Re: [foxboro] using 4-wire transmitters w/ FBM201

We are currently doing our first install of these modules too.

Our construction drawings - from the Engineering Dept - show them wired
similarly to the old style modules:

Terminal C = Loop Power from DCS
Terminal B = + In
Terminal A = - In

So a loop powered transmitter will go from C - TX - B
& an externally powered transmitter will go from B - TX - A

Having said that, we have not actually powered them up yet ;-)


Andrew McIntosh
Instrument Technician
Carter Holt Harvey
Kinleith Mill
New Zealand

> -----Original Message-----
> From: Mike_Adams@xxxxxxxxxxxxx [SMTP:Mike_Adams@xxxxxxxxxxxxx]
> Sent: Wednesday, 13 February 2002 03:59
> To:   foxboro@xxxxxxxxxxxxx
> Subject:      [foxboro] using 4-wire transmitters w/ FBM201
> 
> 
> 
> 
> Hello everyone,
> 
> We are going to be installing some 200-series FBMs soon and this is our
> first
> experience with the new style modules.
> 
> Looking at the wiring diagrams in the Foxboro document PSS 21H-2Y4 B3
> (figure
> 5-5), the wiring scheme for an I/A-powered transmitter (i.e. 2-wire) makes
> sense.  But we have some 4-20mA signals that get their power elsewhere
> (i.e.
> 4-wire), and there is not a physical DC source in the loop connected to
> the FBM.
> In this case, the Foxboro tech support people say to wire the
> transmitter's
> positive terminal to the FBM201's negative terminal (as in figure 5-5,
> just
> ignoring the external power supply).  This just doesn't seem to make sense
> and
> the fellow I talked to at Foxboro didn't seem real confident in his
> answer.
> 
> So, you folks out there who have used the FBM201, how did you terminate
> the
> wires for transmitters/signals not powered by the I/A module?  A
> plain-jane
> question but I just want get some confirmation.
> 
> Mike Adams
> Mitsubishi Polyester Film, LLC
> Greer, SC USA
> 864-879-5231
> 
> 
>  
>  
> _______________________________________________________________________
> This mailing list is neither sponsored nor endorsed by Invensys Process
> Systems (formerly The Foxboro Company). Use the info you obtain here at
> your own risks. Read http://www.thecassandraproject.org/disclaimer.html
>  
> foxboro mailing list:             http://www.freelists.org/list/foxboro
> to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
> to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
>  
 
 
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
 
foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave

Other related posts: