Based on my limited experience the noise from the GS1 must be much worse than the GS2. I am completely happy with the GS2 drive. As you said it does everything it claims and does it well.
In fact when trying to find the noise problem I was extremely surprised that it was the 1/4hp GS1 drive. I immediately assumed it was the 3HP GS2 drive since it is much larger load. I guess the Carrier frequency of the GS2 is higher than the GS1 and probably contributes to the drive being cleaner. For future projects I will choose GS2 drives and will will not ever buy another GS1 drive. To me they are not worth the cost savings. Just my 2 cents after my experience. Thanks again for the help. Jim On 1/28/2016 2:33 PM, Dave Cole wrote: > The high end VFDs I've used recommend chokes on the output only if the > motor lead runs are hundreds of feet unless the install needs to be > super clean RF wise. > Input chokes or drive isolation transformers are pretty common for the > input, although I have seen a number installed without them. But large > high end drives have a lot different economics than a cheap GS1 drive. > If the drive costs $5000, few people complain about a $600 input choke. > > Dave > > On 1/28/2016 11:52 AM, Eric Keller wrote: >> 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 <linuxcncro...@gmail.com> 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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