Fanuc Axis Alarms (list by Fanuc axis drive type). The servo drive alarms listed on this page are for non numerical alarm codes for most drives, except C servo units). Instead these are the alarms lite on the LED indicator bars on the drive control PCB. If you are looking for ALPHA servo amplifier alarms (click here…)

Where can I find my axis drive alarms ?

It’s dependent on the type of drive. Different axis drive control boards (top cards) have different layouts. For the 6047 there are 6 led lights.

DC Velocity Control Unit alarms (A06B-6047-Hxxx)

  • HCAL High Current Alarm
  • DCAL DC Alarm (low)
  • TGLS Tacho Generator Loss
  • BRK Break
  • HVAL High Voltage Alarm
  • OVC Over current Alarm

AC Velocity Control Unit alarms (A06B-6050-Hxxx)

  • TG
  • NFB
  • HV
  • LV
  • HC
  • DC
  • OVC

AC Servo Amplifier Unit (A06B-6057-Hxxx & A06B-6058-Hxxx)

  • 5V Low command voltage
  • DRDY
  • HV High Voltage
  • HC High Current
  • LV Low Voltage
  • DC DC Low
  • OH Overheat
  • FAL

AC Servo Amplifier Unit (A06B-6066-Hxxx) displays digit in 7 segment disp

  • 1 = HV (high voltage)
  • 2 = LV5V (low voltage on 5v line)
  • 3 = LVDC (low voltage DC)
  • 4 = DC SW
  • 5 = DCOH (Overheat DC)
  • 6 = OH (Overheat)
  • 7 = MCC (magnetic contactor)
  • 8 = HCL (high current L axis)
  • 9 = HCM (high current M axis)
  • b = HCLM (high current L & M axis)