Re: [Emc-users] VFD Tweaking

> ... > So, I reset the VFD to factory settings, and tried running from the > operator panel. Lo and behold it all worked fine, and at 100Hz I get > the full 3000rpm spindle speed that the lathe is rated for. > Oddly, the display at 50Hz / 1440 rpm _still_ only says 3.5A. There is a very strong

Re: [Emc-users] VFD Tweaking

On 7 January 2016 at 23:20, John Kasunich wrote: >> I am sure you are right, but that wasn't my point. 240V single-phase >> VFDs largely top-out at 3HP. > > Doesn't need to be single phase input. > > A single-phase input VFD has modestly up-rated diodes and caps to >

Re: [Emc-users] VFD Tweaking

On 15 January 2016 at 14:59, andy pugh wrote: > It's an interesting device, and I think I have repaired it. Pictures here: > > http://bodgesoc.blogspot.co.uk/2016/01/holbrook6.html And the latest is that the Variator now seems to work:

Re: [Emc-users] VFD Tweaking

On Wed, Jan 20, 2016, at 06:17 PM, andy pugh wrote: > On 15 January 2016 at 14:59, andy pugh wrote: > > > It's an interesting device, and I think I have repaired it. Pictures here: > > > > http://bodgesoc.blogspot.co.uk/2016/01/holbrook6.html > > And the latest is that the

Re: [Emc-users] VFD Tweaking

On 20 January 2016 at 23:49, John Kasunich wrote: > That control shaft turns easily - looks like a NEMA 23 stepper would have > no trouble controlling it. > > Although I guess sequencing is a challenge, can only adjust while running. > Are there clutches downstream of the

Re: [Emc-users] VFD Tweaking

On 01/20/2016 05:17 PM, andy pugh wrote: > I will get the lathe fully functional first, then decide > on head bearings. Bearings are listed as 387/382B Which > are available and not as frightening as I feared: >

Re: [Emc-users] VFD Tweaking

To add to this thread. It became more and more likely that the Variator was the source of the trouble, and then abundantly clear when the Variator locked up. It's an interesting device, and I think I have repaired it. Pictures here: http://bodgesoc.blogspot.co.uk/2016/01/holbrook6.html -- atp

Re: [Emc-users] VFD Tweaking

On 1/15/2016 8:59 AM, andy pugh wrote: > To add to this thread. It became more and more likely that the > Variator was the source of the trouble, and then abundantly clear when > the Variator locked up. > > It's an interesting device, and I think I have repaired it. Pictures here: > >

Re: [Emc-users] VFD Tweaking

On Thu, Jan 7, 2016, at 08:29 PM, Steve Traugott wrote: > On Thu, Jan 7, 2016 at 5:14 PM, Brian Morel wrote: > > > As far as the current issue, you need to be careful using old motors with > > a vfd. The insulation ratings of the older motors were not designed to > >

Re: [Emc-users] VFD Tweaking

On 01/07/2016 05:14 PM, Stephen Dubovsky wrote: > FWIW, I have a 7hp hitachi vfd on my Sheldon R15 (5hp motor.) running from > 1ph 240V. I found the drive cheap so I simply oversized it vs building an > external rectifier/cap. > > HAH! I can top that! I have an 11 KW Tosvert VFD on MY Sheldon

Re: [Emc-users] VFD Tweaking

On Thu, Jan 7, 2016, at 05:31 PM, andy pugh wrote: > On 7 January 2016 at 22:10, John Kasunich wrote: > > > This is rarely ever done in industry because industry doesn't want > > to pay for the extra iron, copper, silicon, and capacitors needed > > to build a 10HP motor

Re: [Emc-users] VFD Tweaking

On 7 January 2016 at 23:20, John Kasunich wrote: >> I am sure you are right, but that wasn't my point. 240V single-phase >> VFDs largely top-out at 3HP. > > Doesn't need to be single phase input. Interesting. However, it is starting to look likely that the VFD I have

Re: [Emc-users] VFD Tweaking

They do typ top out around 3HP 1ph. So just don't use them;) What John pointed out is entirely correct. The inverter runs from a rectified DC bus. There are 2 things limiting you running a 3ph vfd on a 1ph line. 1) Phase loss detection. Some big inverters will fault if they detect one of the

Re: [Emc-users] VFD Tweaking

On 7 January 2016 at 23:14, Stephen Dubovsky wrote: > 1) Phase loss detection. Some big inverters will fault if they detect one > of the phase inputs missing - it can usually be disabled in a software > setting though. OK, I wasn't aware that it could be switched off. With

Re: [Emc-users] VFD Tweaking

if they are sized on the edge and expected to work with 3 phase. John > -Original Message- > From: Stephen Dubovsky [mailto:smdubov...@gmail.com] > Sent: January-07-16 3:14 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] VFD Tweaking > >

Re: [Emc-users] VFD Tweaking

k with 3 phase. > > John > > > >> -Original Message- >> From: Stephen Dubovsky [mailto:smdubov...@gmail.com] >> Sent: January-07-16 3:14 PM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] VFD Tweaking >> >>

[Emc-users] VFD Tweaking

My lathe has a 3HP motor driven by a 3hp VFD. There is also a Kopp Variator variable speed drive, and a 2-speed gearbox with electromagnetic clutches. Running at 50Hz it thus has two speeds, 10-500rpm and 80-3000 rpm. The VFD works fine in the lower range, but in the higher speed range, unless

Re: [Emc-users] VFD Tweaking

Hi Andy. Did you fit the proper values for the paramters Group 1 and 2 ? This VFD seem to have no selftuning procedure isn't it ? In any case I do believe that the VFD is maybe too small for the motor you're running (old type). Have you tried to measure the motor current value drived without the

Re: [Emc-users] VFD Tweaking

Here's a better VFD/motor matching overview, with a pretty picture of what's going on (scroll down until you get to the schematic showing the three output PWM waves): http://www.franklin-controls.com/pump/blog/motors/ On Thu, Jan 7, 2016 at 5:29 PM, Steve Traugott wrote: > On

Re: [Emc-users] VFD Tweaking

Excellent information John! I learned something today. I may have to go with a larger motor and VFD for my mill if I decide to remove the variable sheave belt drive. On 1/7/2016 4:10 PM, John Kasunich wrote: > Actually, the domestic (input) power is not an issue. The only factor is > the cost

Re: [Emc-users] VFD Tweaking

On Thursday 07 January 2016 09:10:23 andy pugh wrote: > My lathe has a 3HP motor driven by a 3hp VFD. > There is also a Kopp Variator variable speed drive, and a 2-speed > gearbox with electromagnetic clutches. > > Running at 50Hz it thus has two speeds, 10-500rpm and 80-3000 rpm. > Those ranges

Re: [Emc-users] VFD Tweaking

On 7 January 2016 at 15:01, alex chiosso wrote: > In the VFD parameters you can setup the maximum current on the motor and > the VFD should protect itself from an overload (or it should do). That doesn't seem to be how it works. If the current goes over the specified motor

Re: [Emc-users] VFD Tweaking

What I did was reduce the maximum acceleration so the motor took less current coming up to speed. Dave Caroline -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net

Re: [Emc-users] VFD Tweaking

On Thu, Jan 7, 2016 at 5:14 PM, Brian Morel wrote: > As far as the current issue, you need to be careful using old motors with > a vfd. The insulation ratings of the older motors were not designed to > handle the voltage spikes that can occur with running motors fairly >

Re: [Emc-users] VFD Tweaking

One way to avoid the arcing problem is to add some inductance to each phase between the VFD and motor. The inductors slow down those fast switching edges and protect the motor windings. If you know what you are doing you can also add some capacitance after the inductors to get an almost perfect

Re: [Emc-users] VFD Tweaking

The lack of torque multiplication by removing a variator/gearbox can be partially solved by just using a bigger motor. Its my understanding that Monarch use a 10hp motor+VFD for 10EE retrofits instead of using a gearbox. Simple. The original MG set versions used a 3hp?? Though I have no idea

Re: [Emc-users] VFD Tweaking

On Thursday 07 January 2016 11:02:06 andy pugh wrote: > On 7 January 2016 at 15:37, John Kasunich > wrote: > > Answering the only question that I can answer immediately: > > Second question: what is the nameplate amp rating of the motor? > > If this is a 30A motor drawing

Re: [Emc-users] VFD Tweaking

I don't remember exactly where (heh) but is have seen this quote somewhere before. "If you can't fix it you don't own it." Where might I have possibly seen that? On Jan 7, 2016 2:14 PM, "John Kasunich" wrote: > > > On Thu, Jan 7, 2016, at 02:42 PM, andy pugh wrote: > > >

Re: [Emc-users] VFD Tweaking

On Thu, Jan 7, 2016, at 11:02 AM, andy pugh wrote: > On 7 January 2016 at 15:37, John Kasunich wrote: > > Answering the only question that I can answer immediately: > > > Second question: what is the nameplate amp rating of the motor? > > If this is a 30A motor drawing

Re: [Emc-users] VFD Tweaking

On Thu, Jan 7, 2016 at 10:55 AM, Gene Heskett wrote: > On Thursday 07 January 2016 09:10:23 andy pugh wrote: >> I am wondering if the 1968 3hp motor was made of bigger horses than >> the 2015 3hp VFD. > > 1 HP, I was always told, will raise a 550 lb weight 1 foot in 1 second.

Re: [Emc-users] VFD Tweaking

On 7 January 2016 at 18:10, John Kasunich wrote: >> The manual states 5A / Phase @400V but I have rewired the motor for 240V. >> >> (Maybe I should try wiring it back to 440V?) > > You wrote "5A @ 400V", and then wrote "back to 440V". Is it 400 or 440? It depends on

Re: [Emc-users] VFD Tweaking

On 7 January 2016 at 19:42, andy pugh wrote: > At a lower variator setting in high gear there is no motor movement > until 5A, then it starts to slowly build to 2000rpm at 7A. > Then a sudden increase to 18A and a trip. I should have been more explicit here. There was no

Re: [Emc-users] VFD Tweaking

On Thu, Jan 7, 2016, at 03:56 PM, andy pugh wrote: > On 7 January 2016 at 20:49, Stephen Dubovsky wrote: > > The lack of torque multiplication by removing a variator/gearbox can be > > partially solved by just using a bigger motor. > > Not really an option on 240V

Re: [Emc-users] VFD Tweaking

On 7 January 2016 at 20:49, Stephen Dubovsky wrote: > The lack of torque multiplication by removing a variator/gearbox can be > partially solved by just using a bigger motor. Not really an option on 240V domestic power. 3HP is almost certainly enough, with the reduction

Re: [Emc-users] VFD Tweaking

On 7 January 2016 at 20:29, Stuart Stevenson wrote: > I don't remember exactly where (heh) but is have seen this quote somewhere > before. > "If you can't fix it you don't own it." > Where might I have possibly seen that? I will certainly be having a look, but I am not sure I

Re: [Emc-users] VFD Tweaking

On 7 January 2016 at 22:10, John Kasunich wrote: > This is rarely ever done in industry because industry doesn't want > to pay for the extra iron, copper, silicon, and capacitors needed > to build a 10HP motor and VFD when they're only going to get > 2HP from the shaft.