sthompson
Lifetime Supporting Member + Moderator
Stu, To answer your questions:
1 Yes
2 No it shares a PS with the panelview
3 The scanner and 3 drives in one cabinet, the other three in another cabinet 3" below the first cabinet (don't ask)
4 Roughly 10-12 feet total cable length at the most.
5 I quess I'd say looped from drive to drive.
6 Thin cable
7 125Kbs baud rate
Ken,
1 To clear the "78" fault we cycle power to the drive.
2 I checked the program again to make sure that nothing is over-writting the M File for the Scanner.
3 There aren't any buttons wired to the drives.
4 Can I tie TB3-3 to the cabinet ground? Everything in these cabinets shares the same ground.
5 How is grounding TB3-3 different using the ground screws on the drive?
6 It will take me a day or two to get some logic traps programmed in to check for fault code number and duration.
Sportster:
Wow! My compliments, it is rare that we actually get timely and useful answers. If we even get an answer at all.
For the distance you are running, I don't see a big problem with your setup. Ken may see something I am missing.
In regards to the Power Supply, you wouldn't think there should be a problem, but the PanelView HMI might have a Switching Power Supply inducing noise on the 24VDC. I always put my Devicenet on its own Power Supply. Do you have a spare 24VDC Power Supply you could put on either the HMI or the Devicenet to see if the problem goes away? If you have an Oscilloscope you might want to have a look on the 24VDC Lines.
I also loop my VFDs in Cabinets in free air, and keep the cable out of the Wireway so that it is not exposed to the noise generated by the VFD T-Leads. Is that the case here, or is the Thin Cable mixed in with the VFD wiring?
How often does this problem occur, once a day, once a shift, sporadically, or multiple times then a period where it runs ok?
Also, what CompactLogix PLC and Firmware Version are you using? I presume you are using RSNetworx for Devicenet, and the matching RSLogix5000.
You Mentioned M Files, are you communicating with the VFDs through the M Files rather than mapping them as I/O? How are you sending Commands and reading Status from the VFDs?
Stu......
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