Re: Powering a Bridgeport in the UK
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I agree with John W. I have converted more than a dozen machines to use Digital Inverters (Lathes, Mills, bench saws, spindle moulders, shapers......etc.). Some using Siemens-(Teco) and others from Huanyang - all are working flawlessly. Some have been doing so (like my M300) for 15years. The down-side is you have to re-wire the machine in order to maintain the controls as they were designed. So you need to have some electrical knowledge, or employ someone who has. All my machines are fine with heavy loads and speeds (2500rpm on the M300) with the added advantage of soft start, and with the addition of some resistors, quick stop.
It basically comes down to a simple choice.
1)? Are you knowledgeable about electrics and can you confidently re-wire a machine (safely) - "Digital Inverter" 2)? You are not confident or knowledgeable about electrics and don't want to touch the machine. - "Rotary or Static Inverter" ? On that bases all the other arguments are probably unimportant.
PS. I have conversion diagrams for both Harrison M300s and Bridgeport Series 1s - if you need one.
Roo Hi all, ? I find some of the video¡¯s ¡®interesting¡¯ for a number of reasons. ? We know that ¡®static¡¯ phase converters give a mock 3 phase using a ¡®phantom¡¯ 3rd phase and that there is a definite voltage imbalance an the 3rd phase. ? Rotary phase converters effectively use a generator to give a true 3 phase. ? Inverter based systems use a Ac-dc rectifier, then electronics using high speed IGBT transistors to ¡®chop¡¯ the power which is then put back out in 3 timed streams to give the 3 phases.
This is a digital 3 phase so it doesn¡¯t have the nice sinusoidal waveform but is literally a square wave ¡®on-off¡¯.
Better systems then use capacitors to smooth the waveform and sometimes 3 transformers (as on the one I have) to take the voltage up to 400v.
It¡¯s interesting to me to note the comments about the lack of power capacity of the Digital systems, especially as the Hight Speed Trains I¡¯ve worked on (the newer ones) have all got very similar power supply system to their traction motors (and the same dynamic braking systems through resistor banks)¡¡. ? I can only say that I¡¯ve used both Static and Digital phase converters and while both have worked the digital system is by far the better option for me, powering my entire workshop and giving the option to have more than one machine in operation should I want to. I can run from a 1/4hp to a 5hp, with no changes to the set up, ?and the machines show no loss of power when being run reasonably hard.. The other added advantage is that it draws almost no power when on but with the machines not in use and it is almost silent with just the cooling fan running. ? john ? ? Here is another video expressing concerns about voltage imbalances between the 3 output legs of a DPS, Digital Phase Shifter.
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