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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? the DC should not be grounded unless there is a three phase isolation transformer feeding the input to the contactor. 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" Since the output from the scr pack is DC it cannot be a current transformer. It is most likely a variable reactor with a ac input and the other pair of wires is the output. The more current flowing through the heavy wires the more saturated the core of the transformer and the amount of ac passed from one winding to the other is diminished. Newer units use Hall effect detectors. John Karl |
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