Baker Hughes Masoneilan SVI II ESD Quick Start Manual page 41

SVI II ESD Configurations
There are three possible SVI II ESD installation configurations each with a different wiring
scheme.
Analog Safety Demand (ASD)
The Analog Safety Demand configuration is: 4 - 20 mA signal, power and trip signal with super-
®
imposed HART communications (Figure 12).
Control System
or
Safety System
2 Wire Solution - Safety Function Triggered by Current Sensing (5.6 mA = Safety Trip)
Discrete Safety Demand (DSD)
The Discrete Safety Demand configuration is: 24 VDC, power and trip signal with superimposed
®
HART communications (Figure 13).
Control System
or
Safety System
Safety Function Triggered by Discrete 0 - 24 VDC Signal (3 VDC = Safety Trip)
© 2018 Baker Hughes, a GE company, LLC. All rights reserved.
Analog Safety Demand (ASD)
Discrete Safety Demand (DSD)
Analog with Discrete Safety Demand (A/DSD)
AO
4 - 20 mA + HART
Figure 12 Analog Safety Demand (ASD) Configuration
High Impedance
Device Required
for HART Signaling
DO
24 VDC + HART
Figure 13 Discrete Safety Demand (DSD) Configuration
SVI II ESD
.
SVI II ESD
Masoneilan SVI II ESD Quick Start Guide =| 41