Emerson Fisher 4320 Manual de instrucciones descargar pdf (Pagina 56)

Instruction Manual

D103621X012

4320 Position Monitor

April 2014

Note

The 4320 wireless position monitor also includes a power module voltage warning and a critical power failure alert. These can be

viewed through the 1420 gateway web interface. Look under Monitor then Point Data and select your device from the available

HART tags.

There are two fields (true or false) that can be mapped into Modbus, OPC, or DeltaV:

TAG.BATTERY_WARNING_GETTING_LOW and

TAG.CRITICAL_POWER_FAILURE

BATTERY_WARNING_GETTING_LOW occurs at approximately 6.5 volts, at room temperature, and should be used to indicate that

maintenance should be performed or scheduled soon.

CRITICAL_POWER_FAILURE occurs at approximately 6 volts, at room temperature, and should be used to indicate that

maintenance should be performed or scheduled immediately.

For information on using Modbus or OPC with the 4320 wireless monitor refer to 4310/4320 Wireless Position Monitor OPC

System Integration Guide (D103530X012) or 4310/4320 Wireless Position Monitor Modbus System Integration Guide

(D103529X012), available from your Emerson Process Management sales office or at www.Fisher.com.

D Open or close stroke time indicates how long the on/off controller took to previously open or close the valve (not

available in snap-acting mode). Increased stroke time could suggest increased packing or bearing friction, loss of

motive-force, or trim clogging. Decreased stroke time could indicate the loss of process pressure or separated

linkage.

Refer to figure 25 and 26 for the Field Communicator menu trees.

In AMS Wireless Configurator or AMS Device Manager, go to Service Tools, Variables, then select the Valve tab to view

Last Close Stroke Time or Last Open Stroke Time and the Dwell Time in the current state, as shown in figure 31.

D Opened/high or closed/low dwell time indicates how much time has elapsed since the switch state last entered

opened/high or closed/low region. This can be used to determine when the valve last moved.

Transition Dwell provides the total elapsed time the valve was in the transition state  between limits. This was

initially implemented for safety relief valve monitoring applications to eliminate the need of calculating the

difference of timestamps sent to the control system host. This refers to the time the valve was not closed. In order

for this feature to report correctly you must first map to the Transition Dwell as a published variable. Go to

Configure, Manual Setup and click on the Wireless tab. Select View/Configure Message 0 (or whichever message is

publishing Selected Device Variable). Click on Modify, then set Transition Dwell as one of the published variables.

Click on Accept.

Refer to Dwell Tracking and Tracking Debounce under Operational Options on page 41 to enable and refine the Dwell

Tracking feature.

Refer to figure 25 and 26 for the Field Communicator menu trees.

In AMS Wireless Configurator or AMS Device Manager, go to Service Tools, Variables, select the Dwell tab and Read

Dwell Variables to view opened/high or closed/low dwell and transition dwell times, as shown in figure 32. If

communicating at the maintenance port, the Read Dwell Variables button does not appear, the Dwell Times are

directly available on the Dwell tab.

Note

The screen shot in figure 32 is for a wireless connection.

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