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 />
Supplemental Power Supply<br />
Another approach is to boost the compliance voltage of the DCS using a supplemental<br />
power supply (see Figure 68 on page 121) with the split ranged <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> connected in<br />
series with the supply. It is not practical to use supplemental supplies when Intrinsic<br />
Safety is required. The barriers do not permit adequate voltage. Contact the DCS vendor<br />
to verify that the output circuit is compatible with the added voltage. The supplemental<br />
voltage must equal 9.0 V for each additional <strong>SVI</strong> <strong>II</strong> <strong>AP</strong>. Exceeding the values in Table 16<br />
will cause damage if the signal wires are short-circuited.<br />
Table 16<br />
Supplemental Voltage for Split Range<br />
Number of <strong>SVI</strong> <strong>II</strong> <strong>AP</strong>s on a Current Loop Maximum Allowable Supplemental Voltage<br />
1 0<br />
2 9.0 VDC<br />
3 18.0 VDC<br />
Verify Wiring <strong>and</strong> Connections<br />
For split range installations there are additional constraints on the split range system: the<br />
minimum span must be 5 mA; the upper range value must be 8 mA to 20 mA; the lower<br />
range values must be 4 mA to 14 mA.<br />
Use the following procedure to ensure that the <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> split range system is properly<br />
powered:<br />
Connect a DC voltmeter across the input terminals.<br />
For an input current value between 4 <strong>and</strong> 20 mA the voltage varies between 11 V<br />
<strong>and</strong> 9 V respective.<br />
Current is read from the local display or with a milliampmeter installed in series the<br />
<strong>SVI</strong> <strong>II</strong> <strong>AP</strong>.<br />
When voltage exceeds 11 V check that polarity is correct.<br />
If voltage is less than 9 V <strong>and</strong> polarity is correct, voltage compliance of current<br />
source is inadequate.<br />
Connect a milliampmeter in series with the current signal. Verify that source can<br />
supply 20 mA to <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> input.<br />
If 20 mA is not attainable, see troubleshooting.<br />
NOTE<br />
Improperly or inadequately grounded installations can cause<br />
noise or instability in the control loop. The internal electronic<br />
components are isolated from ground. Grounding the case is<br />
unnecessary for functional purposes but grounding the case<br />
may be necessary to conform to local codes.<br />
120
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