Split Range Applications; Setting Loop Addresses For Split Range Systems - GE Masoneilan SVI II ESD Installation And Maintenance Manual

Smart valve interface with sil3 emergency shutdown pst controller

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Split Range Applications

SVI II ESD is designed to operate in split range configurations supporting up to three control

valves connected to a single controller output. Minimum input current span for each SVI II ESD

is 5 mA. For each positioner the upper range value is between 8 and 20 mA and the lower

range value is between 4 and 14 mA. For example, three devices might be configured with

input current ranges of 4 - 9 mA; 9 - 14 mA, and 14 - 20 mA. Split range operation with SVI II

ESD requires special consideration of the compliance voltage. The SVI II ESD requires at least

9.0 V. Two SVI II ESD in series requires at least 18.0 V in addition to the voltage drops in wiring

and other series devices. Typical controller output current sources rarely deliver 24 V, so the

system can become voltage starved. It is possible to boost the compliance voltage of the DCS

using a series wired voltage source power supply, as shown in Figure 87 on page 185. The

total loop voltage must not exceed the rating for the controller output current source. The DCS

vendor should be contacted to validate this approach.

Setting Loop Addresses for Split Range Systems

When more than one positioner is installed in a single current loop, the HART

each device must be set to 1, 2, or 3 (or other non-zero values) to allow a HART

recognize each of the three SVI II ESD devices on the single loop. Do not use 0 for any of the

positioners. A 0 can cause HART

Both ValVue ESD software or HART

addresses. ValVue ESD must be configured to allow multidrop mode, by selecting the Set

Options function. This function is selected in the Tools menu on the Connected Devices screen

as shown in Figure 83 on page 180 or by right clicking on the Connected Devices screen as

shown in Figure 84 on page 180. The Connected Devices screen is the first screen that

appears after successful login to ValVue ESD.

The internal electronic components are isolated from ground.

NOTE

Grounding the case is unnecessary for functional purposes.

Grounding the case may be necessary to conform to local codes.

masters to stop searching for additional positioners.

Communicator 475 can be used to set non-zero

Masoneilan SVI II ESD Installation and Maintenance Manual

loop address of

master to

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Split Range Applications; Setting Loop Addresses For Split Range Systems - GE Masoneilan SVI II ESD Installation And Maintenance Manual