Baker Hughes Masoneilan SVI II ESD Quick Start Manual page 95

Distributed Control Systems Configurations
This section gives guidance for configuration in a DCS application. Figure 25 gives two general-
ized drawings that cover DCS applications to ensure switch safety.
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SVI
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SVI
Switch
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Configuration Considerations
© 2018 Baker Hughes, a GE company, LLC. All rights reserved.
Wiring Option #1
Resistance ≥ 30 Ohms +
wire resistance.
Negative switch pole must be directly wired to negative power supply.
Wiring Option #2
Resistance = Sized so that
circuit is limited < 50 mA
in-rush current.
Any load (no direct connection).
Figure 25 DCS Switches Wiring Options
A typical value for 24 AWG cable about 0.025 Ohm/ft (see Wiring Option #1)).
If IS barrier is a combination of fuse, resistor and Zener diode then the
connection is shown in Option #2. The barrier must have adequate
resistance to limit inrush current, as the fuse cannot limit inrush current (see
Wiring Option #2).
Power source requirements:
V 30 V. I 1 A.
max
Power source requirements:
V 30 V. I 1 A.
max
Masoneilan SVI II ESD Quick Start Guide =| 95
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