Emerson Fisher 4320 Manual de instrucciones descargar pdf (Pagina 41)

Instruction Manual

D103621X012

4320 Position Monitor

April 2014

Operational Options

Valve Retry Enabled  when enabled, the device will automatically attempt to drive the controlled equipment back to

the set point 3 times before tripping the Valve Drift monitor. (On/off control only)

Dwell Tracking - when enabled provides increased resolution for dwell time measurements in monitor devices by

increasing the internal position-sampling rate to about 11 samples per second when a position change is detected.

(monitoring only)

Fast sampling ends when position changes remain below 1% for the Tracking Debounce Count. Enhanced Dwell

Tracking will work best when Hardware Triggering is also enabled.

When Dwell Tracking appears as an Operational Option, an additional menu item appears below it:

Tracking Debounce Count  the number of samples during which position change must be less than 1% of span before

terminating fast sampling for the enhanced dwelltime measurement.

Note

Operational Options is not available when the device is in snap acting mode.

Device Variable Properties

Reporting Precision—accuracy of the device is 1% of the nominal span, however you may select an additional decimal

place for reporting.

Scaled Position Properties

Range Units  engineering unit displayed with the Digital Value representation, Upper Range Value, and Lower

Range Value of the Scaled Position variable.

Upper Range Value  scaled value in engineering units associated with the 100% span endpoint.

Lower Range Value  scaled value in engineering units associated with the 0% span endpoint.

Modify – set the units and range values for mapping normalized Position(%) to Scaled Position in a controlled

procedure.

Discrete Variable Properties

Switch State Properties and Set Point Properties—includes type, class, and connection information.

Note

Set Point Properties is only available for units equipped with the on/off control option.

D Limit Switch Configuration

Valve Position / Process —indicates the position of the monitored equipment (e.g. valve) as a percent of span (displayed

for reference).

Note

This menu item (Position) is Process when process reporting (monitoring or snap-acting mode only).

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Emerson Fisher 4320 Manual de instrucciones Pagina 41