Thanks Joe, that's what I suspected. Oh well, I'll just keep using it the way I have been. I must admit I don't miss the things I've never had. :;
Printable View
Thanks Joe, that's what I suspected. Oh well, I'll just keep using it the way I have been. I must admit I don't miss the things I've never had. :;
Just wondering if a 3 phase motor running on 240v single phase via a VFD can be made reversible?? or do I convert to single phase reversible?? What would be the simplest electrical guru's. Thanks for your wisdom & input
Good one steve, i had wondered when you were going give that thing a test run.
I have a 7.5 hp motor on my lathe running off a 415 - 415v vfd about the same physical size as the one that steve has, it looks too small to do what it does. It fitted nicely into the electrical cabinet on the back of the lathe so i fitted a fan and air vent and a temp controller and fixed the sensor to the fan outlet of the vfd. The strange thing is that the vfd barely ever gets over ambient temperature.... and it only cost 140 bucks on ebay...
R.C I'm still waiting, however I have been notified that a delivery is pending.
Mark
I picked mine up from the post office today.
Picked my one up yesterday too, looks pretty good, impressed with the compact size, now to put it to work on the lathe!
Cheers
Si
My apologies for clicking on the request for pictures in the initial post. I meant to click on "Like this post". Pictures in that post are fine, and thanks for the review.
From your description I will consider buying one next time (if ever) I have the opportunity to buy a good value machine with a three phase 415V motor, something I have avoided in the past because it is not financially practical to connect 3 phase to my shed, and a perceived idea that the VFDs previously available require at least some technical expertise to set up. From your description it sounds as though this one is relatively foolproof to set up if it worked straight out of the box. Where electric/electronic equipment is involved I rate fairly on the scale of fools, so would be a good test case!
I have toyed with the idea of buying a VFD in the past, but only one of perhaps 7 or 8 electricians who have done domestic work here at home admitted to a little experience with VFDs. Twenty five years ago when I was still working in sugar mills I was friendly with a couple of mill electricians who would have been very familiar by now with such equipment: alas, both have inconveniently died in the last few years.
Frank.
Thanks Frank.
There's very little config to be done on these ones out of the box to get to the point where you've got a motor running on the standard 50Hz frequency. From there, tweaking minor settings such as acceleration and deceleration times is easy too.
It does get a bit more technical when you start to get into using external controls and switching etc, and then another step up in difficulty if you want to integrate it into the original controls on a machine.
The simplest scenario is where you have a machine with a single motor and on/off switch. In that situation you can just ignore the on/off switch on the machine and connect the VFD directly to the motor and supply and use the controls on the VFD panel itself.
Steve
It's not only the simplest scenario it is also the safest scenario for both the VFD and the motor. Unless suitable precautions are taken there should be no switches between the motor and VFD. Turning the motor off under load using a switch between the Motor and VFD can blow components in the VFD and can damage the insulation in the motor.
Mine turned up today.
I wonder if the big capacitors are the main components in the increased voltage.
Attachment 390395
Yours is the 4kW version .RC. ?
I just received another 2.2kW one today and it doesn't have the big caps like that, so I suspect they are probably related to the extra current through yours, to keep the DC side smooth.
I think my new one will end up on the T&C grinder....
Steve
Yes it is a 4KW version. I hooked it up to the 10EE and runs the MG fine off a 10amp power point :D.
The unit indicates at idle the MG draws 1.8A, which I suspect is per phase on the three phase side. Running the lathe no load at 2500rpm it goes up to 6amps.
These units if reliable and long lasting are bits of game changers for your older machinery with just a single motor to run everything.