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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Cabling <strong>and</strong> Interconnection<br />
Wiring an <strong>SVI</strong> <strong>II</strong> <strong>AP</strong><br />
Cabling <strong>and</strong> Interconnection Requirements<br />
Interconnections are made using shielded twisted pair cables. The shield is connected<br />
to ground at one point only. The signal loop is grounded at only one point in accordance<br />
with plant electrical st<strong>and</strong>ards. It is customary to ground the signal at the controller or<br />
intrinsic safety barrier. The <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> is supplied with two 1/2" NPT conduit entries. M20<br />
adapters are available. Internal <strong>and</strong> external ground terminals are provided for case<br />
grounding requirements.<br />
WARNING<br />
NOTE<br />
Install the <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> in accordance with local <strong>and</strong> national<br />
code in both general <strong>and</strong> hazardous area locations.<br />
Substitution of components can impair suitability for use in<br />
hazardous locations.<br />
The internal electronic components are isolated for ground.<br />
Grounding the case is unnecessary for functional purposes.<br />
Grounding the case may be necessary to conform to local<br />
codes.<br />
Capacitance vs. Length of Cable for HART<br />
The HART Communications Foundations specifies cable capacitance requirements to<br />
preserve signal strength. Refer to the st<strong>and</strong>ards for detailed calculation methods.<br />
CAUTION<br />
Do not connect a HART modem <strong>and</strong> a PC to a control circuit<br />
unless the controller is HART compatible or has a HART<br />
filter. Loss of control or a process upset can occur if the<br />
controller output circuit is not compatible with HART signals.<br />
HART Filter Required for Certain Control System Output Circuits<br />
The <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> is intended for use with all control systems. However, output circuits of<br />
several major DCS systems are incompatible with the tones used for HART signals.<br />
You must verify that the DCS or controller works reliably with the HART protocol. When<br />
the DCS is incompatible an external HART filter must be installed between the field<br />
wiring <strong>and</strong> the output card. MTL manufactures the HART filter HCU16AO. It is a 16<br />
channel DIN rail mounted device composed of passive circuitry that introduces<br />
negligible voltage drop. For additional information, contact MTL.<br />
NOTE<br />
A control circuit must be HART compatible or have a<br />
HART filter installed. Contact the manufacturer of the<br />
controller or DCS. See “HART Filter Requirements” on<br />
page 125. of this manual for more information.<br />
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