Newbie 1995 Ez Path wiring in garage with RPC


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Thread: 1995 Ez Path wiring in garage with RPC

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    Default 1995 Ez Path wiring in garage with RPC

    Hello all.
    I recently purchased a used 1995 ez path 1 cnc lathe.
    It WAS running off 600 volts at previous shop and stepping down to 460 volts with transformer.
    I only have 230v single phase.
    Machine does have a step up transformer under tailstock in a cabinet which I wired for 230v in 460 out.
    My question is do I leave the back cabinet smaller transformer at 460 input or change to 230 input?
    Any help would be greatly appreciated.

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    Default Re: 1995 Ez Path wiring in garage with RPC

    If the control transformer is fed from the main transformer, and the main transformer is outputting 460V then you would want to leave it wired for 460V input.

    Jim Dawson
    Sandy, Oregon, USA


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    Quote Originally Posted by Jim Dawson View Post
    If the control transformer is fed from the main transformer, and the main transformer is outputting 460V then you would want to leave it wired for 460V input.
    Ok thanks.
    Another question would be is I have a 10 hp rpc
    and wanted to at least turn on lathe for setup etc..
    Is it possible that my lathe wont even turn on as the recommended is 15 or 20 hp rpc??



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    Default Re: 1995 Ez Path wiring in garage with RPC

    I'm sure the lathe will start, but check the voltage. The RPC might complain a bit on spindle start, but it should run if the phase to phase voltage balance is not too far out. If you have another 3 phase machine that you can turn on prior to starting the lathe, that will add to the RPC capacity.

    Jim Dawson
    Sandy, Oregon, USA


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    Quote Originally Posted by Jim Dawson View Post
    I'm sure the lathe will start, but check the voltage. The RPC might complain a bit on spindle start, but it should run if the phase to phase voltage balance is not too far out. If you have another 3 phase machine that you can turn on prior to starting the lathe, that will add to the RPC capacity.
    Jim

    Thanks yet again
    My voltages are 492/463/458 on the 3 phases coming
    out of the step up transformer.
    Are these close enough?
    Also I keep blowing the 6 amp fuses for thè
    24 volt supply (fuse 9 and 10 on schematic)
    There are no lights on the auf board and my e-stops
    Will not clear - thinking it's related.
    Any ideas?



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    Default Re: 1995 Ez Path wiring in garage with RPC

    Kind of hard to say about the unloaded balance of the RPC. That's pretty far off, but what really counts is what the voltage looks like when the lathe is powered up.

    I don't have the schematic for the machine. Are those the fuses for the input or output side of the 24V PS? If the input side, maybe over voltage? Or the output side a short somewhere. I suspect the E-stop won't clear until you have the 24V PS up and running.

    Jim Dawson
    Sandy, Oregon, USA


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    Quote Originally Posted by Jim Dawson View Post
    Kind of hard to say about the unloaded balance of the RPC. That's pretty far off, but what really counts is what the voltage looks like when the lathe is powered up.

    I don't have the schematic for the machine. Are those the fuses for the input or output side of the 24V PS? If the input side, maybe over voltage? Or the output side a short somewhere. I suspect the E-stop won't clear until you have the 24V PS up and running.
    I measure 24 volts coming out of the transformer
    into that fuse.
    Would a short affect both fuses?



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    Default Re: 1995 Ez Path wiring in garage with RPC

    That does seem a bit odd. Without seeing a schematic or at least a picture of that area of the control cabinet the best I could do is take a wild guess at what's going on. Just not enough information to offer any useful advice.

    Jim Dawson
    Sandy, Oregon, USA


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    Quote Originally Posted by Jim Dawson View Post
    That does seem a bit odd. Without seeing a schematic or at least a picture of that area of the control cabinet the best I could do is take a wild guess at what's going on. Just not enough information to offer any useful advice.
    Jim

    Here is a picture of the wiring schematic.
    Fuses 9 and 10 are the one's blowing.

    Attached Thumbnails Attached Thumbnails 1995 Ez Path wiring in garage with RPC-20180417_161827-jpg  


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    Default Re: 1995 Ez Path wiring in garage with RPC

    OK, that picture is very helpful.

    With FU9 removed, I would expect to see about 24VDC on wires 24 and 39. If FU10 is blowing with FU9 removed, then my best guess is that BR-1 is shorted, or the 1400MF cap is shorted. With FU10 removed, I would also expect to see about 17 VAC across wires 7 and 8.

    The AUF board is powered up by the 24V PS, so until you get the 24V issue worked out, it is going to be dead.

    Jim Dawson
    Sandy, Oregon, USA


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    Quote Originally Posted by Jim Dawson View Post
    OK, that picture is very helpful.

    With FU9 removed, I would expect to see about 24VDC on wires 24 and 39. If FU10 is blowing with FU9 removed, then my best guess is that BR-1 is shorted, or the 1400MF cap is shorted. With FU10 removed, I would also expect to see about 17 VAC across wires 7 and 8.

    The AUF board is powered up by the 24V PS, so until you get the 24V issue worked out, it is going to be dead.
    Ok, thanks Jim.

    I will do some more measuring later tonight and post my findings.

    Thanks again



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    Quote Originally Posted by Jim Dawson View Post
    OK, that picture is very helpful.

    With FU9 removed, I would expect to see about 24VDC on wires 24 and 39. If FU10 is blowing with FU9 removed, then my best guess is that BR-1 is shorted, or the 1400MF cap is shorted. With FU10 removed, I would also expect to see about 17 VAC across wires 7 and 8.

    The AUF board is powered up by the 24V PS, so until you get the 24V issue worked out, it is going to be dead.
    I tested the bridge rectifier and the capacitor
    They tested ok.
    Then I measured the voltages as you described.
    My findings were 26.7 volts DC between 24 and 39.
    Fuse 10 did not blow with fuse 9 removed.
    With fuse 10 removed I read 20.3 VAC.
    When I put fuse 9 in it blew both fuses instantly??
    Not quite sure what to do next??



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1995 Ez Path wiring in garage with RPC

1995 Ez Path wiring in garage with RPC

1995 Ez Path wiring in garage with RPC