Results 16 to 30 of 96
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28th Nov 2020, 09:39 PM #16Senior Member
- Join Date
- Oct 2010
- Location
- NSW
- Posts
- 177
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.
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28th Nov 2020, 11:20 PM #17Senior Member
- Join Date
- Feb 2009
- Location
- jilliby nsw
- Age
- 71
- Posts
- 111
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
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29th Nov 2020, 08:14 AM #18Senior Member
- Join Date
- Nov 2007
- Location
- Near Rockhampton
- Posts
- 270
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29th Nov 2020, 11:11 AM #19Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,183
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29th Nov 2020, 11:04 PM #20Most Valued Member
- Join Date
- Apr 2012
- Location
- Healesville
- Posts
- 2,129
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...
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11th Jan 2021, 02:18 PM #21Pink 10EE owner
- Join Date
- Aug 2008
- Location
- near Rockhampton
- Posts
- 6,216
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11th Jan 2021, 05:39 PM #22
R.C I'm still waiting, however I have been notified that a delivery is pending.
MarkI've become a tool of my tools.
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13th Jan 2021, 05:33 PM #23Golden Member
- Join Date
- Sep 2008
- Location
- Riddells Creek, Vic.
- Posts
- 831
I picked mine up from the post office today.
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14th Jan 2021, 08:33 AM #24Intermediate Member
- Join Date
- Aug 2009
- Location
- Lara, Vic, Oz
- Posts
- 46
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
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14th Jan 2021, 01:34 PM #25Golden Member
- Join Date
- Oct 2008
- Location
- Cairns, Q
- Posts
- 666
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.
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14th Jan 2021, 02:06 PM #26Most Valued Member
- Join Date
- Nov 2017
- Location
- Geelong, Australia
- Age
- 57
- Posts
- 2,651
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
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14th Jan 2021, 05:33 PM #27Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,183
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.
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15th Jan 2021, 12:15 PM #28Pink 10EE owner
- Join Date
- Aug 2008
- Location
- near Rockhampton
- Posts
- 6,216
Mine turned up today.
I wonder if the big capacitors are the main components in the increased voltage.
20210115_110915.jpgGold, the colour of choice for the discerning person.
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15th Jan 2021, 12:57 PM #29Most Valued Member
- Join Date
- Nov 2017
- Location
- Geelong, Australia
- Age
- 57
- Posts
- 2,651
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
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15th Jan 2021, 05:30 PM #30Pink 10EE owner
- Join Date
- Aug 2008
- Location
- near Rockhampton
- Posts
- 6,216
Yes it is a 4KW version. I hooked it up to the 10EE and runs the MG fine off a 10amp power point .
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.Gold, the colour of choice for the discerning person.
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