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25-09-2020 #1
When they say reduced performance on single phase, it shouldn't be by much. The main difference is that the input current is shared between 4 rectifier diodes rather than 6. The dc voltage ripple inside is slightly higher but of no concern. It should work identically, with a slight (10-20%) reduction in S1 continuous power rating. I'd be interested to hear what derating they recommend.
I'd be surprised if you got anywhere near 7.5kW continuous shaft power on a machine like this. I'm guessing you bought this for low speed torque as much as anything, at which operating point the input power will be a fair bit less than 7.5kW. Personally I wouldn't bother with the expense of installing 3 phase when you could spend that money on more machine tools....
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25-09-2020 #2
Thanks Muzzer.
Ive been quoted around £4500 for 3 phase. I am limited at this type of machine at current levels but it remains an option.
Yep, I was willing to take a chance on this setup and running it on Single Phase. It will certainly use all the current available to it but yes, 7.5 KW of actual cutting load is a lot. If the machine is sold to someone else, at least they know its capable if connected to a suitable power supply but for my needs, I doubt Ill ever need that.
The hardinge has a belt / pulley setup so I Can mess with ratios to get what I need but yes, generally low torque for materials that are hard or like thread cutting where you might be using slow RPM but need the torque.
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25-09-2020 #3
The SZGH engineer I spoke to estimated around 20% derate on the 11Kw 1200rpm Motor I got for the Fadal.
I won't be running it on a single phase but did ask so if I sell it to someone I can tell them the Derate. I haven't fitted it yet so can't confirm this but I will run it on single-phase to see the difference.-use common sense, if you lack it, there is no software to help that.
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Web site: www.jazzcnc.co.uk
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