Fanuc 401 & 414 Servo Alarms

[crazycnc]

Hello,
I have a Takisawa TC-20 lathe with a Fanuc 21-TB control. For the past week or so in the morning when I started up, I would get a 414 X-Axis and Z-Axis Servo Alarm. I would then shut off the power again and restart. After a few rounds of this the alarm would disappear. However this morning it just won't go away. There was also a 401 X & Z Axis alarm this morning. That has disappeared but the 414 is persistent. Anybody have any troubleshooting tips?

[underthetire]

Sounds like your power supply is not charging. Probably a failing capacitor.
414 Alarm5 bit6 Current conversion error alarm 3.2
414 Alarm1 bit5 Overload alarm (OVC) 3.3.2
414 Alarm1 bit3 1 DC link over-voltage alarm (HV) 3.1.2
414 Alarm1 bit6 2 Low control power voltage alarm (LV) 3.1.2
3 Low DC link voltage (LVDC) 3.1.2
414 Alarm1 bit2 4 Regenerative discharge control circuit failure alarm (DCSW) 3.1.2
5 Over-Regenerative discharge alarm (DCOH) 3.1.2
414 Alarm5 bit5 7 Dynamic brake circuit failure alarm (DBRLY) 3.1.2
414 Alarm1 bit4 8 L axis over- current alarm (HCL) 3.1.2
8. L axis IPM alarm (IPML) 3.1.2
9 M axis over- current alarm (HCM) 3.1.2
9. M axis IPM alarm (IPMM) 3.1.2
b L, M axis over- current alarm (HCLM) 3.1.2
b. L, M axis IPM alarm (IPMLM) 3.1.2

[crazycnc]

Ok, thanks for the reply. You have given lots of information, I just need to know how to decipher it now. Are those bit values that I need to look up in the Diagnostics screen to figure out what the problem actually is? Thanks in advance for your help

[zavateandu]

hi m8

look here maybe will solve u problem
Fanuc 0M with repeated 401 Alarm

GOOD LUCK!

[crazycnc]

I did finally get it running again yesterday, but I'm getting the 414 errors again this morning. When I look at the diagnostics screen #200 and #204 are all zeros (which I understand is the way they should be). But #201, bit #4, EXP is set to 1. I can't quite figure out from the manual what this actually means.