Instrument Power 0VDC Referenced to Ground?
Instrument Power 0VDC Referenced to Ground?
(OP)
I'm looking for what is considered best practice as far as referencing the negative (common) side of a 24VDC instrument power system to ground.
This is the instrument power (not signal) for 4-wire transmitters (not loop powered transmitters).
Are there any pros / cons to doing it?
My thought was that it would be safer as voltages in the field would be sure not to float above 24V, but my staff tell me that they are worried of shorting out instruments if the + is accidentally grounded during maintenance.
Any IEEE or other references on this?
Thanks in advanced,
Jan T.
This is the instrument power (not signal) for 4-wire transmitters (not loop powered transmitters).
Are there any pros / cons to doing it?
My thought was that it would be safer as voltages in the field would be sure not to float above 24V, but my staff tell me that they are worried of shorting out instruments if the + is accidentally grounded during maintenance.
Any IEEE or other references on this?
Thanks in advanced,
Jan T.





RE: Instrument Power 0VDC Referenced to Ground?
RE: Instrument Power 0VDC Referenced to Ground?
Any Pros / Cons for floating the 24VDC vs grounding it?
RE: Instrument Power 0VDC Referenced to Ground?
Sometimes, it is good to "ground everything everywhere". But that does not seem to be the first choice in instrumentation. More so in automation and drive applications.
Gunnar Englund
www.gke.org
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