Thor, or should that be Zeus?

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Originally Posted by Neale

I'm interested in this as my lathe currently runs from an inverter from an outfit that took an ABB inverter (380-380) and fiddled with it. This outfit, no longer in business, seem to have put some kind of voltage-doubler circuitry on the input. The inverter is excellent, but the problem is that the input circuitry cannot handle heavier loads and there is too much ripple so that the inverter trips out. It's a 5HP (4KW or so) inverter driving a 3HP motor so that bit is well within its ratings.

I keep wondering about finding a suitable 240-380V transformer as per m_c's suggestion but these don't come cheap. So the Ecogoo inverters look interesting, but I'm not sure what the performance would be like at 50Hz as I'm running a conventional 50Hz motor. The motor isn't suitable for rewiring for 240V, unfortunately.

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the ecogoo is vector control- so gives great low down torque. - i drill 20mm diameter at 4000 rpm on my 24000 rpm spindle- never once stalled it.
also- for lathe you can use the 8 step preset speeds if required- so no need for variable control. and most induction motors are good for up to 75 hz with no problems- so you can up the frequency and get more speed at the same lower gearing.
with vfds running at lower rpm is where the current rises and creates more heat- then you have to force the motor with air cooling.

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Originally Posted by battwell

i run a heavy load 380v 4kw hydrovane off one- at 50hz. 3 second start up- coast to stop (doesnt like to try to slow down a hydrovane- as they stop near instant when power comes off . it draws just over 30 amp to start it - but drops to 6.9 running it. - so at 380v 50hz they perform well. at 220v i doubt the motor would start at all .
every machine in my workshop is industrial- and they all run off seperate vfds .
if anyone buys the ecogoo 9100 and needs to run modbus- i wrote instructions as they are non existant in the manual!

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I think Ill order one, just checking to see what my bonus was for last year (paid next week, yay). Do you have one spare by any chance that I could buy?

i only have my spare here- which i keep for testing - and in case of failure on any of my machines. they didnt take long to arrive

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Originally Posted by battwell

i only have my spare here- which i keep for testing - and in case of failure on any of my machines. they didnt take long to arrive

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Ok, thanks.

order a braking resistor too 50 ohm 300 watt ( ecogoo stock them around £30)

About to pull the trigger on one of these VFDs. Also very keen to get a Hydrovane. You mentioned a 4KW unit, what model is that?

What current single phase do you have, powering the HSD spindle and the Hydrovane?

Thanks

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Originally Posted by battwell

i only have my spare here- which i keep for testing - and in case of failure on any of my machines. they didnt take long to arrive

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Hi,

Do you think this would work?

https://www.reichelt.com/gb/en/from-...F&trstct=pol_9

How close to 50Ohm must it be?

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Originally Posted by battwell

order a braking resistor too 50 ohm 300 watt ( ecogoo stock them around £30)

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So, ordered, lets see how long it all takes. I was told I needed a 1000W 50 Ohm resistor, so went for that. Should provide adequate braking for my spindle.

hydrovane pulls 30 amp for about a second on startup- then drops to 7amp running. hsd never pulls more than 8 amp even when really heavy cutting. - averages around 3a

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Originally Posted by battwell

hydrovane pulls 30 amp for about a second on startup- then drops to 7amp running. hsd never pulls more than 8 amp even when really heavy cutting. - averages around 3a

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Thanks. Out of interest, how much 220V Current do you feed to each one? 32A or more?