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- Hurco KM3 3 phase to single phase conversion
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Hurco KM3 3 phase to single phase conversion
Hi, I have Hurco KM3 and I wish to convert it to single phase.
At the moment I have chosen the VFD route, utilise the servo side of the machine to single phase and use the VFD to run the 3 Horsepower spindle.
Has anyone gone down this route, and any advise on this or different options
thanks for any help on this subject
macdave
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Re: Hurco KM3 3 phase to single phase conversion
Hi,
I rather suspect that there is an interlock that prevents the control from operating until the three phase components are properly powered.
It could be something like a phase rotation/phase missing relay. The affirmative output of that relay is required before the control will complete its boot up.
Craig
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Re: Hurco KM3 3 phase to single phase conversion
Hi Craig,
thank you for that, ill see if I can find a drawing showing relay connections from the spindle. I had disconnected the spindle and the coolant pump, both 3 phase, from the relays to try and bypass that. From your thoughts I made need to put a feed to a relay that would normally come from the circuit of the spindle. I presume you looked at the wiring schematic above and couldn't see any thing that might do that.
Dave
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Re: Hurco KM3 3 phase to single phase conversion
Just following up on the post about looking for a relay receiving a signal via the spindle, I have looked at the diagrams and have failed to see anything which might point to a connecting relay. I was given a lead, that it could be a problem on the Personality Board itself, as you can see there are 16 of a particular type of chip, H11G2, these are Photodarlington Opto Couplers (High Gain Switch's). As you can see, it appears 2 have been changed in the past. The board shown below is my old board, I have highlighted the couplers.
![](https://www.cnczone.com/forums/attachment.php?attachmentid=506530&stc=1)
Rather than look for replacement parts I decide to get a backup board, So, I managed to obtain another board, shown below, it is slightly different but apparently should do the same job. The only issue is i need a Hurco Service Document which shows me the settings for the DIP switches and the Jumpers.
Alternatively, if anyone has one of these boards fitted to their KM3/P, could you take a look and take a picture of the DIP SWITCHES and JUMPER settings so I could copy them, thank you for your help on this issue.
![Hurco KM3 3 phase to single phase conversion-km3-electrical-130-jpg](https://www.cnczone.com/forums/attachment.php?attachmentid=506532&stc=1)
Last edited by dave73; 06-16-2024 at 06:58 PM.
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