Baker Hughes Masoneilan SVI II ESD Quick Start Manual page 42

Analog with Discrete Safety Demand (A/DSD)
The Analog with Discrete Demand configuration is: 4 - 20 mA power input with superimposed
®
HART communications for control system and 24 VDC 2 wire for Safety System (Figure 14).
Control System
or Safety System
Safety System
4 Wire Solution -Safety Function Triggered by Discrete 0 - 24 VDC Signal (3 VDC = Safety Trip)
Figure 14 Analog with Discrete Safety Demand (A/DSD) Configuration
HART ® Wiring Guidelines
In order for the SVI II ESD to communicate, the SVI II ESD must be physically connected to a
®
HART compliant network. "Connecting to the Control Loop" outlines wiring the SVI II ESD.
Connecting to the Control Loop
The SVI II ESD positioner MUST BE grounded according to local regulations. It is important to
maintain correct polarity at all times, otherwise the positioner may not operate properly. Physi-
cally connect the SVI II ESD to the HART
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 positioner.
3. Connect the other end of the cable to the SVI II ESD. There are two threaded
openings on the positioner. Use the opening with the red plastic insert.
4. Maintain polarity + and - respectively.
42 | =BHGE
AO
Setpoint 4- 20 mA+ HART
DO
Safety Trip Signal Discrete 3 VDC- 24 VDC
®
loop using a cable specified by Field Comm
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SVI II ESD
®
. A shielded