm3 | Pulse coder error alarm 16-21 |
| 351 Alarm4 | Pulse coder communication error alarm |
| 400 Alarm1 bit7 | Overheat alarm (motor) |
| 414 Alarm5 bit6 | Current conversion error alarm |
| 414 Alarm1 bit5 | Overload alarm( OVC) |
| 414 Alarm1 bit3 | DC link over voltage alarm (LVDC) |
| 414 Alarm1 bit6 | Low DC link voltage (LVDC) |
| 414 Alarm1 bit2 | Over generative discharge alarm (DCOH) |
| 414 Alarm1 bit4 | Over current alarm (HC) |
| 416 Alarm1 bit1 | Feedback disconnected alarm |
| 417 | Invalid servo parameter setting alarm |
| Type | Description |
| Over voltage alarm (HV) | This alarm occurs if the DC voltage of the main circuit power supply is abnormally high |
| Low DC link voltage alarm (LVDC) | This alarm occurs if the DC voltage of the voltage main circuit power supply is abnormally low or the outer circuit breaker trips |
| Over regenerative discharge alarm ( DCOH) | This alarm occurs if:The average regenerative discharge energy is too high. |
| Overheat Alarm (OH) | This alarm occurs if the temperature of the amplifier is abnormally high |
| Fan Alarm (FAL) | The fan, built into the servo amplifier unit has stopped |
| Over current alarm (HC) | This alarm occurs if an abnormally over current flows in servo amplifier unit |
Fanuc BETA Servo Alarms / codes presenting on Series 16i, 18i, 21i
Additional FSSB associated alarms
| 5135 | FSSB: error mode |
| 5136 | FSSB: number of amp is small |
| 5137 | FSSB: configuration error |
These alarms present on I/O Link BETA amplifiers with the 7 segment display. These are the common alarms; there are many more in the dedicated maintenance manuals.
| LED display | Description |
| 4 | The servo motor has overheated (estimated value) |
| Servo amplifier ready signal (DRDY) went off. | |
| o | The cooling fans have overheated. |
| J | The regeneration discharge has over heated |
| n | Reference position return could not be executed correctly. |
| The servo position error in the stop state is larger than the value specified in parameter no 110. | |
| The servo position error during movement is larger than the value specified in parameter no 182. | |
| c | An overcurrent alarm is issued |
| y | A DC link overvoltage alarm is issued. |
| P | A DC link low voltage alarm is issued. |
| A | A parameter has been specified incorrectly. |
| E | A DO alarm is issued |
| t | The specified speed excess 32767000 detection units per second. |
| C | The cooling fan has stopped. |