Re: [CAD_CAM_EDM_DRO] Re: Power Supply

> SNIP
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>>In reality the 5amp fuse was a mistake I thought I had put in a
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>10amp but the system has been running like this for several months .
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>>--
>>Ron Kline
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>>American Precision Ceramics
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>Ron what you are seeing is reality vs theory. There are a lot of
>factors that may be at work here. The motors Average current which
>is the Gecko 7 A limit times the duty factor is evidently a lot less
>than the nameplate rating. If a motor only needs 20% of the pulse
>width to move the load then the AVERAGE current over time is only
>20%. Since things like transformers and fuses can withstand short
>periods of 100% overloads the 5A fuse could easily handle 10A at 50%
>duty cycle.
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>The only real way to test is put a DC ammeter in the DC line in
>series with the load and do some measurements. A current probe on a
>scope would give you the real picture from a dynamic perspective. You
>might be surprised to see how much less the current draw is on
>average than you would calculate from the motor specs.
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>If you run mostly two axis moves then two motors would probably only
>draw 8 to 10 amps worst case. Sounds like you are not running the
>motors anywhere near their max limits.
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>Another good indicator is that things are probably not running hot:
>motors, power supply, etc are warm but not too hot to leave you hand
>on I would guess.
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>Take it as good news and don't worry about it too much. The only
>true way to design a power supply is to have the actual load in the
>actual conditions it runs in to measure then do the calculations.
>Taking numbers off components and adding them all up will only get
>you in the ballpark parking lot. We all tend to overdesign the power
>supply because of the fear of putting a lot of time and effort into
>something that ends up being too small and to combat Murphy's Law.
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>The good news is that your power supply will last a long time.
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