Baker Hughes Masoneilan SVi 1000 Instruction Manual

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Baker Hughes Masoneilan SVi 1000 Instruction Manual Manual pdf 87 page image

Masoneilan SVi1000 Positioner Instruction Manual =| 87© 2017 Baker Hughes, a GE company, LLC. All rights reserved.System Connections ConsiderationsAll system connections must comply with the HART® Communications ProtocolSpecifications. For complete technical information refer to the Field Comm® Group,Document Number HCF-SPEC-11 and the references. The SVi1000 is a HART® compliantdevice of type Actuator. It is therefore a receiver of 4 - 20 mA, and cannot have a voltagesource applied to its input terminals.CAUTION Applying a voltage can cause damage and void the warranty.When installing the SVi1000 in a 4 - 20 mA current loop, the engineer designing the loop mustconsider a set of conflicting electrical requirements. The control signal to the positioner is a 4 -20 mA current generated by the controller or DCS and transmitted to the positioner locatedremotely in the field. The electrical characteristics of a current loop sending a signal to thefield device are different from the apparently similar loop bringing a signal to a controller froma transmitter in the field.The positioner receives its power from the current signal. It receives its control setpoint fromthe value of the current and it must be able to communicate bi-directionally bysuperimposing signal tones upon the current signal without distorting the current signal,without the tones being affected by the electrical characteristics of the current signalingdevice. All these conflicting requirements must be met with equipment manufactured byvarious manufacturers, and work with long cables, in a noisy hostile plant environment.Energy levels are often limited for safe installation in explosive environments. Specialengineering may be required to meet the signaling requirements at low energy levels.The following will not cover all the details for a successful installation, in all cases. That isbeyond the scope of this instruction. It will suffice to explain the requirements as a guide useto obtain necessary components from many sources for a successful installation.CAUTION Do not connect a HART® modem and PC to a control circuitunless the controller is HART® compatible or has a HART® filter.Loss of control or a process upset may occur if the controlleroutput circuit is not compatible with HART® signals.Install in compliance with Hazardous Area rules in accordancewith local electrical codes and plant standards by trainedspecialists.Do not connect a PC or HART® modem (that is not approved asintrinsically safe) to an intrinsically safe circuit except on the safearea side of the barrier. Do not operate a PC in a hazardous areawithout compliance to local and plant regulations.