Need Help!- fanuc 0M-D spindle alarm

[samu]

Machine: hardinge VMC1000
Control: Fanuc 0M-D
Alarm: 409(SP=47)Detects incorrect position coder signal count operation.

This alarm only occurs when the spindle starts or stops but not all the time. Could it be due to belt slipping?? Belt makes a loud noise at start and stop so i check tension but it seems to be ok and belt are almost new.

to reset alarm, is there a simpliest way than turn off power and turn on again?

[avtechmachine]

409 Alarm and AL-47 on spindle amplifier, it's mean the spindle encoder is defective, you can turn off spindle encoder by parameter but you can't call M19 or M06 for tool change, only to test run spindle without encoder.

to turn off spindle encoder
Parameter 6505 bit 0 = 0
6501 bit 2 = 0

if you need to order a spindle encoder please let me know

Ahn Vuong
ahnv@avtechmachine.com

[fanucman]

Originally Posted by avtechmachine 409 Alarm and AL-47 on spindle amplifier, it's mean the spindle encoder is defective, you can turn off spindle encoder by parameter but you can't call M19 or M06 for tool change, only to test run spindle without encoder. to turn off spindle encoder Parameter 6505 bit 0 = 0 6501 bit 2 = 0 if you need to order a spindle encoder please let me know Ahn Vuong ahnv@avtechmachine.com

not necessarily... look at the spindle drive... are you using both jy2 and jy4 connections?

Jy4 is for position coder feedback
Jy2 is motor sensor feedback..(could serve both feedback and speed if jy4 isnt being used)

if you are using both you need to check for belt slippage on the spindle itself.. then you need to figure out what kind of position coder you are using via the electrical diagram... then check the cable and senor itself for damage...

if you are using jy2 ONLY then the sensor in the spindle motor OR cable might be having the problem..

[avtechmachine]

If your machine look exacly like attach file then you should try my procedure, I used to work for this machine builder for over 20 years and I think I know what am I talking about!!!!! some time I don't.
If your machine doesn't look like attach file then you should follow fanuman procedure.

Ahn Vuong

[samu]

if encoder is defect, why doest it only happen when spindle start or stop?
could the noise of the belt disturb encoder signal if cable isn't shielded?
encoder is not on motor but is belt driven by the spindle itself. I try to reduce and increase spindle belt tension but there is always a loud noise( WUUU-WUUU-WUUU) when spindle start and stop. Also,i'm not sure but it seems that if the noise increase, alarm occurs more often.

[avtechmachine]

Is your machine look like the attach file??
Ahn Vuong

[samu]

Originally Posted by avtechmachine If your machine look exacly like attach file then you should try my procedure, I used to work for this machine builder for over 20 years and I think I know what am I talking about!!!!! some time I don't. If your machine doesn't look like attach file then you should follow fanuman procedure. Ahn Vuong

yes it's exactly like this!! But alarm happen about 1 on 40 start or stop, then i clear it and i'm able to do 10 or more part before it comes again. Is it possible to desactive position coder in part program with G10 and reactivate it with G10 again before tool change?

[avtechmachine]

unfortunately you can't do that, because your spindle RPM will not be correct.
I seen it before when the encoder getting close to fail it will do that but it will get worse and worse.

I think you should take care the belt noise first by replace the new set of belt or clean it with soap and water, but it is pain to remove and install the old set of spindle belt and end up need to replace the new one
You should also remove the timing belt and inspect the ball bearing below the encoder, inside the housing.

Ahn Vuong

[samu]

Originally Posted by fanucman not necessarily... look at the spindle drive... are you using both jy2 and jy4 connections? Jy4 is for position coder feedback Jy2 is motor sensor feedback..(could serve both feedback and speed if jy4 isnt being used) if you are using both you need to check for belt slippage on the spindle itself.. then you need to figure out what kind of position coder you are using via the electrical diagram... then check the cable and senor itself for damage... if you are using jy2 ONLY then the sensor in the spindle motor OR cable might be having the problem..

there is no jy2 on spindle drive.Here is all conections availble:JX1A JX1B
JY1 JY7B JY4 and all are used.

[samu]

spindle belt is certainly a part of the probleme. I wrote a macro to do soft start and stop,(i tried to set param#6530 soft start/stop time with no effect) and since there is no more alarm!!

[samu]

Originally Posted by avtechmachine You should also remove the timing belt and inspect the ball bearing below the encoder, inside the housing. Ahn Vuong

You know wath you are talkink about. The bearing at the botom of encoder assembly is broken and it was also the source of the noise. I spend so much time suspecting spindle belt and looking for a trouble with it.

thanks a lot

[lmostafa]

need help moriseiki 10T
i hav a machine lathe moriseiki 10T alarme OT 102 excess vilocity error
led 2 on spindle pcb A20B-0009-0533