#9 spindle fault

[logos]

I purchased a Fadal some time back for home shop. It has been used about a dozen or so times in past few months always ran fine. Today I was running a part and when came to tool change it z up and stopped. No fault showed, but would not change tool. I went to manual and joged to cs. manual input tool change and faulted. I turned off and restarted tool changed manual input. I deleted drill so no programed tool change. No tool in spindle started program tool changed ran profile of part comped off z up stopped again. It turned off spindle but coased to stop faulted again.
What do you think?
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[logos]

?
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[Al_The_Man]

Do you have documentation that explains what Alarm #9 is? Is there any further description?
Is there alarm lights on the spindle drive? Does it only occur after a Z move?
Al.

[nervis1]

First thing I'd do is check the air pressure. Only time I've had a z fault was at tool change because I forgot to turn on the air.

May have a bad solenoid, or a plugged air line as well.

Assume you have the umbrella style changer?

[logos]

I will check what book says about fault #9. I went back out today and ran it again. It will run whole program tool change and all if I keep speed down under 500 rpm and small tool. I put in a face mill and it would fault at m5. It seems to free wheel after m5 and the control must read rpm as being there and no power so it faults. What is it that stops spindle afer m5? I checked air pressure was 85 psi at machine. The fault is at spindle not z axis I did not word that very well. ( I lose my train of thought tring to type).
Thanks
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[Al_The_Man]

It almost sound like it is a problem with the spindle accel/decel rate, if after an M5, the decel causes overvoltage or similar then the spindle shuts off and the then coasts, the same if you program a high rpm and it causes the spindle to shut down on acceleration.
What type of spindle is it, DC, AC or AC induction motor with VFD?
Al.

[nervis1]

Pg 257 of the users manual

"#9 axis fault: spindle fault line down.

The fault line signal down to the inverter should stay high during spindle operation. If the signal is held low when the spindle is running then this error messege is displayed. "





Maybe Al can decipher that for you if need be. I don't even know what a fault line signal is.

Hope it's cheap to fix. Good luck.





P.S. you can download all of the Fadal manuals on line on their site.

[TR MFG]

spindle drive is "week" is it a Baldor drive?

[Al_The_Man]

The manual shows that this is the inverter fault line output. The cheapest test off the bat is, if the motor is a regular induction motor, hook it up direct to the three phase at its rated voltage and check for current on each phase, if that is ok and everything appears free, no binding then suspect the inverter.
It could also be a defective encoder, but there should be an encoder fault flagged if this were the case.
Al.

[Geof]

Originally Posted by Al_The_Man It almost sound like it is a problem with the spindle accel/decel rate, if after an M5, the decel causes overvoltage or similar then the spindle shuts off and the then coasts, the same if you program a high rpm and it causes the spindle to shut down on acceleration. What type of spindle is it, DC, AC or AC induction motor with VFD? Al.

Do those drives have a braking resistor? It sounds a bit like a possible open circuit on this giving an overvoltage condition when decelerating.

[logos]

It has a Mitsubishi, Freqrol-Z300 6500 rpm invreter.
In cabinet where inverter is there is list showing where jumpers go for different voltage. 240 is marked 230 next then 210 listed on down. I ask Fadal man when I picked up machine ( he was installing new replacement for the one I bought) if that should be changed for my 220, he said should be fine at 240. That it would run anywhere 208 to 240.
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[Al_The_Man]

You can down load the complete manual from the Mitsubishi site http://www.meau.com/Files/IB_NA_66274-A.PDF
Does the drive include the parameter unit? This is the program keypad, As you can test the unit by running manual etc, also you should be able to see the fault code either on the P.U. or the inverter display.
The inverter diagnostic display should give you more of an idea what the fault is.
As I mentioned, you can exclude the motor and load as the problem by moving the three phase that goes to the motor over to the inverter input 3 phases, this will run the motor at the base speed as soon as power is applied to the inverter.
You can also take a amp reading of each phase to see if it is unbalanced.
If the motor and load checks out OK, it may point to the inverter as the problem.
Al.