Baker Hughes Masoneilan SVI II AP Series, Quick Start Manual

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Masoneilan SVI II AP Digital Positioner Quick Start Guide = | 109
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General Configuration Notes
The SVI II AP supports two identical contact outputs, SW #1
and SW #2 (Digital Output switches), that can be logically
linked to status bits.
The switches are polarity sensitive and must be connected only
to a DC circuit. The switch (+) terminal must be electrically
positive with respect to the (–) terminal. If the (+) terminal is
electrically negative with respect to the (–) terminal, then the
switch will conduct, regardless of switch state.
If the switch is connected directly across the power
source, the current will be limited only by the capacity of
the power source and the switch can be damaged.
This section discusses the necessary precautions when
configuring a system.
Without a load, when the switch is on (closed) the external
voltage would be dropped across the switch.
This damages
the switch
(Figure 34).
Figure 34 Switch Installation Drawing without Load: Configuration
Not Allowed
SVI II AP
Switch
Output
External
Voltage
Source
NOT ALLOWED
Full voltage
drop is
occurring
across the
switch (no
current limit in
place)
+
-
-
+
B: Optional Switch
Load Limits