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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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I have a CNC lathe, a Miyano, that I just bought. The machine was made
in the early 90s. I ran it in a different shop for the last year and it worked fine. The shop had only single phase power available, like my shop. But in the old location the machine ran on solid state phase converter and in my shop it runs on a rotary converter. The line voltage at the old location was 235 volts. In my shop it is 245 volts. The machine is made to run on 230 volts. My phase converter is well balanced and the manufactured leg measures 245 volts. The problem is one three phase fractional hp motor that powers a chip conveyor. The power supply wires for this motor are wound through some sort of current sensing transformer. Thes are regular 14 gauge stranded insulated wires that appear to be hand wound through the current sensing transformer. So I'm thinking that with the higher voltage running through the wires the voltage output from the transformer is a little high and it causes the machine to alarm out on the chip conveyor. I disconnected the output from the current xmfr and the machine now does not throw an alarm, but this also removes the protection. I'm thinking that if I take a couple turns out of the xmfr then the voltage output would be lower and I can then still use the xmfr to protect the motor. Will that work? Thanks, Eric |
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