401 ALARM is 'normally' caused when the Fanuc CNC isnot getting the 24 V ready signal send via the ESP switch in the PSM
402 SERVO ALARM: SV CARD NOT EXIST (sounds like the servo card is faulty)
Thread: 401 servo alarm (VRDY off)
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07-20-2010, 07:07 AM #1
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07-20-2010, 09:57 AM #2
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401 Alarm
Hi All
This is my first post on this site but have been browsing a lot.
We have 6 fanuc robots(CNC) and resntly had same problem and found power supply -15V rail was not working. It is worth check all the voltages on the power supply card against the 0V line.
Another choice is servo amplifiers have a loop plug in the bottom and small relay contacts inside to tell cpu that amplifiers are okay. We have found this relay to cause errors and bridge out plug.
Good luck with your efforts
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