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Problems reading HART values when G120 starts

8/22/2023 9:00 PM	Rate (0)
Philamico16 Posts: 1 Rating: (0)	I have a remote terminal unit (RTU) for a fresh water well equipped with a Seimens G120 32kw drive and I have ET200sp with a HART module reading a flow meter on channel 1. I can get the HART values for the primary and secondary variables when the drive is not running, however, as soon as I start the drive, either from the IOP or remote start command in logic, I loose the HART communications. For testing purposes I started the down hole submersible pump with a motor starter and the HART maintained. I don't have any tags or addresses duplicated. Any advice???
Philamico16 Posts: 1 Rating: (0)
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8/23/2023 9:14 AM	Rate (0)
Hati Platinum Member Joined: 9/21/2012 Last visit: 12/30/2025 Posts: 4836 Rating: (512)	Do you use a screened motor cable for the VFD <-> Motor? How about proper grounding of the equipment? Is you sensor cable placed next to the motor cable in the cable tray?

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8/23/2023 4:22 PM	Rate (0)
danw Gold Expert Joined: 3/28/2010 Last visit: 12/30/2025 Posts: 1202 Rating: (220)	It's an electrical noise issue. The VFD creates electrical noise which corrupts the digital HART signal. Gotta look and grounding, shielding, and cable routing.

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8/23/2023 11:46 PM	Rate (0)
danw Gold Expert Joined: 3/28/2010 Last visit: 12/30/2025 Posts: 1202 Rating: (220)	The definitive collection of HART diagnostics is Jonas Berge's LinkedIn FAQ: https://www.linkedin.com/pulse/new-tips-tricks-get-value-out-hart-jonas-berge/

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