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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    Community Moderator Jim Dawson's Avatar
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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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    Community Moderator Jim Dawson's Avatar
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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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    Community Moderator Jim Dawson's Avatar
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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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    Community Moderator Jim Dawson's Avatar
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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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    Community Moderator Jim Dawson's Avatar
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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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    Default Re: 1995 Ez Path wiring in garage with RPC

    Well, the only place the 24VDC goes is to the AUF, so the problem must be with that or something connected to it. Maybe start by disconnecting everything from that board and see if the fuse still blows. One thing you might do is, with the main power off and FU9 removed, connect an ohmmeter across 24 and 39 and watch the reading as you disconnect (or reconnect) stuff from (to) the AUF and find out if any connected device causes the Ohms to rise from (or drop to) near zero. That might point in the direction of a problem.

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: 1995 Ez Path wiring in garage with RPC

    Quote Originally Posted by RyGuy1 View Post
    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.
    I just purchased a 95 model EZ path also. You can setup the transformer in the back to 230 volt 3 phase. I am currently running a 20hp Rotary phase converter. Right now my issue is the computer battery died and I am waiting on one to come in so that i can solder it in.



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    Quote Originally Posted by Jim Dawson View Post
    Well, the only place the 24VDC goes is to the AUF, so the problem must be with that or something connected to it. Maybe start by disconnecting everything from that board and see if the fuse still blows. One thing you might do is, with the main power off and FU9 removed, connect an ohmmeter across 24 and 39 and watch the reading as you disconnect (or reconnect) stuff from (to) the AUF and find out if any connected device causes the Ohms to rise from (or drop to) near zero. That might point in the direction of a problem.
    Checking every plug on the auf board right now.
    Hope I find something??



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    Quote Originally Posted by Jefenhauser View Post
    I just purchased a 95 model EZ path also. You can setup the transformer in the back to 230 volt 3 phase. I am currently running a 20hp Rotary phase converter. Right now my issue is the computer battery died and I am waiting on one to come in so that i can solder it in.
    You wired the input on the control transformer
    For 230 input?
    Isn't your lathe only 460 volt 2 speed weg motor??
    Or was it replaced?
    Have you ran your lathe yet?
    And how does the 20hp rpc handle the lathe in high
    gear during spindle start?



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    Quote Originally Posted by RyGuy1 View Post
    Checking every plug on the auf board right now.
    Hope I find something??
    Jim

    I didn't notice a change in resistance as I unplugged
    and plugged connectors in.
    BUT I did have both fuses in and while I plugged in
    wire 39 & 40 in the fuse 10 blew immediately.
    This is really starting to frustrate me as lathe
    worked perfectly right before I brought it home.
    Maybe the bridge rectifier or capacitor feeding the
    24 volts DC are bad??



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    Default Re: 1995 Ez Path wiring in garage with RPC

    With 39-40 unplugged, do you have around 24VDC across the capacitor?

    It really sounds like a short in the AUF. With the 24V plug removed, I would expect to see some resistance across JP12-1A and JP12-2A, I would not expect it to be zero.

    Jim Dawson
    Sandy, Oregon, USA


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    Quote Originally Posted by Jim Dawson View Post
    With 39-40 unplugged, do you have around 24VDC across the capacitor?

    It really sounds like a short in the AUF. With the 24V plug removed, I would expect to see some resistance across JP12-1A and JP12-2A, I would not expect it to be zero.
    I measure about 50 ohms with the 39/40 plug removed
    from the auf board.



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    Community Moderator Jim Dawson's Avatar
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    Default Re: 1995 Ez Path wiring in garage with RPC

    That's about 1/2 amp so that is not blowing the fuses. Maybe try disconnecting all of the plugs from the AUF and connect the 24V feed. See if that blows fuses.

    Jim Dawson
    Sandy, Oregon, USA


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1995 Ez Path wiring in garage with RPC

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