Hey everyone.
Thanks for all the ideas.
Just a couple of thoughts.
I'm in New Zealand so need a nz source of parts or it gets to expensive for
shipping.
And my drive is a 400v drive I think dc bus voltage gets up to about 650vdc.
Sounds like I need to do some resistance calculations..
On Saturday 26 December 2020 12:35:17 Dave Cole wrote:
> I'm sure those could be made to work if they are of an acceptable Ohms
> range, but how do you mount them?
> They are just elements.
> Most braking resistors on larger machines are in cages on the top or
> side of the control panels.
> For
I'm sure those could be made to work if they are of an acceptable Ohms
range, but how do you mount them?
They are just elements.
Most braking resistors on larger machines are in cages on the top or
side of the control panels.
For small drives, they are oftentimes just screwed to the panel
On 12/24/2020 11:43 AM, Dave Cole wrote:
Automation Direct sells braking resistors.
https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/vfd_accessories/braking_units_-a-_resistors
Looks like the cheapest one is about $30.
I've used
Automation Direct sells braking resistors.
https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/vfd_accessories/braking_units_-a-_resistors
Looks like the cheapest one is about $30.
But unless you are hitting the brakes constantly, they
On 12/24/2020 02:18 AM, Chris Albertson wrote:
"All the time?"When you have a hard requirement like this is when some
detailed engineering can pay off.Assume you are reversing at 50% duty
cycle and burning 1KW 50% of the time. Where I live this can cost 12
cents per hour. This is $89
On Thursday 24 December 2020 03:18:24 Chris Albertson wrote:
> "All the time?"When you have a hard requirement like this is when
> some detailed engineering can pay off.Assume you are reversing at
> 50% duty cycle and burning 1KW 50% of the time. Where I live this
> can cost 12 cents
"All the time?"When you have a hard requirement like this is when some
detailed engineering can pay off.Assume you are reversing at 50% duty
cycle and burning 1KW 50% of the time. Where I live this can cost 12
cents per hour. This is $89 per month if you actually do run "all the
time".
like a lathe
> > might or the need to stop super fast.
> >
> > Todd Zuercher
> > P. Graham Dunn Inc.
> > 630 Henry Street
> > Dalton, Ohio 44618
> > Phone: (330)828-2105ext. 2031
> >
> > -Original Message-
> > From: Jon El
dles don't have the rotating inertia that other machines like a lathe
> > might or the need to stop super fast.
> >
> > Todd Zuercher
> > P. Graham Dunn Inc.
> > 630 Henry Street
> > Dalton, Ohio 44618
> > Phone: (330)828-2105ext. 2031
> >
> >
On 12/23/2020 06:55 PM, andrew beck wrote:
Just to tag in.
I need a braking resistor for my cnc mill spindle it's a 7.5kw vfd.
Needs to rigid tap all the time etc
Any ideas? I like the idea of a stove element..
Just need to know some values etc
Get the 11" stove elements. A 2400 W
; > > Todd Zuercher
> > > P. Graham Dunn Inc.
> > > 630 Henry Street
> > > Dalton, Ohio 44618
> > > Phone: (330)828-2105ext. 2031
> > >
> > > -Original Message-
> > > From: Jon Elson
> > > Sent: Tuesday, Decembe
On Thu, 24 Dec 2020 at 02:17, andrew beck wrote:
> I need a braking resistor for my cnc mill spindle it's a 7.5kw vfd.
> Any ideas? I like the idea of a stove element..
The VFD manual will suggest a resistance and power. But I would
imagine there is a fairly wide acceptable range. (especially
630 Henry Street
> > Dalton, Ohio 44618
> > Phone: (330)828-2105ext. 2031
> >
> > -Original Message-
> > From: Jon Elson
> > Sent: Tuesday, December 22, 2020 8:51 PM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Chec
e-
> From: Jon Elson
> Sent: Tuesday, December 22, 2020 8:51 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Checking vfd hookup question?
>
> [EXTERNAL EMAIL] Be sure links are safe.
>
> On 12/22/2020 06:30 PM, Matthew Herd wrote:
> > In
On 12/22/2020 8:50 PM, Jon Elson wrote:
Using too low a resistance won't harm the MOTOR, it will blow the
power brick in the VFD.
Right. The newer drives chop current off the DC bus to the braking
resistor to lower the DC bus voltage as the motor slows.
I'd find out what they
On Wednesday 23 December 2020 08:33:16 Todd Zuercher wrote:
> I doubt you'd really need a braking resistor for running a router
> spindle (what I believe you have.) Simply test it without one, as
> long as you don't get overvoltage alarms on the VFD when decelerating
> you should good without it
.
Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
-Original Message-
From: Jon Elson
Sent: Tuesday, December 22, 2020 8:51 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Checking vfd hookup question?
[EXTERNAL EMAIL
From: Matthew Herd [herd.m...@gmail.com]
Sent: Tuesday, December 22, 2020 4:30 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Checking vfd hookup question?
CAUTION: This email originated from outside the Walla Walla University email
system.
In my research on resistor sizing, I
On 12/22/2020 06:30 PM, Matthew Herd wrote:
In my research on resistor sizing, I heard reports that Haas uses stove
elements for their braking resistors. On factory machines, no less. Of course
that’s second hand, so I can’t say it’s true.
Yes, absolutely. Our Haas at work has a stovetop
On Tuesday 22 December 2020 18:43:08 Ralph Stirling wrote:
> Yes, the DCM terminal is the digital common for FWD and REV.
Good, that how I hooked it up but haven't powered it yet. I generally rig
my stuff with a couple 40 amp SSR's to control motor power from the F2
key. But that cable is not
In my research on resistor sizing, I heard reports that Haas uses stove
elements for their braking resistors. On factory machines, no less. Of course
that’s second hand, so I can’t say it’s true.
> On Dec 22, 2020, at 7:15 PM, Chris Albertson
> wrote:
>
> I knew some one who found he could
For my 1.5kw Hitachi WJ200 drive, the manual recommends 50 ohm. However,
they want you to buy their resistor so they don't spec a recommended
wattage. I ended up using a 400W wirewound resistor from Ohmite, part
number ARG400C50RJ. It didn't even get warm when I was running my rigid
tapping
The brake resister depends on what duty cycle you run the motor at. It
you only run forward at a constant speed you will never use the resister.
But if you continuously run the motor to full forward then full backward
speed for hours you will be heating the resister with about 50% of the
Is this a Chinese drive? I have seen a lot of strange nomenclature on
Chinese drives.
M in a German sense, oftentimes denotes "mana" which is a common. I
have seen M or "mana" used to denote a low voltage common. So does the
M in DCM, stand for "mana"? Perhaps? Perhaps the drive was
)
Subject: [Emc-users] Checking vfd hookup question?
CAUTION: This email originated from outside the Walla Walla University email
system.
Greetings all;
Swapping a 110 volt vfd, for a 250 volt vfd, one of the terminals is
labeled differently, the common point of the fwd/rev/spd1-2-3-4-5
terminals
Greetings all;
Swapping a 110 volt vfd, for a 250 volt vfd, one of the terminals is
labeled differently, the common point of the fwd/rev/spd1-2-3-4-5
terminals on the 110 volter is labeled XGND
But the common point terminal on the higher voltage unit is labeled DCM
but the diagram of how to
27 matches
Mail list logo
