Need Help! Replace Internal PRT-E1500W With External - Can It Be Done?


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Thread: Replace Internal PRT-E1500W With External - Can It Be Done?

  1. #1
    Member TaffyCarl's Avatar
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    Default Replace Internal PRT-E1500W With External - Can It Be Done?

    Hi,

    Last thought before I buy a new machine. Seeing as I can't gain access to the VFD's settings I'm going to call it "stuffed" - a replacement is $150 AUD plus postage from China. After watching numerous youtube videos on wiring VFD's up I had a thought that I may be able to use an external VFD and the PRT-E1500W box just as a controller for the X, Y and Z using Mach3 of course.

    1) Is this at all possible?
    2) Have I missed anything?
    3) Am I wasting my time?

    In the photo of the internals of my box I've circled the wires that would need to be attached to the external VFD. the other photo is the VFD I'm looking at.

    Cheers

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    Member john-100's Avatar
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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    if the breakout board is like this TX14175

    Replace Internal PRT-E1500W With External - Can It Be Done?-tx14175-circuit-jpg

    I don't see why not

    the BOB will have a 0-10V analogue output to connect to the new VFD to control the spindle speed
    and a relay to switch the spindle on and off

    John



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    Member Sterob's Avatar
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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    Probably just as easy to remove the old VFD from the enclosure and fit the new VFD in its place.
    Would be alot neater.



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    Member john-100's Avatar
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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    While fitting the VFD inside the control box is neater
    having the VFD external can reduce the electrical noise from the VFD and its wiring
    from interfering with the low level logic signals from the BOB


    many of the Chinese CNC control boxes have a shock hazard due to the use of a 5 pin plug as the outlet to the spindle motor

    Replace Internal PRT-E1500W With External - Can It Be Done?-cnc-control-box-shock-hazard-jpg

    I would either fit a socket on the box or use a strain relief and connect the motors cable directly to the VFD terminals


    also double check the earth wire is connected to the spindle motors case
    very often the 4 pin plug on the motor does not have the 4th pin connected !

    Replace Internal PRT-E1500W With External - Can It Be Done?-fitting-earth-wire-inside-spindle-motor-jpg

    John



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    Member TaffyCarl's Avatar
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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    Quote Originally Posted by john-100 View Post
    While fitting the VFD inside the control box is neater
    having the VFD external can reduce the electrical noise from the VFD and its wiring
    from interfering with the low level logic signals from the BOB


    many of the Chinese CNC control boxes have a shock hazard due to the use of a 5 pin plug as the outlet to the spindle motor

    Replace Internal PRT-E1500W With External - Can It Be Done?-cnc-control-box-shock-hazard-jpg

    I would either fit a socket on the box or use a strain relief and connect the motors cable directly to the VFD terminals


    also double check the earth wire is connected to the spindle motors case
    very often the 4 pin plug on the motor does not have the 4th pin connected !

    Replace Internal PRT-E1500W With External - Can It Be Done?-fitting-earth-wire-inside-spindle-motor-jpg

    John
    John,

    On the spindle connection inside the box, even though there are 5 pins only three are used. as for the BOB you show, it is like that.
    You've lost me when you mention 'strain relief' (total noob to all this)

    Cheers.



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    Member Sterob's Avatar
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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    Quote Originally Posted by john-100 View Post
    While fitting the VFD inside the control box is neater
    having the VFD external can reduce the electrical noise from the VFD and its wiring
    from interfering with the low level logic signals from the BOBJohn
    Agreed. Its a bit catch 22. Electrical noise varies with each VFD. Some are better than others. It certainly may be easier to combat it with the VFD on the outside of the enclosure.
    I was thinking more about safety and neatness of the installation.

    Quote Originally Posted by john-100 View Post
    also double check the earth wire is connected to the spindle motors case
    very often the 4 pin plug on the motor does not have the 4th pin connected ! John
    John[/QUOTE]

    Yes, he will find the earth connection missing, probably....
    Very important if something goes wrong....

    Steve

    Last edited by Sterob; 03-26-2019 at 08:37 AM. Reason: spelling


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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    I also agree, if he can he should place his drive in a separate enclosure. However having these drives mounted in the open is a bad idea, i have seen people doing it



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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    Hi TaffyCarl

    If you did away with the chassis mounted plug and inline socket on the motor cable

    you could use a cable strain relief / gland like this -

    Replace Internal PRT-E1500W With External - Can It Be Done?-pg-m-type-nylon-cable-glands-strain

    it protects , seals and clamps the cable as it passes through the cnc control enclosure
    the spiral on the end restricts how much the cable bends as it exits the gland

    from another post on cnczone a photo of limit switch cables passing through cable glands
    Replace Internal PRT-E1500W With External - Can It Be Done?-box-connections-jpg

    an initial wiring diagram for a similar cnc machine

    Replace Internal PRT-E1500W With External - Can It Be Done?-control-box-wiring-2-jpg

    I noticed the crossed 2 wires on the Z axis motor to reverse the direction of the motor so it works with the default mach 3 settings !

    down the right hand side is the spindle motor wiring

    I suspect they use the cheapest cable available so the wire colours are not consistent from one machine to another
    or internal wiring to external cable

    NOTE the novel use of the yellow / green for the VFD V phase to the motor !!!


    John



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    Member TaffyCarl's Avatar
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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    Cheers Gent's all info is greatly appreciated.
    After watching numerous Youtube videos (such as the video below). What annoyed me was no real On/Off switch it has to be done at the wall hence my thought of sending main and spindle power through and using the On/Off switch of the semi gutted PRT-E1500W box. I suppose I could do it as most have done and flick the power off at the wall but to me that's an annoyance and untidy.
    I made the jump from an air cooled 3040 which never missed a beat in years of use, to this water cooled 6040 in November 2018 and not used it once because of the faulty box and the fact the seller, and Paypal are d**ks.
    I don't claim to be an electrical wizard, I've been stalling on re-wiring my 1966 Triumph Tiger even though I bought a complete new wiring harness and a workshop manual :-O so bare with me if I come back and ask more (simple?) questions in regards to this VFD setup.

    Cheers again
    Taff



    Last edited by TaffyCarl; 03-26-2019 at 05:21 PM. Reason: moved video


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    Member john-100's Avatar
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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    if your CNC control box is like this -

    Replace Internal PRT-E1500W With External - Can It Be Done?-cnc-router-6040t-jpg

    your IEC mains input connector is connected to a 2 pole switch (with red neon indicator) that switches the mains supply to the VFD and the stepper drivers power supply

    Replace Internal PRT-E1500W With External - Can It Be Done?-cnc-box-jpg

    it looks like they have used 2 red wires to connect the live and neutral supply to the switch
    and used 2 black wires to connect the switched the live and neutral to the VFD and stepper driver power supply



    John



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    Member TaffyCarl's Avatar
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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    As a test I ripped the VFD out of the box, isolated any possible live wires, plugged it in and it didn't go bang (bonus for me) but now have no ability to move X, Y or Z via the keyboard or pendant, only via the tab out on Mach3 screen. I can't understand why it doesn't work on the pendant as the E-Stop, spindle speed etc do so it's not the pendant - hmmm odd.

    Update:
    Sorted, Jog was off, turned it on and both the keyboard and pendant now work. The X needed reversing but that's an easy fix - just need to fine tune the set up (moves to slow) when I get the VFD and spindle sorted over the weekend and start attacking scrap board to make sure everything's right.

    Last edited by TaffyCarl; 03-27-2019 at 01:36 AM.


  12. #12
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    Default Re: Replace Internal PRT-E1500W With External - Can It Be Done?

    Good stuff..Your on to it.



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Replace Internal PRT-E1500W With External - Can It Be Done?

Replace Internal PRT-E1500W With External - Can It Be Done?