So, I buy a 2004 Harrison 1330S lathe with Fanuc 21iT control. Supposedly very low hours from facility that made medical endoscopes.
Get it in, fire it up, boots up fine, handwheels will jog axis but I do get 300 alarm telling me I need to re zero axis. This because control has absolute encoders, with 6V battery pack for each axis....voltage low...no big deal.....done it before.
But somewhere in there, can't remember now if before or after changing out the battery packs, the jog axis stopped working. And hasn't worked since.
I presume the reason the axis stopped working is started getting 301 alarm as well. 301=
Fanuc's Alarm Description: Encoder communication error. Failure in data transmission Possible causes include a faulty encoder, cable, or servo interface module.
Additional Suggestions & Alarm Clarification:
Absolute pulse coder, cable or scale faulty, Check to make sure parameters are set correctly and that someone did not try to turn the scale or encoder off or on while troubleshooting. (APC)
I have played with the 1815 parameter to "turn on" the encoder to no avail, I have inspected the fiber optic cables and they seem fine (red lights are shining brightly thru each cable end to end), have checked all fuses, reseated most boards and all ribbon cables. Confirmed there is 5 volts to encoders at the board. 24 volt power supply is good.
Bad encoder seems highly unlikely since they both "died" at the same time. I can turn an axis screw by hand and nothing changes on the screen....all zeros.
Also interesting, is that with the machine was a repair report from a Fanuc tech who visited the previous owners facility back in June. It's not clear why the tech came for a repair but he noted in the report there were 301 alarms in the history. When he got there apparently the machine was running fine but I found that note worrisome.
Anyhoo...any ideas ? Would it be worth getting new fiber optic cables just in case there is fiber fault not obvious from the red light observations ?
Get it in, fire it up, boots up fine, handwheels will jog axis but I do get 300 alarm telling me I need to re zero axis. This because control has absolute encoders, with 6V battery pack for each axis....voltage low...no big deal.....done it before.
But somewhere in there, can't remember now if before or after changing out the battery packs, the jog axis stopped working. And hasn't worked since.
I presume the reason the axis stopped working is started getting 301 alarm as well. 301=
Fanuc's Alarm Description: Encoder communication error. Failure in data transmission Possible causes include a faulty encoder, cable, or servo interface module.
Additional Suggestions & Alarm Clarification:
Absolute pulse coder, cable or scale faulty, Check to make sure parameters are set correctly and that someone did not try to turn the scale or encoder off or on while troubleshooting. (APC)
I have played with the 1815 parameter to "turn on" the encoder to no avail, I have inspected the fiber optic cables and they seem fine (red lights are shining brightly thru each cable end to end), have checked all fuses, reseated most boards and all ribbon cables. Confirmed there is 5 volts to encoders at the board. 24 volt power supply is good.
Bad encoder seems highly unlikely since they both "died" at the same time. I can turn an axis screw by hand and nothing changes on the screen....all zeros.
Also interesting, is that with the machine was a repair report from a Fanuc tech who visited the previous owners facility back in June. It's not clear why the tech came for a repair but he noted in the report there were 301 alarms in the history. When he got there apparently the machine was running fine but I found that note worrisome.
Anyhoo...any ideas ? Would it be worth getting new fiber optic cables just in case there is fiber fault not obvious from the red light observations ?