Analog With Discrete Safety Demand (A/Dsd) Configuration - GE Masoneilan SVI II ESD Installation And Maintenance Manual

Analog with Discrete Safety Demand (A/DSD)
The Analog with Discrete Demand configuration is: 4 - 20 mA power input with superimposed
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HART communications for control system and 24 VDC 2 wire for Safety System (Figure 53).
Control System
or Safety System
Figure 53 Analog with Discrete Safety Demand (A/DSD) Configuration
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HART Wiring Guidelines
In order for the SVI II ESD to communicate, the SVI II ESD must be physically connected to a
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HART compliant network. "Connecting to the Control Loop" outlines wiring the SVI II ESD.
Connecting to the Control Loop
The SVI II ESD PST controller MUST BE grounded according to local regulations. It is important
to maintain correct polarity at all times, otherwise the PST controller may not operate
properly. Physically connect the SVI II ESD to the HART
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HART Communication Foundation. A shielded cable is recommended.
To connect the Control Loop to the SVI II ESD:
1. Connect one end of the cable to the control loop's 4 - 20 mA output.
2. Remove the threaded wiring covers on the PST controller.
3. Connect the other end of the cable to the SVI II ESD. There are two threaded openings on
the PST controller. Use the opening with the red plastic insert.
4. Maintain polarity + and - respectively.
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=GE Oil & Gas
AO
Setpoint 4- 20 mA+ HART
Safety System
DO
Safety Trip Signal Discrete 3 VDC- 24 VDC
4 Wire Solution -Safety Function Triggered by Discrete 0 - 24 VDC Signal (3VDC = Safety Trip)
Position Retransmit: when wiring this feature:
NOTE
Wire using the same gauge wire as for the 4-20 mA control loop.
In general, ensure that it is connected to the control system's
analog systems card.
Ensure the control loop is powered when using a meter to make
any measurements.
SVI II ESD
®
loop using a cable specified by the
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