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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Power supply
Karl Townsend wrote:
Turns out I have a power supply for my Matsurra bedmill. After stripping everything not needed away I ended up with this: http://www.metalworking.com/dropbox/supply1.jpg http://www.metalworking.com/dropbox/supply2.jpg A few questions. Each of the twelve diodes has a pair of wires, 24 connections on the terminal strip. I don't know the function here and if anything needs to be connected. Is the part labeled 1 an isolation transformer? If so, should DC- be grounded? Can the part labeled 2 be used to read current? There are four leads, how would they be connected. The part says "Nana Electronics NNC-05AF" Karl That part is half of a DC drive unit for a DC spindle motor. The parts that look like diodes are actually SCR's since there are 12 of them it is a full wave unit vs. a half wave unit using a center tapped Y type transformer with the center tap being the motor return attach point. The vfd you are going to dismantle is probably the other half of this unit. The "transformer" attached to the unit is the reactor to keep harmonics from getting back into the power line. The unit could be used to build a nice regulated dc power supply if you can find the rest of the stuff to go with it. Follow the leads that went to the 12 thin wires on the terminal strip. Instead of having the tach feedback from a motor you could use a voltage divider feedback into the tach input ( you may have to isolate the input) to regulate the output voltage. John |
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