In my experience, the high-end VFDs also show filters on input and output. However, the ones I've taken apart seem to have some output filtering
On Thu, Jan 28, 2016 at 11:39 AM, Dave Cole <[email protected]> wrote: > The GS1 and even the GS2 are basic VFDs which do what they say and then > some. > I've used them in control boxes with PLCs and PCs but they are usually > the number 1 noise producers in the panel. > If you look at their installation instructions they usually include a > filter on the input of the drive and I believe for European > installations they say that > an output filter/choke is required to meet European requirements. > That makes the inexpensive GS drives not so inexpensive after all of the > filters are installed. > On the otherhand, I have used the GS2 drives on some standalone > installations without a PLC or PC nearby and they have worked fine > without complications. However, YMMV. > The built in PID loop along with a dancer arm and pot can make for a > really cheap unwinder for reeled products, like rubber extrusions etc. > Andy doesn't miss much. I wonder if he is good at picking lottery > ticket numbers?? ;-) > > Dave > > On 1/28/2016 9:14 AM, Jim Craig wrote: >> An update and semi success story. >> >> After dinking with the noise from the GS1 VFD for way to many hours. I >> was finally able to get rid of the noise. I removed the drive. I put in >> a run capacitor and have the coolant pump running off the original >> contactor. I wound up using a 3uf capacitor. I tried a 2uf and it ran >> but it ran smoother with a 3uf. >> >> I can run the machine will all features running and I don't have any >> noise at all. >> >> Based on my experience I would not recommend the GS1 drive at all. >> However if you have a need for a 1/4hp VFD let me know. I have one I >> will sell cheap. >> >> Thanks for all of the advice. >> >> Andy, Does it hurt to be right all the time? LOL! >> >> Later, >> >> Jim >> >> On 1/23/2016 6:22 AM, Dave Cole wrote: >>> You don't need to disconnect the shields at one end on the power >>> conductor shields. >>> Those are normally connected at each end. >>> >>> Dave >>> >>> On 1/22/2016 5:23 PM, Jim Craig wrote: >>>> I spent all afternoon looking for and trying to remove ground loops. I >>>> think I found all that I can eliminate. I have a couple minor ones due >>>> to the mounting of my PC motherboard/SSD that I don't think I can remove >>>> without making new mounting fixtures. >>>> >>>> I did find one that I was sure was going to fix the issue. My encoder >>>> breakout board that converts the honda connectors to RJ45 connectors had >>>> the power ground going to chassis ground due to the mounting bolts. I >>>> fixed that and removed that ground loop. I was sure that would fix the >>>> issue but it did not. >>>> >>>> Also the shields on the servo motor power cables are grounded at both >>>> ends in the motor and at the drive side. I disconnected the drive side. >>>> I am not sure if this is a good idea or not as It could pose a safety >>>> hazard. >>>> >>>> And for everyone's information the encoder cables are shielded, shields >>>> grounded at the control board only, the signals are differential and I >>>> am STILL having this issue. >>>> >>>> Anyway after all of this the noise is still present when running the GS1 >>>> drive for the coolant pump. I think I will try to source a run capacitor >>>> and switch back to a contactor for start stop on the coolant pump. >>>> >>>> The filter that I am using on the GS1 drive is a Tyco Corcom 5VB1. I >>>> don't have an operating scope to look at the noise on the lines. >>>> >>>> Thanks for the feedback everyone. Should have listened to Andy 6 months >>>> ago and went with the run capacitor then! ; ) : ( >>>> >>>> Jim >>>> >>>> On 1/22/2016 3:52 PM, Dave Cole wrote: >>>>> Are you using decent filters?? >>>>> >>>>> GS1 and GS2 drives tend to pump a lot of RF noise up the power supply >>>>> line. >>>>> I've used the AD filters with good success. I think the one I used was >>>>> about $80. >>>>> If you are using cheap Ebay filters.... sometimes you get what you pay >>>>> for. >>>>> >>>>> Have you put a scope on your AC lines to see if the filters are >>>>> effective?? I suspect they are not. >>>>> Re-routing your drive to motor leads is also sometimes effective. Keep >>>>> them as far away from low voltage wiring as possible. >>>>> >>>>> Dave >>>>> >>>>> On 1/22/2016 12:51 PM, Jim Craig wrote: >>>>>> Hey all, >>>>>> >>>>>> I have been troubleshooting some noise that I have on my servo encoders. >>>>>> I have isolated the noise source to be the 1/4hp Automation Direct GS1 >>>>>> VFD that I have running my coolant pump. If the coolant pump is not >>>>>> running then there is no noise on the encoders and the machine maintains >>>>>> correct positioning. If I turn the coolant pump on then the encoders get >>>>>> false signal that in turn changes where the machine thinks it is. This >>>>>> problem showed up immediately after I retrofitted the machine this last >>>>>> summer. I have just now been able to diagnose where the issue is >>>>>> originating. >>>>>> >>>>>> In attempts to improve the situation I have done the following. >>>>>> Installed EMI filters on the supply lines to both the coolant >>>>>> and >>>>>> spindle vfds. >>>>>> worked on ground system to try to isolate the noise. >>>>>> rerouted the coolant pump motor power cable completely away >>>>>> from >>>>>> any other cables and completely away from the machine. >>>>>> >>>>>> All of these things have failed to improve the noise issue. >>>>>> >>>>>> I also tried the following to try and diagnose the issue. I disconnected >>>>>> the coolant pump motor cable from the coolant pump vfd. Disconnected the >>>>>> spindle motor from the spindle vfd. Connected the coolant pump to the >>>>>> spindle vfd. Note that the spindle vfd is a 3.0hp Automation direct GS2 >>>>>> drive. >>>>>> >>>>>> When I did this and ran the coolant pump via the spindle vfd there was >>>>>> no noise on the encoders. >>>>>> >>>>>> Does anyone have any ideas on how to get rid of this issue. I really >>>>>> want to make some parts but I can't with the noise issue. >>>>>> >>>>>> I talked to a EE buddy of mine and he mentioned running both motors >>>>>> (spindle and coolant pump) off the same 3.0hp GS2 drive just to get me >>>>>> going. What do you think about this? Will running two different sized >>>>>> motors on the same VFD cause any issue. Right now I don't run my spindle >>>>>> in reverse so I would not have any trouble with the coolant pump running >>>>>> backwards. >>>>>> >>>>>> I talked to Automation Direct and they said that the GS1 is more prone >>>>>> to noise than the GS2. I am contemplating getting a 1/2hp GS2 to replace >>>>>> the GS1. >>>>>> >>>>>> So frustrated right now. >>>>>> >>>>>> Let me know if you have any ideas. >>>>>> >>>>>> Thanks, >>>>>> >>>>>> Jim >>>>>> >>>>>> ------------------------------------------------------------------------------ >>>>>> Site24x7 APM Insight: Get Deep Visibility into Application Performance >>>>>> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month >>>>>> Monitor end-to-end web transactions and take corrective actions now >>>>>> Troubleshoot faster and improve end-user experience. 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