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Masoneilan SVI II ESD Installation and Maintenance Manual
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© 2017 Baker Hughes, a GE company, LLC. All rights reserved.
HART
®
DCV Setup
Provided below are instructions for setting up the HART Multiplexer HMU16-P250 for DCV
mode application.
HART
®
Module Positions
The MTL4841 communications module is mounted in the first available position nearest to
RS485 connection terminals. The MTL4842 module is mounted in the last available position
nearest to field wiring terminations.
Field Wiring
Wiring terminations are shown in Figure 89. The transmitter’s and the valve’s Tx+ terminal is
used to supply 24 VDC to the field device. On the system side, the transmitter signal is
measured across Ch+ and Ch- while valve signal is simply returned to 0 VDC.
Figure 89 HART
®
Device in DCV Application
RS485 link
to host
24V HART
MUX power
System
Terminals
TX+
Ch+
Ch-
TX+
Ch+
Ch-
Field
Terminals
TX+
Ch+
Ch-
TX+
Ch+
Ch-
MTL 4842 Multiplexer Module
Reserved Slot*
NTL 4841 Communications Module
TX
I/P
HMU16-P250
HART
+24 VDC
Signal -
MTL4842
expansion bus
+24 VDC
0 VDC
Summary of Contents for SVI II ESD
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