1997 Bridgeport Romi CNC flat bed lathe Easy Path S

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martyscncgarage
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Re: 1997 Bridgeport Romi CNC flat bed lathe Easy Path S

Post by martyscncgarage »

You provided a picture of the spindle drive label:
Spindle Drive label.jpg
As for the drive, good you found a blown fuse. Disconnect the motor wires from the drive.
Disconnect the cabinet feed wires from the drive.
Connect 240VAC to L1 and L3 power up the drive and note what the display says.

The spindle motor label should be on the motor body itself. I though I saw something on the bottom of the motor.
Marty
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Chevy427z
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Re: 1997 Bridgeport Romi CNC flat bed lathe Easy Path S

Post by Chevy427z »

martyscncgarage wrote: Sun Jan 09, 2022 10:19 am You provided a picture of the spindle drive label:
Spindle Drive label.jpg

As for the drive, good you found a blown fuse. Disconnect the motor wires from the drive.
Disconnect the cabinet feed wires from the drive.
Connect 240VAC to L1 and L3 power up the drive and note what the display says.

The spindle motor label should be on the motor body itself. I though I saw something on the bottom of the motor.
Marty
Duh! I forgot about that picture!

That's exactly what I did yesterday and still got the PUF error, leading me to check the fuse. Or do you mean recheck it with a good fuse in place?
Attachments
PUF error.jpg
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martyscncgarage
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Re: 1997 Bridgeport Romi CNC flat bed lathe Easy Path S

Post by martyscncgarage »

Chevy427z wrote: Sun Jan 09, 2022 10:44 am
martyscncgarage wrote: Sun Jan 09, 2022 10:19 am You provided a picture of the spindle drive label:
Spindle Drive label.jpg

As for the drive, good you found a blown fuse. Disconnect the motor wires from the drive.
Disconnect the cabinet feed wires from the drive.
Connect 240VAC to L1 and L3 power up the drive and note what the display says.

The spindle motor label should be on the motor body itself. I though I saw something on the bottom of the motor.
Marty
Duh! I forgot about that picture!

That's exactly what I did yesterday and still got the PUF error, leading me to check the fuse. Or do you mean recheck it with a good fuse in place?
YES....
Remove all the LINE (Power in) and LOAD (Power to motor) wires
Replace the fuse with a KNOWN good one
TEST with 240VAC only.

We already knew what the drive said with the bad fuse...replace it and retest and see what the drive says.
Marty
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Chevy427z
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Re: 1997 Bridgeport Romi CNC flat bed lathe Easy Path S

Post by Chevy427z »

Got it! Thank you!

Any recommendations on a source for the fuse? Prices are all over the spectrum. Is cheap necessarily good?

Coming up blank on the Yaskawa page for this model.

https://www.yaskawa.com/model-search-ti ... mr-p5u25p5
Last edited by Chevy427z on Sun Jan 09, 2022 11:56 am, edited 1 time in total.
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martyscncgarage
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Re: 1997 Bridgeport Romi CNC flat bed lathe Easy Path S

Post by martyscncgarage »

Chevy427z wrote: Sun Jan 09, 2022 11:53 am Got it! Thank you!

Any recommendations on a source for the fuse? Prices are all over the spectrum. Is cheap necessarily good?

Also, coming up blank on the Yaskawa page for this manual.

https://www.yaskawa.com/model-search-ti ... mr-p5u25p5
This is the one I found:
TM4506.pdf
(3.99 MiB) Downloaded 9 times
A fuse is a fuse. Source it and buy it. I thought you had found one already....
(The picture of the fuse you posted was missing a mounting screw, had you taken one out already?)
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Re: 1997 Bridgeport Romi CNC flat bed lathe Easy Path S

Post by Chevy427z »

Yes, I had removed one screw. I do have both.

Thank you for the link to the manual.
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Re: 1997 Bridgeport Romi CNC flat bed lathe Easy Path S

Post by martyscncgarage »

Mersen/Ferraz Shawmut A30qs504L Semiconductor Fuse, Fast Acting, 50 A, A30qsL https://www.ebay.com/itm/-/384341871393 ... ia%3Dmedia
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Re: 1997 Bridgeport Romi CNC flat bed lathe Easy Path S

Post by polaraligned »

Fuses don't blow for no reason. Don't just stick a new one in there and try it. Find the problem. It seems unusual that the motor windings would all be shorted, and I don't think they are. It is not unusual for windings on larger motors to be less than 1 ohm. I assume that you zeroed out the lead resistance?
You may have a shorted IGBT in the VFD that took out the fuse. If you have a service company, just send it to them to have it checked out. When you first got this machine and powered it up you said that it homed but had drive problems. Was there an error on the VFD back then?
martyscncgarage
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Re: 1997 Bridgeport Romi CNC flat bed lathe Easy Path S

Post by martyscncgarage »

polaraligned wrote: Sun Jan 09, 2022 12:32 pm Fuses don't blow for no reason. Don't just stick a new one in there and try it. Find the problem. It seems unusual that the motor windings would all be shorted, and I don't think they are. It is not unusual for windings on larger motors to be less than 1 ohm. I assume that you zeroed out the lead resistance?
You may have a shorted IGBT in the VFD that took out the fuse. If you have a service company, just send it to them to have it checked out. When you first got this machine and powered it up you said that it homed but had drive problems. Was there an error on the VFD back then?
I think some of what you are suggesting maybe over his head.
Its why I said to remove the load (motor wires)
I would spend the $60 on a fuse and put 240VAC to the drive to see how it responds.
That is cheap and something he can do. After that, he needs to decide which way he is going to proceed with his build. Decide whether or not he wants to invest in having the VFD repaired or replaced it with a more appropriate VFD.
We have no idea what his electronic skill level is. And we certainly don't want him to be poking around where he is not comfortable.

My .02
Marty
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polaraligned
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Re: 1997 Bridgeport Romi CNC flat bed lathe Easy Path S

Post by polaraligned »

That is why I recommended sending it out for repair. Mark did mention a company TIE that he implies services these. I would send it off. Something caused that fuse to blow. Funny how the blown fuse error message is PUF...like you let out a puff of the magic smoke from the fuse. :lol:

While it is out being checked, I would trace the motor wires carefully to make sure something is not shorting them. The resistance is a bit low, but maybe not too low for this motor provided he zeroed the test lead resistance when measuring.

EDIT: I just checked out the manual and they do have a section on testing for bad IGBT's. Should be easy enough to do.
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