Baker Hughes Masoneilan SVI II AP, Quick Start Manual

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Distributed Control Systems Configurations
This section gives guidance for configuration in a DCS application. Figure 36 gives two general-
ized drawings that cover DCS applications to ensure switch safety.
Figure 36 DCS Switches Wiring Options
Configuration Considerations
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
max

1 A.
SVI
Switch
Resistance ≥ 30 Ohms +
wire resistance.
+
-
Negative switch pole must be directly wired to negative power supply.
+
-
Wiring Option #1
SVI
Switch
Resistance = Sized so that
circuit is limited < 50 mA
in-rush current.
+
-
Any load (no direct connection).
+
-
Wiring Option #2
Power source requirements:
V

30 V. I
max

1 A.