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  1. #1
    Registered
    Join Date
    Oct 2008
    Posts
    114

    Blowing Fuses After a Power Outage

    hey folks need some advice -

    After tripping over the mains 240v cable on my JCUT 6090b and hearing it spark at the kettle socket end (machine end) it now keeps blowing fuses...

    Initially was in the 5v-12v transformer (see image 1) at the 3amp glass fuse, but since changing the mains 5amp wall fuse to 3amp thats the one that keeps blowing now on every fire up (soldered a new glass 3amp into the transformer) .

    The kettle socket end did come loose hence the initial spark but is fully inserted now.

    Also whats odd is at the point of power up its the mains 240v live into the transformer that flashed when i power up (which then blows the mains fuse)

    If I disconnect the 240v live into the transformer the machine powers up (vfd and drives are all energised).

    Any help appreciated - i am an engineer but not an electrical engineer

    Attachment 408008



    Circled point "A" is where i now get a flash at power up. Disconnecting the live and neutral here prevents the fuse blow (so drives see power ok)
    , but obviously no power now to spindle control board and smooth stepper

    Click image for larger version. 

Name:	new wiring - Copy.jpg 
Views:	0 
Size:	152.4 KB 
ID:	408010

  2. #2

    Join Date
    Jan 2005
    Posts
    10009

    Re: Blowing Fuses After a Power Outage

    Quote Originally Posted by JQ_Quint View Post
    hey folks need some advice -

    After tripping over the mains 240v cable on my JCUT 6090b and hearing it spark at the kettle socket end (machine end) it now keeps blowing fuses...

    Initially was in the 5v-12v transformer (see image 1) at the 3amp glass fuse, but since changing the mains 5amp wall fuse to 3amp thats the one that keeps blowing now on every fire up (soldered a new glass 3amp into the transformer) .

    The kettle socket end did come loose hence the initial spark but is fully inserted now.

    Also whats odd is at the point of power up its the mains 240v live into the transformer that flashed when i power up (which then blows the mains fuse)

    If I disconnect the 240v live into the transformer the machine powers up (vfd and drives are all energised).

    Any help appreciated - i am an engineer but not an electrical engineer

    Attachment 408008



    Circled point "A" is where i now get a flash at power up. Disconnecting the live and neutral here prevents the fuse blow (so drives see power ok)
    , but obviously no power now to spindle control board and smooth stepper

    Click image for larger version. 

Name:	new wiring - Copy.jpg 
Views:	0 
Size:	152.4 KB 
ID:	408010
    I would say that the power supply has failed, you have a short somewhere, do you have this wired correct with a Ground wire on the Ground Terminal
    Mactec54

  3. #3
    Member
    Join Date
    Aug 2019
    Posts
    1
    Hi JQ_Quint...
    Can you email me at 'everybodylovesraymond111213@gmail.com'
    Thanks buddy...
    Last edited by Drambui66; 08-14-2019 at 12:57 PM.

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