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Thread: Power supply question

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    Power supply question

    I bought a 500 W ATX power supply to power-up my stepper motors. Unfortunately as soon as I run a program in Mach2 the power supply shuts down immediately. After turning off and back on it fine again. Does the power surge pop an internal fuse? What can I do to prevent that?

    P.S. I posted that question already this morning but it doesn't show up....
    so here again


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    Quote Originally Posted by ruttkowb View Post
    I bought a 500 W ATX power supply to power-up my stepper motors. Unfortunately as soon as I run a program in Mach2 the power supply shuts down immediately. After turning off and back on it fine again. Does the power surge pop an internal fuse? What can I do to prevent that?

    P.S. I posted that question already this morning but it doesn't show up....
    so here again

    You need to load the 5 volts output with 1-2 Amperes minimum (5 or 2.5 ohm 10 watt resistors) in order to get a stable output on the 12 volts., that load should be applied all the time. Those resistors will be hot, so keep them attached to a heat-sink or use a fan to keep them cooler...


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    Thanks! I will try that out!


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    Registered ImanCarrot's Avatar
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    Agrees... there is a good demonstration of converting an ATX power supply on the web. I'm sure I googled it using "atx" and "power supply". It said about putting a load across a couple of pins and heatsinking the resistor.

    Watch out if you've got a Dell PSU, they used their own wiring spec, which was different to everyone elses between certain years and you could blow the thing up!
    I love deadlines- I like the whooshing sound they make as they fly by.


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    Registered audioandy1762's Avatar
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    Here is a link to a good site

    http://www.wikihow.com/Convert-a-Com...b-Power-Supply

    Andy


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    Thanks again! That is what I need. I thought already I can through that thing away...


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