Re: [Emc-users] 240V single phase input vfd

Gregg, the 5 Hz is because - at least hereabouts - the VFDs are used mostly for ventilation drives and they start with low speed and then accelerate for noise reasons. Maybe there are also safety reasons. Peter Am 03.01.2018 um 00:43 schrieb Gregg Eshelman via Emc-users: The one I have on my

Re: [Emc-users] 240V single phase input vfd

The one I have on my old Monarch lathe, to start in higher speed gears I have to slip the clutch a bit or it'll quit with an overcurrent fault. In lower gears I can just pull the lever. There may be some programmable adjustment that can fix that, but it works as it's setup now. One crazy thing

Re: [Emc-users] 240V single phase input vfd

I run the VFD (that's never varied) on my old Monarch lathe without using braking. It has terminals to connect a braking resistor but for this machine there's no need. What I find crazy is that a simple, single function device that only converts single phase to three phase, without all the

Re: [Emc-users] Ethercat servo drive profile

On Tue, 2 Jan 2018 16:20:44 -0500 Dave Cole wrote: > On 1/2/2018 4:08 PM, Nicklas Karlsson wrote: > > I am not able to register as a user at Beckhoff > > Why not? > > I'm already signed up. > > What are you looking for?  I can do some digging. > > Dave First step is

Re: [Emc-users] Ethercat servo drive profile

On 1/2/2018 4:08 PM, Nicklas Karlsson wrote: I am not able to register as a user at Beckhoff Why not? I'm already signed up. What are you looking for?  I can do some digging. Dave -- Check out the vibrant tech

[Emc-users] Ethercat servo drive profile

I found linucnc-ethercat have some drivers for Beckhoff devices but no servo drive profile and I have not yet tested to compile the code. I am not able to register as a user at Beckhoff and standard documents are rather useful. Could anybody help out with some documentation about servo drive

Re: [Emc-users] 240V single phase input vfd

On Tuesday 02 January 2018 12:50:24 Les Newell wrote: > Hi Gene, > > Are you sure your drive isn't shutting down due to over voltage rather > than over current? The only way to brake a 3 phase motor without > pumping power back into the bus is to use DC braking. DC braking can > cause rotor

Re: [Emc-users] twopass doesn't work in pi, running jessie

On Tuesday 02 January 2018 11:56:09 Nicklas Karlsson wrote: > On Tue, 2 Jan 2018 01:31:13 -0500 > > Gene Heskett wrote: > > Greetings all; > > > > Early in the verbose output, it complains: > > twopass: loadrt hostmot2 > > hm2: loading Mesa HostMot2 driver version 0.15 > >

Re: [Emc-users] twopass doesn't work in pi, running jessie

On Tuesday 02 January 2018 11:56:09 Nicklas Karlsson wrote: > On Tue, 2 Jan 2018 01:31:13 -0500 > > Gene Heskett wrote: > > Greetings all; > > > > Early in the verbose output, it complains: > > twopass: loadrt hostmot2 > > hm2: loading Mesa HostMot2 driver version 0.15 > >

Re: [Emc-users] 240V single phase input vfd

On Tuesday 02 January 2018 11:07:19 John Figie wrote: > That would be a poor design if no braking resistor causes it to blow > up. Once the bus gets pushed up to its max limit it should let the > motor coast to a stop. > Mine has no place to hook up a braking R at all, and that is exactly what

Re: [Emc-users] 240V single phase input vfd

Hi Gene, Are you sure your drive isn't shutting down due to over voltage rather than over current? The only way to brake a 3 phase motor without pumping power back into the bus is to use DC braking. DC braking can cause rotor heating problems on machines that decelerate often. Les On

Re: [Emc-users] 240V single phase input vfd

That seems expensive. The UK price I paid for mine was £220 + £9 shipping + tax. It is very unusual for prices to be lower in the UK than the US. They will deliver to the US. I checked the prices and delivery shouldn't be more than £50 for 2-3 day delivery. This makes the total around $367.

Re: [Emc-users] 240V single phase input vfd

On Tuesday 02 January 2018 10:26:42 Eric Keller wrote: > On Tue, Jan 2, 2018 at 9:04 AM, Dave Cole wrote: > > Except that he needs a 5 hp single phase inverter. Those are a > > little harder to find and a lot more expensive... near $1000 for > > this AC Tech Drive. >

Re: [Emc-users] 240V single phase input vfd

If you have no braking resistor, or try to stop too fast for the resitor in use as the DC bus get pumped up to its maximum then the drive should fault and no longer control the motor. If the motor is allowed to just coast it will no longer pump up the bus. There are some cases where what I said

Re: [Emc-users] twopass doesn't work in pi, running jessie

On Tue, 2 Jan 2018 01:31:13 -0500 Gene Heskett wrote: > Greetings all; > > Early in the verbose output, it complains: > twopass: loadrt hostmot2 > hm2: loading Mesa HostMot2 driver version 0.15 > twopass: loadrt hm2_rpspi {config={"num_encoders=4 num_pwmgens=2 >

Re: [Emc-users] 240V single phase input vfd

On Tue, Jan 2, 2018 at 11:29 AM, Dave Cole wrote: > So what exactly do they do when the bus voltage rises during decel ?? Or > is there no decel control at all? > I've never seen a drive without braking circuitry and DC bus voltage > control. > > They do cut out when

Re: [Emc-users] 240V single phase input vfd

So what exactly do they do when the bus voltage rises during decel ??  Or is there no decel control at all? I've never seen a drive without braking circuitry and DC bus voltage control. Dave On 1/2/2018 11:07 AM, John Figie wrote: That would be a poor design if no braking resistor causes it

Re: [Emc-users] 240V single phase input vfd

See http://www.ebay.com/bhp/yaskawa-v1000 for eBay listings of Yaskawa V1000 drives. There is a new 5HP unit for us$499.50 with free shipping. I have no knowledge of the seller... > -Original Message- > From: Les Newell [mailto:les.new...@fastmail.co.uk] > Sent: Tuesday, January 02, 2018

Re: [Emc-users] 240V single phase input vfd

The Precision Electric guys are really good.   I've been in their motor rewind shop.    I was involved in a re-control job on a paper web line and they rewound some failing DC motors over Christmas.. they did a really great job. They also have a large repair area where they repair drives,

Re: [Emc-users] 240V single phase input vfd

That would be a poor design if no braking resistor causes it to blow up. Once the bus gets pushed up to its max limit it should let the motor coast to a stop. John Figie On Jan 2, 2018 9:58 AM, "Eric Keller" wrote: > On Tue, Jan 2, 2018 at 10:46 AM, Les Newell

Re: [Emc-users] 240V single phase input vfd

On Tue, Jan 2, 2018 at 10:46 AM, Les Newell wrote: > > I would avoid the Huanyang drives as they have a reputation for blowing > up. > > Les > > > My thought is they probably blow up because they have no braking circuitry installed, even internal to the drive. Unless

Re: [Emc-users] 240V single phase input vfd

I've run 3 phase inverters on single phase several times with no real problems. For example my lathe has a 7.5kw motor with a 7.5kw inverter and it works fine on single phase. I guess it helps that I am using a 240->415 auto transformer which probably has a significantly higher impedance than

Re: [Emc-users] 240V single phase input vfd

> On 2 Jan 2018, at 15:26, Eric Keller wrote: > > The Huan Yang line of VFDs sold on ebay feature a 4kw version that will run > off of single phase. The only problem with them is lack of braking on some > models. The Mach crew have figured out the modbus connections. About

Re: [Emc-users] 240V single phase input vfd

In the UK, inverterdrive.com have really reasonable prices. Probably not too useful for you but this link shows all of their 240V single phase drives . You could see if other companies local to you

Re: [Emc-users] 240V single phase input vfd

Dave, Yes I want a 5hp vfd with single phase input and that is why i am interested in the gohz GK3000-2S0037 @ $294. On amazon there are some even cheaper @$132 but there is no on line manual and i don't think a 5 hp single phase input drive can be made that cheap. I read the article you

Re: [Emc-users] 240V single phase input vfd

On Tue, Jan 2, 2018 at 9:04 AM, Dave Cole wrote: > Except that he needs a 5 hp single phase inverter. Those are a little > harder to find and a lot more expensive... near $1000 for this AC Tech > Drive. The Huan Yang line of VFDs sold on ebay feature a 4kw version

Re: [Emc-users] 240V single phase input vfd

Except that he needs a 5 hp single phase inverter.   Those are a little harder to find and  a lot more expensive... near $1000 for this AC Tech Drive. https://www.wolfautomation.com/products/ac-drives/ac-drive-5hp-208-240vac-1-3-phase-input Phase converters do have some phase current balance