Cabling And Interconnection Requirements; Capacitance Vs. Length Of Cable For Hart; Hart® Filter Required For Certain Control System Output Circuits - GE Masoneilan SVI II ESD Installation And Maintenance Manual

Cabling and Interconnection Requirements

Interconnections are made using shielded twisted pair cables. Shield is connected to ground
at one point only. It is customary to ground the shield at the controller or intrinsic safety
barrier. SVI II ESD is supplied with two 1/2" NPT conduit entries. M20 adapters are available.
Internal and external ground terminals are provided for case grounding requirements.

Capacitance vs. Length of Cable for HART

®
The HART
preserve signal strength. Refer to standards for detailed calculation methods.
®
HART Filter Required for Certain Control System Output Circuits
The SVI II ESD is intended for use with all control systems. However, output circuits of several
major DCS systems are incompatible with the tones used for HART
that DCS or controller works reliably with HART
external HART
MTL manufactured HART
composed of passive circuitry that introduces negligible voltage drop. For additional
information, contact MTL.
178 |
=GE Oil & Gas
Install the SVI II ESD in accordance with local and national code in
WARNING
both general and hazardous area locations. Substitution of
components can impair suitability for use in hazardous locations.
The internal electronic components are isolated for ground.
NOTE
Grounding the case is unnecessary for functional purposes.
Grounding the case may be necessary to conform to local codes.
Communications Foundations specifies cable capacitance requirements to
Do not connect a HART
CAUTION
unless the controller is HART
Loss of control or a process upset can occur if the controller output
circuit is not compatible with HART
®
filter must be installed between the field wiring and the output card, such as
®
filter HCU16AO model. It is a 16 channel DIN rail mounted device
A control circuit must be HART
NOTE
installed. Contact the manufacturer of the controller or DCS. See
"HART® Filter Requirements" on page 191. of this manual for
more information
®
®
modem and a PC to a control circuit
®
compatible or has a HART
®
protocol. When the DCS is incompatible an
®
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®
signals.
®
signals. You must verify
compatible or have a HART
®
filter.
®
filter