[premier_industr]

Our Mori MV 45 has been shutting off unexpectadly.
Any ideas ?
It is like someone pushes the off button on the operator panel.
This will happen if the machine is sitting idle or in a program.
Most of the time the machine will power back up by pushing the on button.
Sometimes the machine will stay on for 10+ hours at a time, other times it will shut off after 15 min. of on time.
The machine is a MV45 with a Yasnac MX1 control.
Mori says that the problem is on the Yasnac side, or a 24 volt short somewhere in the wiring.
Yasnac says that it is probably the 24 volt power supply.
My question is this, if it is the power supply, wouldn't just fail completly ? ( and not power back up ? )
Also what other possible problems could be causing this ?
I would like to look at all options before replacing a $1800 power supply.
Thanks
Tom

[TU ANH DUNG]

I think your power supply is failure. I've also got a MV 40-45 system 6M and when the power supply failure the led in board is red.

[premier_industr]

If it is the power supply.

Would it fail intermitidly ?

Or fail all together ? ( completly dead )

[Al_The_Man]

Our Mori MV 45 has been shutting off unexpectadly.

This is Fanuc Forum (wrong) also quadruple posts

[premier_industr]

Al,
Please forward me to the Yaskawa / Yasnac forum.

[Eurisko]

We had an identical problem with a Mori MV40.

Our problem was caused by overheating inside the control cabinet. Clean all of the exhaust and intake fans, replace the air filters, and clean the heat exchanger.

For a quick fix, you can try running with the door open. ( NOT RECOMMENDED )

Still not sure if there is a thermal shutdown circuit or a heat sensitive component, but I'll wager that heat is the problem.

[premier_industr]

What would you consider too hot ?

Our shop is at about 80 deg. and the machine will sometimes shut down from a cold start. ( right away in the morning )

I had also thought that it was the heat at one point.

But now I'm leaning towards a bad contact or a bad power supply.

90% of all people asked says its power supply right off the bat.

The other 10% say dead short or bad contacter.

But I say, if it is a dead short in the 24 volt system why does it shut down even if the machine is not moving ?

And why is it so intermitent ?

Thanks to all that are helping.

[TU ANH DUNG]

If your machine stop suddenly while not working, I think 2 reasons: high temp(install more fans) or your power supply have problems (capa in board is leak so not enough power to supply to PCB and relay module. You can see the illumination of led +5V or 24V or measure and check voltage with VOM.
If your machine stop while working, perhaps short circuit with external device: relay, solenoil,...etc. when the fault happen with M code in program or the moving of axis make the wire touch mass. Some wires sratched due to moving or oil make it hard...