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i talked to the guy at auto tech who has the same setup on a machine of his own. he said that the 110 volt input inverter does put out 220 volts but i think that is not true. i get 129 volts on the true RMS meter on the AC setting. it is my understanding that this should read high not low. don't want to risk killing the scope unless i have my real voltage divider or high voltage probe.

i think that some of the parameters are not what they seem using strange numbers instead of what would be intuitive. i went through all the parameters and set them to what the support guy said and think i am getting more power from the motor. i really have no idea what might have been the important change if any. i set the motor parameters as follows? 141? 220 142 high as possible, 7 on my inverter 143? 2 (2 pole motor) and PD144 at 3000 this is supposed to be max speed which is supposed to be 24000 but 3000 seems to be the correct setting???

i loaded the spindle by pressing a block against the spindle nut. i did this before and think i was not able to get more than 1.1 amps showing on the display. i had broken a bit when trying various feed speeds and it seemed that the motor had very little power. now with the parameters as above, i can get three amps and the inverter does not go into protection. when i broke the bit it went into protection mode and shut off, requiring a power cycle to reset and i can't imagine that the load was very high. it is possible that some fluke sent an impossible move that instantly loaded the spindle but it did not sound like that. i think that something in the settings caused protection to trip at some very small current load.

anyway, whether i am getting 220 volts at the motor really does not matter as long as the thing cuts well. when i get the nerve i am going to creep the feed speeds up using an old bit that i don't mind breaking and see how the motor sounds.

maybe it is better to experiment with high speed steel bits instead of carbide?

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Spencer,

Exactly what type of inverter did you get for your motor/spindle, do you have a link?

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Andy and Brendon,

Thanks!

Turns out they’re not quite as rare as hen’s teeth but still not very common as far as I can see. I looked at the Eaton Moeller website and the only ones I found there was for 115V single phase input. Drives Direct EBAY store did have a couple of larger (>2HP) ones capable of stepping up the voltage from 230V to 400V. But again, this is not something your normal type inverter can do, it has to be specifically designed for it – and most aren’t.

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/Henrik.

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Hi Henrik:

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I have a 1.5hp drive that takes 120VAC single phase and puts out 240VAC 3-phase. It is an Eaton Moeller MMX11AA4D8F0-0.

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Andy Wander

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Best regards, Spencer Chase
67550-Bell Springs Rd.
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Laytonville, CA 95454 UPS only.
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