Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
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<strong>GE</strong> Oil <strong>and</strong> Gas<br />
<strong>SVI</strong> <strong>II</strong> <strong>AP</strong> Instruction Manual<br />
Split Range Applications<br />
The <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> is designed to operate in split range configurations supporting up to three<br />
control valves connected to a single controller output. Minimum input current span for<br />
each <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> is 5 mA. For each positioner the upper range value is between 8 <strong>and</strong> 20<br />
mA <strong>and</strong> the lower range value is between 4 <strong>and</strong> 14 mA. For example, three devices might<br />
be configured with input current ranges of 4 - 9 mA; 9 - 14 mA, <strong>and</strong> 14 - 20 mA. Split<br />
range operation with <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> requires special consideration of the compliance voltage.<br />
The <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> requires at least 9.0 V. Two <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> in series requires at least 18.0 V in<br />
addition to the voltage drops in wiring <strong>and</strong> other series devices. Typical controller output<br />
current sources rarely deliver 24 V, so the system can become voltage starved. It is<br />
possible to boost the compliance voltage of the DCS using a series wired voltage source<br />
power supply, as shown in Figure 68 on page 121. The total loop voltage must not exceed<br />
the rating for the controller output current source. Contact the DCS vendor to validate this<br />
approach.<br />
NOTE<br />
The internal electronic components are isolated from ground.<br />
Grounding the case is unnecessary for functional purposes.<br />
Grounding the case may be necessary to conform to local<br />
codes.<br />
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