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Old 04-23-2007, 03:49 PM
smithb98 smithb98 is offline
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Default MY Power Supply Has Me Confused - can't control Current

First post here. Love the forum. Wish there was more traffic! First off, I set up my Copy Cad system last night. Plated a couple of nuts and bolts that came out surpirisingly nice considering I am having this issue. I understand that it is current that matters, not voltage. I have a 10Amp constant current/constant voltage power supply (Mastech - appears identical to the units Caswell sells) hooked up. Tried to plate a couple nuts and bolts last night that totaled around 22 square inches which at .14 amps/sq-in should have needed about 3 amps. Problem is, I could not get the power supply to work in that range. It will operate between .00-.04 amps or between 6 and 10.

If I turn it on with the knobs cranked up, the current will show up to 10amps. I then try to adjust the current knob down and it will let me get to about 6 amps. If I try to go any lower, it'll drop down to .4 amps and won't go back up. The only way to get it to go back up above .40 amps is to turn the unit off, adjust the current knob back up and turn the unit back on, it will show 6+ amps. Again, try to turn it down and at 6 amps, it'll drop down to .40. Make sense?

The power supply didn't come with instructions. Any ideas?
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