Author Topic: 3 Phase inverter EG8030 EGS031  (Read 10591 times)

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Offline robmar

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Re: 3 Phase inverter EG8030 EGS031
« Reply #15 on: March 30, 2017, 04:45:47 pm »
So... here we are!

Inverter powered up and running smoothly  :D  (just a brief initial panicking because, being the multi-turn voltage adjustment trimmer factory preset to almost full travel, on first power up the output voltage jumped abruptly to a worrisome 460V   :o)
But after adjustment I got a steady three phase 380V 50Hz featuring a nice sine wave from a 48Vdc input.
Now for the heavy load tests... (as soon as I find some suitable resistor)
Stay tuned!

Roberto

Offline Mulver

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Re: 3 Phase inverter EG8030 EGS031
« Reply #16 on: April 27, 2017, 06:17:56 am »
Hey Roberto, Any update on your load tests?

Cheers Shane

Offline jimbo007

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Re: 3 Phase inverter EG8030 EGS031
« Reply #17 on: July 27, 2017, 10:59:21 pm »
Nice !  :D

Offline lighthunter

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Re: 3 Phase inverter EG8030 EGS031
« Reply #18 on: August 05, 2017, 06:23:03 pm »
A couple years ago, I set up a rotary phase converter (50hp) to run a cnc lathe and mill for a small machine shop starting up. It was quite a bit cheaper than the power company. It isnt a perfect solution but it does work.

Input voltage is 245v single phase then power runs through two parallel 80A toroids connected as 35v buck to drop voltage to 210 then 50hp rpc, for 3-phase 208. With the balancing caps it worked real well. 2 months down the road we added a 30kw isolation transformer because one of the cnc inverter designs dumps regnerative braking power between its 208 legs and ground (120v) or supposed to be xcept without the isolation transformer one of the output from the delta rpc is the dreaded wild leg which blew up a drive. Thus the need for isolation.

It has worked ok since with the exception of twice now a run capacitor on the rpc has melted down due to terminal connections i would guess.  They have since upgraded the lathe to a larger machine, which required a bit of adjustment to the balance.

Because of the noise and these two cap failures, the boys (the owners) want to get rid of the rpc and use an inverter instead.  I will be visiting them tomorrow morning about it.

My opinion is the rpc is way more reliable than an inverter. What do you guys think?? If they insist, would the 30kw inverter in the link below be a suitable choice? Could i simply jumper the 3-phase inputs for single phase input?? May need to add an external rectifier and connect to buss?

Or should i consider the eg031 egp3000w build and connect some large igbts to it to get the 30kw? I think I have some dual igbt packs that would work for this. I would rather have them choose an off the shelf unit so they arent dependent on me. Any thoughts much appreciated!

 http://m.ebay.com/itm/TOP-GIN-30KW-40HP-MOTOR-INVERTER-VARIABLE-FREQUENCY-DRIVE-VFD-200-220V-3PHASE-/282251886988?nav=SEARCH
Health Warning: May contain traces of nut!
LH