HELP - Blowing Fuses & melting Switches


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    Default HELP - Blowing Fuses & melting Switches

    I have a couple of the red 60W 500x70mm machines and both of them have been blowing fuses.

    The first unit melted an e-stop switch and then started to blow fuses to the point the machine won't do more than power up and blow a fuse.

    Our second machine seems to have melted the main power switch and is also blowing fuses.

    Any pointers would be great!

    Tim

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    Default Re: HELP - Blowing Fuses & melting Switches

    Hi Tim

    going by the poor quality the connectors use in my "mini lathe" resulting in high resistance connections

    its possible the E-stop & power switch was damaged by the heat from poor connections

    do the switch wires show signs of head damage ??


    the question is did faulty e-stop switch & power switch cause damage to the laser cutters power supplies and / or laser power supplies ??

    or the over current taken by a faulty power supplies and / or laser power supply damage the switches ??

    I would replace the damaged switch & blown fuse then disconnect the mains supply from the laser power supply
    and then test the controls power supply on its own

    depending on the result ,then test the laser tubes power supply on its own

    John



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    The e-stop on one machine was the first to show heat damage and I replaced it.

    I have the main power switch on both machines show signed of heat damage.

    Any good places to get better quality switches from?

    Tim



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    Default Re: HELP - Blowing Fuses & melting Switches

    Hi Tim

    living in the UK I would start with
    Farnell element14 UK - Electronic Components Distributor
    RS Components | Electronic and Electrical Components

    but I assume your in USA so try
    https://www.digikey.com/
    Mouser Electronics - Electronic Components Distributor

    from the likes of E-bay its not easy to know how good spare parts will be - they may be as bad as the suspect ones fitted to your machine


    John



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    Default Re: HELP - Blowing Fuses & melting Switches

    The main power switch I have not looks more like the e-stop linked below but both sides are green. Is that NO/NO or NC/NC?

    Emergency Push Button Switch with lock



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    Default Re: HELP - Blowing Fuses & melting Switches

    Hey, I got a 60W Chinese laser in January and I had the same issue. I thought I posted in this forum, but I can't find it.

    Here is what I found after 1) Melting the main switch, 2) Melting the E-Stop swtich, and 3) Blowing a fuse and melting the fuse holder.

    The #1 tip I can give you is to make sure you are NOT running your exhaust fan or air assist pump from the AC outlets on the back of the machine.


    The exhaust fan that was included with my machine was rated at something like 6A or 550W--all of this power has to go through the main fuse if you use the outlet on the back of the machine. This really only leaves about 4A to power the laser, and if you have to use over 70% power or are running a long cutting job, it can melt switches (thats what happend to me.) The power plug on my fan was not a US style plug, so I had to cut and replace the end to make the switch (found a replacement extension cable plug at a local hardware store).

    Double-check the rating on your main fuse. The ones that came with the machine were rated for 250v/10A, which will not reliably blow at 10A at 120V; this is probably why the switches are melting first (Also 10A rated)

    In getting my machine back up and running, I replaced the main power switch with a 20A metal toggle switch. It is overkill, but it works great. The fuse should blow first anyway. The E-Stop should have a red contact block, the main switch a green contact block. The only real difference (aside from the style of switch) is the E-Stop is normally closed, and the Main Power is normally open.

    My new setup has the Laser Cutter, Air Pump, Water Pump, Water Chiller and Exhaust Fan all running on their own outlet on a shared surge protector (nothing on the back of the laser)--I've had no power issues since.



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    Default Re: HELP - Blowing Fuses & melting Switches

    Quote Originally Posted by TimAustinTX View Post
    I have a couple of the red 60W 500x70mm machines and both of them have been blowing fuses.

    The first unit melted an e-stop switch and then started to blow fuses to the point the machine won't do more than power up and blow a fuse.

    Our second machine seems to have melted the main power switch and is also blowing fuses.

    Any pointers would be great!

    Tim
    Just replacement them..or add a breaker, it is safer.

    E-mail:nolan@thunderlaser.com facebook:https://www.facebook.com/ThunderLaser
    Facebook Laser Cutter Tech Support: https://www.facebook.com/groups/lasercuttertechsupport


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    Default Re: HELP - Blowing Fuses & melting Switches

    Quote Originally Posted by Nolan Yang View Post
    Just replacement them..or add a breaker, it is safer.
    I disagree, circuit breakers are slower to react and are too easy to simply reset after they have tripped, assuming circuit breaker and fuse are correct rating for the load.

    A fuse requires some checking of the circuit before replacing (assuming someone doesn't want to just blow another fuse), I've seen my share of circuit breakers simply reset into a short circuit resulting in arc flash and further equipment damage.

    Fuses are faster to clear a fault resulting in safer operation and typically less damage to equipment.

    Ceramic fuses with a correct load rating and fault clearance rating should be used.



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    Default Re: HELP - Blowing Fuses & melting Switches

    The "best solution" is just replace, and when it happens again, and replace it again..
    However, if you don't want to replace it often, I think breaker is an options, but don't reset it right away when it breaks.

    E-mail:nolan@thunderlaser.com facebook:https://www.facebook.com/ThunderLaser
    Facebook Laser Cutter Tech Support: https://www.facebook.com/groups/lasercuttertechsupport


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    Default Re: HELP - Blowing Fuses & melting Switches

    Quote Originally Posted by Nolan Yang View Post
    The "best solution" is just replace, and when it happens again, and replace it again..
    However, if you don't want to replace it often, I think breaker is an options, but don't reset it right away when it breaks.
    Sorry to disagree but but a fuse that blows or a breaker that pops is telling you something is wrong i.e. not right!

    The correct action would be to investigate what is pulling more current than the circuit is designed for then replace, rewire, or redesign the circuit.

    Fuses and breakers should never go in a correctly functioning circuit.

    Bending bits of metal in Hertfordshire - http://ddmetalproducts.co.uk


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    Default Re: HELP - Blowing Fuses & melting Switches

    Um..you're right. I just share a lazy solution..

    E-mail:nolan@thunderlaser.com facebook:https://www.facebook.com/ThunderLaser
    Facebook Laser Cutter Tech Support: https://www.facebook.com/groups/lasercuttertechsupport


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    Default Re: HELP - Blowing Fuses & melting Switches

    No worries

    I only mentioned it as these machines get put in the home etc and keeping on flicking a breaker or fitting fuses usually leads to overheating which can lead to fires etc.

    Much better to fix the problem and be safe.

    Bending bits of metal in Hertfordshire - http://ddmetalproducts.co.uk


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HELP - Blowing Fuses & melting Switches
HELP - Blowing Fuses & melting Switches