Baker Hughes Masoneilan SVI II ESD, Быстрый старт

Страница: 89 / 100

© 2018 Baker Hughes, a GE company, LLC. All rights reserved. Masoneilan SVI II ESD Quick Start Guide =
|
89
Doc Number ES-727
Revision W
PDR ECO-
0029774
11/15/2017
Written By P.Levesque 13DEC2006
Checked T.Kabir 10JAN2007
Filename ES-727.DOC Page 11 of 13 Approved T. Kabir 10JAN2007
Copyright 2017 as an unpublished trade secret. This document and all information herein is the property of Dresser LLC. It is confidential
and must not be made public or copied and is subject to return upon demand.
8.3.2 SVI II ESD 4-20mA OUT Terminals (+) and (-)
These terminals provide a 4 to 20 mA signal related to valve position. The 4 to 20 OUT terminals
behave much like the terminals of a transmitter so a Transmitter type barrier with 250 Ohm series
resistance (internal or external) is used for this connection (Example: MTL 788 or 788R).
Use of the 4-20 OUT feature is certified to ATEX intrinsically safe requirements and is approved for use
in Zone 0. Use of the 4-20 mA OUT feature has not been certified by FM or CSA. The 4-20 mA OUT
feature may not be used in an intrinsically safe installation when FM or CSA intrinsically safe approval
is required. The 4-20 mA OUT feature is certified by FM and CSA for use in a DIV 2 area and in a DIV
1 area when the SVI II-ESD2 is installed in accordance with flameproof requirements.
Table 2, 4-20mA OUT Entity/NIFW Parameters
Vmax Imax Ci Li Pmax
Entity Parameters 30 VDC 125 mA 8 nF 1 uH 900
8.3.3 SVI II ESD PV 1-5VDC Terminals (+) and (-)
The Process Transmitter and the SVI II-ESD PV Input are both barrier protected. The transmitter 4 to 20
mA signal is converted to 1 to 5 volts at the Transmitter barrier. The 1 to 5 volt signal is monitored by
the DCS and used by the SVI II-ESD for the embedded process controller. The sense resistor may be in
the barrier or in the Digital Control System.
The Process Transmitter must be approved for use with the Process Transmitter Barrier. An example of a
suitable Process Transmitter barrier is MTL 788 or 788R. An example of the PV 1-5VDC Terminal
barrier is MTL 728.
Table 3, PV 1-5VDC Entity/NIFW Parameters
Vmax Imax Ci Li Pmax
Entity Parameters 30 VDC 125 mA 1 nF 0 uH 900
8.3.4 SVI II-ESD SW Terminals (+) and (-)
There are two independent isolated solid state switch contact outputs on the SVI II-ESD. They are
labeled SW#1 and SW#2. The switches are polarity sensitive
– that is, conventional current flows INTO
the plus terminal. Examples of suitable barriers are MTL 707, MTL 787 and MTL 787S.
Table 4, SW 1 & SW 2 Entity/NIFW Parameters
Vmax Imax Ci Li Pmax
Entity Parameters 30 VDC 125 mA 4 nF 10 uH
8