Fanuc A06B-6059-H003 Spindle Servo Type S3 AL-19 Alarm

[CNCinCal]

Booted up my Kitamura MC1 with 0MB control and it homed perfectly, but would not respond to any commands. Checked out control cabinet and found spindle servo had this alarm. I did quite a bit of searching and couldn't find another thread with the same alarm. According to the maintenance manual, AL-16 to AL-23 = Defective arithmetic circuit and peripheral circuit. The control had a low battery alarm, but did not lose the parameters. I have since replaced the batteries under power.

If I remove the board, will I lose the spindle parameters in the unit?

Part of the trouble shooting in the manual requires I check voltages on the board. Those test pins are obstructed by the orientation board. Can I remove the orientation board and power up the control without harming the unit?

If I need to replace the unit, how hard is it to access the parameters and record them, without screwing them up? Are they protected?

Any tips as to how I should proceed?

Thank you in advance.

Roger

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[Mike283]

Fanuc manual says AL-19:
Meaning: Excessive U phase current detection circuit offset.
Description: Detects excessive U phase current detection circuit offset. This check is made only when power is turned on.
Remedy: Correct cause then reset alarm.
Could be: Bad A/D converter, U phase current detector circuit defective or loose contact of connectors between PCB and power circuit.

Mike says: Power down machine, wait 30 minutes, remove U,V&W wires from bottom of spindle drive. Be sure removed wires aren't touching anything and power up machine. If alarm stays there's a problem with the spindle drive unit. If the alarm goes away there's a problem with the wiring to the spindle motor or the spindle motor itself.

Booted up my Kitamura MC1 with 0MB control and it homed perfectly, but would not respond to any commands. Checked out control cabinet and found spindle servo had this alarm. I did quite a bit of searching and couldn't find another thread with the same alarm. According to the maintenance manual, AL-16 to AL-23 = Defective arithmetic circuit and peripheral circuit. The control had a low battery alarm, but did not lose the parameters. I have since replaced the batteries under power.

If I remove the board, will I lose the spindle parameters in the unit?

Part of the trouble shooting in the manual requires I check voltages on the board. Those test pins are obstructed by the orientation board. Can I remove the orientation board and power up the control without harming the unit?

If I need to replace the unit, how hard is it to access the parameters and record them, without screwing them up? Are they protected?

Any tips as to how I should proceed?

Thank you in advance.

Roger

[CNCinCal]

Fanuc manual says AL-19:
Meaning: Excessive U phase current detection circuit offset.
Description: Detects excessive U phase current detection circuit offset. This check is made only when power is turned on.
Remedy: Correct cause then reset alarm.
Could be: Bad A/D converter, U phase current detector circuit defective or loose contact of connectors between PCB and power circuit.

Mike says: Power down machine, wait 30 minutes, remove U,V&W wires from bottom of spindle drive. Be sure removed wires aren't touching anything and power up machine. If alarm stays there's a problem with the spindle drive unit. If the alarm goes away there's a problem with the wiring to the spindle motor or the spindle motor itself.

Thanks for replying Mike, I'll give it a try.

[CNCinCal]

Fanuc manual says AL-19:
Meaning: Excessive U phase current detection circuit offset.
Description: Detects excessive U phase current detection circuit offset. This check is made only when power is turned on.
Remedy: Correct cause then reset alarm.
Could be: Bad A/D converter, U phase current detector circuit defective or loose contact of connectors between PCB and power circuit.

Mike says: Power down machine, wait 30 minutes, remove U,V&W wires from bottom of spindle drive. Be sure removed wires aren't touching anything and power up machine. If alarm stays there's a problem with the spindle drive unit. If the alarm goes away there's a problem with the wiring to the spindle motor or the spindle motor itself.

Update:

OK. I removed U,V,&W wires and powered on the machine. Still shows AL-19. Do I need to reset the alarm in order to clear it?

[CNCinCal]

Update:

Checked DC voltage on test points on orientation board. The test points are not accessible on main board unless I remove orientation board. I'm assuming the orientation board gets its DC voltage from the main board.

The following voltages are tested from the orientation board.

Nominal Measured
+5V 5.1V
+15V 3.16V
-15V -15.0V

Could be the problem here. Not sure if I need to disconnect cables or put the board into test mode as opposed to drive mode???

Hope someone can help me.

Thanks,

Roger

[chich2]

Hi Roger,
Did you resolve this problem? I have the same alarm on my spindle drive also but my machine is O-TC and does not have the orentation board. Can someone also comment if the problem is on the top boards or is it in the back board underneath where the screw terminals are?

Regards,
Chich

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[tfuqua63]

I have an alarm 17 on my Kit MC1 and have a tech coming out tomorrow to help get it running I will let you know if we get it going how we correct the Spindle Alarm.
It was my understanding that something somewhere else would cause this Alarm and it was not the Spindle Drive that has the issue ?
Will let you know

[brq5008]

Roger,
Does the alarm come up with power up?
Also their should be a E-Prom chip with your parameters on the PCB board. You can remove the reversal card and you will not loose them but you will need this card for your machine to work correctly.
Did you MEG the motor it is driving.?

[tomx]

tfuqua63
Can you solve a problem with the alarm 17 ?

Regards
Robert

[zavateandu]

use this document and follow exact the way described in the file
good luck




Ref: AC DIGITAL SPINDLE: - PARAMETER ALL CLEAR AND STANDARD FANUC SETTING
(How to clean alarM 17)

How to initialize the memory (NV-RAM) on the AC Digital Spindle PCB.
ALARM #17

1) Obtain a current spindle parameter list from the Machine Tool Builder.
(This parameter list was supplied by the MTB and should be with the machine.)

2) Turn main power off.

3) On the spindle board change the jumper setting "S1" from DRIVE to TEST.

4) On newer spindle PCB, "SH" jumper must be set from DRIVE to SET.
(Most spindle boards do not have this jumper setting.)

5) Turn the main power on.
You will see the 7 segment display changing as follows.
(00000) to (11111) to...to (FFFFF) to (00000) etc.

6) Push and hold down all 4 buttons (MODE, DATA SET, UP & DOWN)
at the same time until you see (FFFFF) on the display.

7) Push and hold down the (MODE) button, while pushing the (UP) or (DOWN)
button until (FC-22) is displayed.

8) Push and hold the (DATA SET) button until you see (GOOD) on the display.

9) Turn the main power off.

10) Change the "S1" jumper setting from TEST to DRIVE.

11) Change the "SN" jumper setting from SET to DRIVE. (If board has jumper)

At this point, the generic spindle parameters are set. Your machine will not operate properly with these parameters.
The next step is to load the customized parameters back into your machine. The MTB parameter list is needed at this time.

HOW TO CHANGE PARAMETERS

1) With the main power off, set the "SH" jumper from DRIVE to SET
(Most spindle boards do not have this jumper setting.)

2) Turn the main power on.

3) Push and hold all 4 buttons (MODE, DATA SET, UP & DOWN)
at the same time until you see (FFFFF) on the display.

4) Push the (MODE) button, you will see parameter number (F-00) Release the(MODE) button to see the parameter contents.

5) To change the parameter number, push and hold down the (MODE) button, and push the (UP) or (DOWN) buttons to scroll to the next parameter.

6) To change contents of parameter, release the (MODE) button and push the (UP) or (DOWN) button. Change the value to the values on the parameter sheet.

7) After all parameters have been changed, push and hold the (DATA SET) button untill you see (88888) on the display

8) Turn the main power off.

9) Change the "SH" jumper setting from SET to DRIVE. (if jumper is used)

The spindle board has been initalized and the parameters reset. At this time your spindle should run.

This procedure is necessary when the NVRAM has been replaced or when alarm 17 or 23 has occurred. Anytime you have an alarm which will not go away, you can try this. Alarm AL-23 must be cleared this way, it will not go away by cycling power.

[tomx]

Thank you Zavateandu

Regards
Robert

[chich2]

CNCinCal. Did you get yor alarm 19 sorted out?
Chich

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