Corey,
Attached is a helpful hint regarding the use of Hart
Communicators
With FBM01/05.
HH#: HH956
IA INFO: mjc0000
File: Solaris/NT/Venix Release: 4.2.x and up
Date: Sep 18, 2000
Subject: M275 HART Communicator interfacing with FBM01/FBM05
Source: TAC Problem
Description: The M275 HART Communicator not working on
FBM01/FBM05 loops.
Solution: At each of the input channels placing a 1.0uF,
50Vdc, non-polarized ceramic disk capacitor
(H0110CW or equivalent) across the "+P" and "-" terminals at
the FBM01/FBM05's termination
cable will correct the problem. Note: To limit the energy
that can be discharged to the field,
it is critical that a resistor is connected between the side
of the capacitor connected to the "+P" terminal
of the Termination Cable and the field. When the FBM01/FBM05
is connected to an Intelligent Transmitter,
a 200 W in-line resistor assembly (P0902VY) is required in
the loop and is intended to be connected at the FBM's
Termination Cable's terminals. This in-line resistor can
serve as the energy-limiting device when the 1.0uF
capacitor is installed at the FBM's Termination Cable. The
200 W resistor must be installed in the same
enclosure as the FBM01/FBM05.
Regards,
Freddy Why
AFH Devers - Engineering Services South Africa
A division of Protea Data Systems
Email Address: [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>
Website: http://www.protea.co.za <http://www.protea.co.za>
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-----Original Message-----
From: Corey R Clingo
[SMTP:[EMAIL PROTECTED]]
Sent: Thursday, March 15, 2001 9:24 PM
To: Foxboro DCS Mail List
Subject: Drop resistor on analog
input cards
Does anyone know if I/A analog input cards (FBM01/04
in my case) can be had with
250-ohm dropping resistors? My meter tells me the
ones we have are 50-ohm, and
most HART handhelds we've used require 250-ohm loop
resistance to function
properly.
TIA,
Corey Clingo
Sr. Engineer
BASF Corp.
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