Dresser Masoneilan SVI II AP-2, Быстрый старт

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ES-699 Rev F
Page 9 of 10
5. SVI-II AP (+) and (-) PV 1-5VDC Terminals
The Process Transmitter and the SVI-II AP 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 AP 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 barrier is MTL 788 or 788R
An example of the PV INPUT barrier is MTL 728.
Entity Parameters of the SVI-II AP PV terminals:
Vmax = 30 Vdc Imax = 125 mA Ci = 1 nF Li = 0 uH
Pmax = 900 mW.
6. SVI-II AP (+) and (-) SW Terminals
There are two independent isolated solid state switch contact outputs on the SVI-II AP. They are
labeled SW#1 and SW#2. The switches are polarity sensitive
–
that is, conventional current flows
INTO the plus terminal. An examples of suitable barriers are MTL 707, MTL 787 and MTL 787S.
Entity parameters are:
Vmax = 30 Vdc Imax = 125 mA Ci = 5 nF Li = 10 uH Pmax = 900 mW
7. SVI-II AP (1) and (2) and (3) REMOTE Terminals
The REMOTE terminals deliver reference Voltage to an optional REMOTE position sensing
potentiometer. Current, Voltage, and Power are limited by the SVI-II AP.
The REMOTE terminals entity parameters are the parameters of the 4 to 20 mA INPUT barrier.
The SVI-II AP REMOTE is approved for use as a remote position sensing device with the SVI-II
AP.
SVI-II AP Entity parameters are:
Uo/Voc = 6.5 Volts Io/Isc = 9.6 mA Ca = 22 uF La = 300 mH
Connect only to suitable potentiometer
SVI-II REMOTE Entity parameters are:
Vmax = 6.5 Volts Imax = 10.5 mA Ci = 0 uF Li = 0 Pi=68 mW
8. Digital In Terminals
The Digital In terminal is suitable for direct connection to a passive switch.
Entity Parameters are:
Uo/Voc = 6.5 Volts Io/Isc = 72 mA Ca = 1.25 uF La = 2 mH
Connect only to passive (Un-powered) switch.
9. Entity Requirement
Cable capacitance and inductance plus the I.S. apparatus unprotected capacitance (Ci) and
inductance (Li) must not exceed the allowed capacitance (Ca) and inductance (La) indicated on
the associated apparatus. If the optional Hand Held Communicator is used on the Hazardous
Area side of the barrier, then the capacity and inductance of the communicator must be added
and the communicator must be agency approved for use in the hazardous area. Also, the
current output of the Hand Held Communicator must be included in the current output of the
associated equipment.
The barriers may be active or passive and from any certified manufacturer as long as the
barriers comply with the listed entity parameters.
Specifications and References Hazardous Location Installation
A-15