300 APC alarm

[nabil_elbadri]

hi gents, i have an alarm on (vmc) fanuc Oi-mc, alarm number 300 it says x axis need zero,
y axis need zero
i had this alarm after i change the 2 batteries for (APC) after got low voltage ,and now when i switch the machine on i can't call the axis to home position,
and got alarm number 300
my question is how can i call axis to home position and reset the alarm ?
any help will be appriciated
thnx

[sinha_nsit]

THE FOLLOWING IS THE PROCEDURE FOR SETTING REFERENCE POSITION (FOR MACHINES WITH ABSOLUTE ENCODER) IN CASE THE REFERENCE POSITION IS DISTURBED BY ANY REASON :
SET PARAMETER 1815 # 4 (APZ) FOR THE CORRESPONDING AXIS (X OR Z) = 0
SWITCH THE POWER OFF AND THEN ON AFTER A FEW SECONDS.
MESSAGE “---- (X OR Z)-AXIS NEED ZRN” WILL APPEAR ON CRT (NC ALARM).
MOVE THE AXIS TO THE REFERENCE POSITION BY MANUAL JOGGING
(NORMALLY 10 MM AWAY FROM THE EMERGENCY POSITION).
SET PARAMETER 1815 # 4 (APZ) FOR THE CORRESPONDING AXIS (X OR Z) = 1
SWITCH THE POWER OFF AND THEN ON AFTER A FEW SECONDS.
NOW THIS POSITION WILL BECOME THE MACHINE REFERENCE VALUE FOR THIS AXIS. IT WILL, HOWEVER, BE DIFFERENT FROM THE PREVIOUS REFERENCE VALUE. AS A RESULT, ALL THE PREVIOUS TOOL OFFSET SETTINGS WILL BECOME INCORRECT AND WILL HAVE TO BE DONE AGAIN.

[fanucman]

Originally Posted by sinha_nsit THE FOLLOWING IS THE PROCEDURE FOR SETTING REFERENCE POSITION (FOR MACHINES WITH ABSOLUTE ENCODER) IN CASE THE REFERENCE POSITION IS DISTURBED BY ANY REASON : SET PARAMETER 1815 # 4 (APZ) FOR THE CORRESPONDING AXIS (X OR Z) = 0 SWITCH THE POWER OFF AND THEN ON AFTER A FEW SECONDS. MESSAGE “---- (X OR Z)-AXIS NEED ZRN” WILL APPEAR ON CRT (NC ALARM). MOVE THE AXIS TO THE REFERENCE POSITION BY MANUAL JOGGING (NORMALLY 10 MM AWAY FROM THE EMERGENCY POSITION). SET PARAMETER 1815 # 4 (APZ) FOR THE CORRESPONDING AXIS (X OR Z) = 1 SWITCH THE POWER OFF AND THEN ON AFTER A FEW SECONDS. NOW THIS POSITION WILL BECOME THE MACHINE REFERENCE VALUE FOR THIS AXIS. IT WILL, HOWEVER, BE DIFFERENT FROM THE PREVIOUS REFERENCE VALUE. AS A RESULT, ALL THE PREVIOUS TOOL OFFSET SETTINGS WILL BECOME INCORRECT AND WILL HAVE TO BE DONE AGAIN.

yea plus you have to reset the 1850 grid shif to zero so that when you change the bit it will set home there and not shift it over by what 1850 says..


if you get the 300 alarm... next time dont replace batteries with power off.. have the control on and in estop..

do this.. move the motor in at lease 2 full rotations then try doing a reference return (providing the machine has deceleration switches)

if that doesnt work.. call the manufacture because there might be a procedure other then just flipping some bits.. i would do that first before anything..

[nabil_elbadri]

thanks for ur help gentelmen, but i realise another problem when i started to do as u told me , the problem is i can't change from 0 to 1 in write enable parameter line on the screen, when I push 1 and then (input) the 0 still exist and don't change to 1 to enable write parameter, is it possible that it has been protected by password or something????if so how can i write enable parameter to do as u told me???
waiting for reply,
thnx alot
hint : the machine is with (absolute pulse coder)

[MysticMonkey]

You must be in MDI mode

You must have EDIT KEY in OFF position

[fanucman]

there also might be an operators screen soft key.. press offsets setting and arrow over

[nabil_elbadri]

I know that it should be in MDI mood and memory key off , what happened is when I view the page on the screen to enable the parameter ,I can't put 1 in . but the rest of the lines (same page) I can change for example chanel selection, I can input all the options that I have on this page (except) the line parameter enable are there a possibility of a password in this type of control ,or some soft key to protect from changing a parameter ??? if so how can I remove it and start the process to reset the 300 alarm????
thnx for ur reply

[MysticMonkey]

Possibly a Keep relay ?

or as fanucman said check the operator switches

OFF/SETT - > - [OPRT] - <PGDN>

[Zoner]

Shouldn't you also set PWE=1 to change a parameter value?

Me not know much yet, me newbie!!

[nabil_elbadri]

that's what i couldn't change . i want to change PWE from 0 to 1 . but it doesn't change, are there maybe a password in this type of controler to protect the parameter from changing ????????????

[Zoner]

Odd -

You know to press the MDI button, and to turn off the memory protect key (make it horizontal).

And you can change other parameters but not PWE - that's not normal. Ours changes OK, you may have a bad button or switch? If you can change another value like TV or SEQ then PWE should change too.

Have you powered the CNC off and back on at all? If not, try that. Sorry I can't help much else, ours definitely works that way.

[beddiemangabat]

hello guys,about your problem?check the switch of program protect.switch ON before change the PWE.enable change to 1.