Emerson Fisher 4320 Manual de instrucciones descargar pdf (Pagina 48)

Instruction Manual

D103621X012

4320 Position Monitor

April 2014

D Variable Summary

Process

Valve Position—indicates the position of the monitored equipment (e.g. valve) as a percent of travel or span.

Scaled Position— device variable that can be configured to present the normalized (%) position signal in engineering

units. Scaled Position uses the “percent of span” value (PV) as an input and produces a value based on the linear

conversion of an Upper Range Value and Lower Range Value and applies units defined with Range Units [Scaled

Position = (Upper Range Value – Lower Range Value ) * Position % + Lower Range Value].

Switch State—dictates the position of the monitored equipment (e.g. valve) as a discrete value.

Set Point— indicates the target value for the controlled variable.

Note

This menu item (Set Point) is Snap Command when the device is in snap-acting mode.

Open Position, Switch, or Set Point to view the overall process data quality of the item. Values are Good, Degraded, Bad,

or Manual/Fixed.

Accumulated Count—the number of cycles that have accumulated since the last time the counter was reset to zero.

Update Rate—indicates the effective update rate for each of the variables displayed in the Process menu.

Dwell

Closed/Low Dwell—the time elapsed since the switch state last entered the Closed/Low region (freezes when state

leaves that region).

Transition Dwell—the time elapsed since the switch state entered the Transition region (freezes when state leaves that

region).

Opened/High Dwell—the time elapsed since the switch state entered the Opened/High region (freezes when state

leaves that region).

Quality variables below Closed/Low Dwell, Transition Dwell, and Opened/High Dwell indicate the overall process data

quality of the item. Values are Good, Degraded, Bad, or Manual/Fixed.

Valve (On/Off Control)

Note

Valve variables are only available when not in snap-acting mode.

Last Close Stroke—the time needed to complete the most recent stroke from opened to closed.

Last Open Stroke—the time needed to complete the most recent stroke from closed to opened.

Quality variables below Last Close Stroke and Last Open Stroke indicate the overall process data quality of the item.

Values are Good, Degraded, Bad, or Manual/Fixed.

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Emerson Fisher 4320 Manual de instrucciones Pagina 48