:smile:
Just hope it works.... New in box..
100.00:smile::smile:
VFD037EL23A
5hp
Just hope it works.... New in box..
100.00:smile::smile:
VFD037EL23A
5hp
Look what I found on Ebay for 100.00
- Thread starter pescadoman
- Start date
Nice Randy,
Once you get a taste of the VFD's for motor drives, you won't go back to regular single phase. After looking at what is inside the boxes I think they should be a lot cheaper than what they currently are. Maybe I am wrong on this ,but just seems that way to me.
Neil
Once you get a taste of the VFD's for motor drives, you won't go back to regular single phase. After looking at what is inside the boxes I think they should be a lot cheaper than what they currently are. Maybe I am wrong on this ,but just seems that way to me.
Neil
If using new Tekno motor spindle. it not a good idea to use that. The warranty is voided if not using brand like delta , fuji, hitachi actech or so.
i know of 2 people that spindles blew up with cheap china inverter. One was $600 and other $1300 .Blew spindle first start . You lose. Both inverters shorted out inside which burnt spindle
You also want a vector drive to get the most out of spindle
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Can you explain? The spindles would seem to be "inverter-duty", since they are designed to run more than 60hz.
From Automationdirect website...
Line reactors used on the output side of a drive (load reactors) protect the motor insulation against AC drive short circuits and IGBT reflective wave damage, and also allow the motor to run cooler by "smoothing" the motor current waveform. Output reactors are recommended for operating "non-inverter-duty" motors and for any motors when the length of wiring between the AC drive and motor exceeds 75 feet.
By the way, the inverter wasn't the one I expected. It's still new, but first generation. Should be fine...
Not exactly sure what you want me to explain. The comment was in response to "Both inverters shorted out inside which burnt spindle" from your automation direct post--protect the motor insulation against AC drive short circuits. As for the "Inverter duty" or "inverter rated" how do you know? There is no NEMA standard on inverter rates motors. with IGBT's firing inside a VFD windings are going to get hot. Also the drive is generating shaft voltage which damages your bearings over time. line reactors help with these conditions.
RBC
Deceased
This is interesting.
I've not been aware of line reactors, especially in the use for our small spindles.
I looked into it, and didn't seem to find anything that would be fitting for our application. Maybe I just don't know how to size them properly.
In a typical application for me, the spindle's I use run at a 400 hz max which equate to 24000 rpm. If my memory serves me right, that means it's a single pole 3 phase motor. I'm not sure what the DC buss voltage is coming out of the VFD, but I do know that I see very low current. Maybe 2 amps at startup and stop, and less than 1 to 1.2 when cutting.
Is there a good type or size of line reactor for this load type?
I wouldn't mind investing in a few if it protects my spindles.
Thanks
Royce Bunnell
www.obcues.com
Forgive me, but wouldn't ANY motor that is designed to be run +/- 60HZ be deemed inverter duty?
Would your line reactor also apply to 3ph-3ph inverters or is it more of 1ph-3ph?
In the future, please quote what you are referring to.
Until today, I didn't know line reactors existed.
Hello Royce,
Generally Dc bus voltage is 600 to 700volts.
As far as sizing current is the first consideration. After that use Z=V/I and the answer times the % rating of reactor. 2 amps at guessing 480 volts = 240*3% = 7.2 insert for impedance in L=XL/(2πFL)--several online calculator for this at 400 hz = 18086.4 and that can be translated into 19mH the answer is at the micro level. That is a rather large inductor. You may have to go to the closest standard size of current rating and closest impedance. Most drive Manufacturers have filter guides for cross reference their reactors to the supported drives. AB and Siemens for sure, possibly Automation direct not familiar with there drives have heard good things though.
Hope this makes sense and i didn't mess any thing up sometimes have a problem getting all the facts out. kinda obvious with first post. AB has some good literature on reactors also.
Generally Dc bus voltage is 600 to 700volts.
As far as sizing current is the first consideration. After that use Z=V/I and the answer times the % rating of reactor. 2 amps at guessing 480 volts = 240*3% = 7.2 insert for impedance in L=XL/(2πFL)--several online calculator for this at 400 hz = 18086.4 and that can be translated into 19mH the answer is at the micro level. That is a rather large inductor. You may have to go to the closest standard size of current rating and closest impedance. Most drive Manufacturers have filter guides for cross reference their reactors to the supported drives. AB and Siemens for sure, possibly Automation direct not familiar with there drives have heard good things though.
Hope this makes sense and i didn't mess any thing up sometimes have a problem getting all the facts out. kinda obvious with first post. AB has some good literature on reactors also.
Link to a good AB article about reactors. Pros and cons. http://www.ab.com/support/abdrives/documentation/techpapers/Line Reactors and AC Drives1.pdf
Again they aren't necessary at all but can help your system. Also that looks like a good pick up for 100.00 from eBay after looking at the AD site.