GE MN-ValVue-v2-8-IOM Manuel de service télécharger pdf (Page 108)

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ValVue Digital Communications Software Ver. 2.80

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GE Oil & Gas

Position Limit Stops

Use the SVI II AP to establish software limit stops. If enabled, during correct operation of the

SVI II AP, the control functions of the SVI II AP do not allow the valve position to be lower than

the lower position limit or above the upper position limit.

NOTE This option does not provide mechanical stops for the valve. In an

electrical or air failure the valve goes to the fail safe position

without regard to the software limit stops.

The full open and full closed buttons similarly ignores the settings of the software limit stops.

Some of the diagnostic tests cannot be performed with position limit stops set.

Single/Double Acting

This is factory set.

Air-to-Open / Air-to-Close

You must select whether the valve is an air to open valve or an air to close valve. This selection

is used to determine whether an increasing signal opens or closes the valve.

Position Fault Limits

You can configure how position errors are handled. A position error occurs when the valve

position differs from the requested position (from the input signal in Normal mode or the

manual setpoint in Manual mode) by more than the Position Error Band for more than the

Position Error Time 1. When this occurs, a status flag is set which is reported during the next

HART message (only that a flag is set is reported. You must send a Read Status message to

find out the cause of the status flag). If the error persists for Position Error Time 2, the valve is

put in failsafe position. This latter action can be disabled by unchecking the enable box next to

the Time 2 entry.

For practical considerations, Time 2 (if enabled) must be larger than Time 1 by at least two

seconds. Time 1 must be at least as long as the time required to open the valve fully or

unnecessary position errors are reported. The maximum time is 327 seconds.

Language

The SVI II AP can display its menu in English or French. The ValVue program is not affected.

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GE MN-ValVue-v2-8-IOM Manuel de service Page 108

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