After this problem has some type of resolution you must remember If it has tits or wheels it will cost money and cause problems. :)
On Mon, Dec 1, 2014 at 8:03 AM, Todd Zuercher <zuerc...@embarqmail.com> wrote: > Then let her have it. > > It won't do her any good and it won't sell for much, (especially if it > isn't working.) > > Then buy it back at what ever auction she has to unload it at, for a > fraction of its worth to you. > > > ----- Original Message ----- > From: "Karlsson & Wang" <nicklas.karls...@karlssonwang.se> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Sent: Monday, December 1, 2014 12:46:40 AM > Subject: Re: [Emc-users] EMC communication problem then motor start > > I found this http://www.x2y.com/publications/dcmotors/feb14-05.pdf > document which may be useful for others, observe however it is written by > the company who sell the GOOD components. The noise is there, it worked on > the table but disturb communication on real, hopefully I will be able to > test again this weekend. Biggest problem right now is my wife during > divorse want four times as much for machine as I bought it for and she do > not want me to have it. > > Nicklas Karlsson > > > > On Sun, 30 Nov 2014 20:51:06 -0500 > Dave Cole <linuxcncro...@gmail.com> wrote: > > > I've had a couple of installations where filters were required and in > > both cases the problem was that the drives (servo drives recently, VFDs > > previously) were pumping noise back into the AC line which got into the > > other power supplies and or radiated onto the low voltage circuits and > > caused problems. In both cases input line filters mounted close to the > > drives isolated the noisy drives from the rest of the control system. > > > > Most servo motor drive cables supplied with the servo drives are > > shielded and those generally don't seem to cause problems however I try > > and keep the encoder feedback cables as far apart from the motor cables > > as practical - such as opposite sides of a cable tray etc. > > > > VFD motor cabling should be in their own conduit/metallic sealtite or in > > sheilded cable. > > > > Dave > > > > On 11/27/2014 1:12 PM, Kirk Wallace wrote: > > > On 11/27/2014 08:32 AM, Karlsson & Wang wrote: > > >> A small value capacitor decrease the problem so I guess the > > >> commutation spikes are the problem but driving a capacitive load is > > >> not good. > > >> > > >> Nicklas Karlsson > > > (My general view on noise) > > > One should not expect to simply run a wire from a signal source to an > > > input in a machine environment and expect it to just work. Machines > tend > > > to be electrically and magnetically noisy, and signal inputs tend to > > > have very high impedance. It's like the cable is a bottle and wind is a > > > noise source. Wind going over the end of a bottle will create a sound > > > which can drown out any sound you need to hear. > > > > > > To fix this one can reduce the noise and/or increase the sound level of > > > the signal. > > > > > > I found that AC line filters on VFDs or any switching power supply is > > > pretty much required. I had spindle encoder noise on the far side of my > > > lathe which was cleared up using AC mains filters on the VFD power > > > inputs and ferrite beads on the motor leads, thus reducing the noise > > > source. Sometimes an AM radio or oscilloscope probe can be used to scan > > > for noise sources, but I usually just add the filters anyway. > > > > > > After reducing noise sources, the susceptibility for the bottle or > > > rather cable to be affected by noise can be addressed. Shielding is the > > > most obvious approach, but more often, line conditioning is the real > > > issue. A bottle will make sound due to a pressure wave, starting from > > > the top of the bottle and travels down to the bottom and bounces back. > A > > > wire will do the same thing, and the source of the reflected wave could > > > be the signal itself as well as noise. One way to stop the pressure > wave > > > from reflecting is to put a hole in the bottom, changing the bottle's > > > bottom from high impedance to low. There are many ways to configure a > > > wire to handle a signal, generally through termination and filtering. > > > Much of this has been worked out already, so the methods for handling > > > the type of cable being used should be studied and put into practice. > > > > > > Another way to deal with noise is to boost the signal above the noise > > > level. That is why RS-232, RS-422/485 run with a much higher voltage > > > than USB, SPI or I2C. RS-422/485 use two wires, one with a positive > > > signal, the other with a negative version of the signal. Noise affects > > > both wires the same way, but the difference stays the same, so the > noise > > > is ignored. > > > > > > So for each signal: > > > What is the nature of the signal? (driver and input) > > > What is the nature of the wire? (impedance, configuration, termination, > > > filtering) > > > What is the nature of the noise environment? (suppression, shielding) > > > What method best addresses the above? (which industrial standard) > > > > > > > > > > --- > > This email is free from viruses and malware because avast! Antivirus > protection is active. > > http://www.avast.com > > > > > > > ------------------------------------------------------------------------------ > > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > > from Actuate! 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