Fanuc AC Axis Alarms
Fanuc AC Axis Alarms. These alarms cover both faults and error codes on all analog (6050) and digital axis drives, VCU (velocity control units) and servo amplifier units (6057, 6058, 6066) pre ALPHA/BETA. The last two series being the S series and C series servo drives.
| LED INDICATION | ALARM TYPE | DESCRIPTION OF ALARM/ERROR |
|---|---|---|
| On 6050 and others | These alarms are common too most series below. | |
| TG (L/M/N) | Tacho Generator Loss | If the feedback cable is disconnected, TG lamp lights. If a motor does not make a speedy start because of extremely large motor torque. |
| HV | High Voltage | If the DC voltage of the main power supply is abnormally high. The motor is stopped by dynamic braking with HV lamp lit. |
| LV | Low Voltage | LV occurs when the DC link voltage is excessively low or the regulator circuit has a malfunction. |
| HC | High Current | HC occurs when excessive current has crossed the DC link. |
| DC | Discharge Circuit | DC occurs when the capacity of the the discharge circuit has been exceeded. |
| OVC | Overcurrent | If current exceeding specified value is continuously applied longer than a certain time The motor is stopped by dynamic barking with OVC lamp lit. |
| On 6057/ 6058 Series | Additional Alarms listed on 6057/6058. Most alarms above are relevant | |
| 5V | Low 5V | 5V indicates the state of power source applied on the board |
| DRDY | Ready State | DRDY indicates the ready state of servo servo amplifier. |
| OH | Overheat | OH occurs when a normally closed thermostat contact which is mounted either in the servo amplifier, on a separate discharge unit, or in a power transformer has opened. |
| FAL | In case of fuse alarm NFB1-3 and trip of F4/F5. | |
| 6066 Series | This series has a 7 segment LED display with 1 alphanumeric character | |
| 1 | HV | Overvoltage. If DC voltage of main circuit power supply is abnormally high, over voltage alarm occurs |
| 2 | LV5V | Control power supply undervoltage. Alarm occurs if control circuit power supply voltage (+5V) is abnormally low (LV5V Level: 4.6 VDC) |
| 3 | LVDC | DC Link undervoltage alarm. |
| 4 | DCSW | Regenerative control circuit abnormality. |
| 5 | DCOH | Excessive regerative discharge alarm. |
| 8 / 9 / b | HCM / HCL | Overcurrent. Abnomally high current flows in main curcuits of L or/and M channels of the single or dual axis amplifier. Multiple causes. |
Please contact us if you are unsure what your Fanuc AC Axis alarms mean or refer too. Of course call or email us if you need testing, repair or need an exchange part. Or please visit our dedicated Fanuc AC Axis drives or Fanuc Servo amplifier unit sections.