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  1. #1
    Activation process thewillow's Avatar
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    Default prt 1500w controller

    Hi Guys,
    I've been doing work on my chinese cnc machine for about 5 months now and have run into a problem. I use a 6040 with a prt 1500w controller and custom made exhaust shoe with mach 3, which up until recently was working fine to mill my windsurfing fins from g11 and carbon.
    I'd been watching the roughing stage, then the final cut, and went inside to grab another coffee. While I was inside, I noticed a change in tempo, then raced back out to see that the spindle had dropped down onto the job, the exhaust (dust shoe) had filled up and was smoking and the dust bag in the vacuum cleaner was quite clearly full.
    I had no idea about identifying problems at that stage, and probably still don't, but thought that the stepper motor had failed. Undid the motor and connected it to the y axis and found that it worked. Then I thought that the stepper motor controller was shot, but couldn't isolate the problem. So, I tried the break out board next and found that the z axis didn't work on the bob but the other two did. I guessed at that stage that the stepper controller and the bob had had it.
    I could not see anything wrong with the pcb inverter or power unit, so I went online and ordered 3 new stepper controllers, a new break out board and a 76mm 3A motor (with 1.8nm instead of 1.2) hoping that Tim the tool man actually made sense. My question would be, could this be a viable option, or am I trying to make a silk purse from a sow's ear? Is there a unit that would be more reliable, knowing of my shortcomings with electronic circuitry?

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    Attached Thumbnails Attached Thumbnails prt 1500w controller-20190208_165158-jpg  


  2. #2
    Member Sterob's Avatar
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    Default Re: prt 1500w controller

    Welcome to the forum.
    If you replacing 'like for like' then it should work just like it used to, not withstanding the reason it failed in the first place. Overheating or overloading? If components ARE getting hot, adding some air flow may be enough to stop it happening again.

    Options depend on your skill set and how deep your pockets are.

    There a few options to fitting better quality components to your controller case, if you can do electrical work and are able to solve problems as they arise.

    If you can and want to afford it, there are complete good quality control boxes available to just swap out with you original control box.
    It hard to advise anything more specific than that at this stage.
    Is there anone nearby who has a CNC Router, that can help you? A Makers Group?

    If you add your location, someone close, may be able to help.

    Maybe post some pics. That may help us to help you.



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    Default Re: prt 1500w controller

    Hi Sterob,
    Thanks for the reply, I'm replacing the stepper motor drivers with different models. And also the break out board, I'll show some photos of the controller as it stands, and a photo to show what I intend to replace them with. The reason for replacing with different items is that they're no longer available. (or reliable for that matter).
    I've shown a photo of my set-up, with custom dust shoe,(now totalled) and radiator with computer fans. I had to replace the spoil board also as it set fire to that too. The lead going overhead is an extractor fan for the g11 dust that escapes the vacuum.

    Attached Thumbnails Attached Thumbnails prt 1500w controller-20190301_144652-jpg   prt 1500w controller-20181215_144812-002-jpg  


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    Default Re: prt 1500w controller

    Sorry, my photos seem to be landscape and not portrait.
    As you can see, I've removed the z axis motor controller from the box to inspect it for hot spots or obvious damage, but nothing overt so far.

    Attached Thumbnails Attached Thumbnails prt 1500w controller-20190315_134754-jpg   prt 1500w controller-20190315_134740-jpg  


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    Default Re: prt 1500w controller

    Re: pic orientation

    I found that if you crop the pics, so that they are wider than tall, they will display correctly.

    My Router is different yours. Is your Spindle DC?
    Do you need to use some other hardware to control that, if you remove your original PCB?



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    Default Re: prt 1500w controller

    I'll give that a try next time.
    I was planning on keeping the original pcb and power supply as they don't seem to be damaged. Yep, my spindle is dc (1.5kw) Can that be done?



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    Default Re: prt 1500w controller

    Quote Originally Posted by thewillow View Post
    I'll give that a try next time.
    I was planning on keeping the original pcb and power supply as they don't seem to be damaged. Yep, my spindle is dc (1.5kw) Can that be done?
    Sorry....don't know. Hopefully someone else will chime to help.



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    Default Re: prt 1500w controller

    I think this might end up being a "hold my beer" effort. I've been looking on line for a similar vfd but I think I'll give this one a crack, I've got a brand new fire extinguisher anyway.



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    Default Re: prt 1500w controller

    Just a quick question for the refurb buffs. I've got 3 leads going from my vfd (board) to the breakout board (tx141275). One is FOR another is COM and the 3rd is AV1. I was planning to connect the for and com to the new bob (mach3) type, but the 3rd has me stumped, it's a black wire (av1), does that make it a ground wire?
    Picture is 144652jpg



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    Default Re: prt 1500w controller

    FOR and COM will be a relay contact from your BOB to start the VFD.
    AV1 will be a Analog Voltage ( usually 0 - 10 VDC ) to control the speed of your VFD.
    I assume that will use COM as well? Better make sure.



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    Question Re: prt 1500w controller

    Thanks very much for that Sterob. Working through the wiring at the moment, keeping hopes high. It may seem a very basic question, but I have a speed controlled vfd on the exterior of the machine, which comes from the vfd board. Will it be necessary to hook up the 0-10v if it's not needed? I'm assuming that the spindle speed control comes from the motherboard (vfd), which is a ribbon cable? The ribbon cable is on the bottom left.
    You can also see the fwd, com and av1 wires on the panel, with a circular magnet.

    Attached Thumbnails Attached Thumbnails prt 1500w controller-20190301_144652-jpg  


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    Default Re: prt 1500w controller

    I'm a little confused by your terminology and that is making it hard for me to help you. I don't want to give you the wrong info.
    You aren't using a VFD as you have a DC Spindle?
    Have you a schematic of the original wiring?

    I was going to PM you but I can't see the link in yout profile.



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