Flowserve ValveSight Diagnostics - Manual (Page 22)

ValveSight Diagnostics for HART User Manual FCD VSENSF0001-02-AQ 03/15
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6.5 Control Health
This screen displays the indicator that determines the control health. And Implications and Possible Solutions button is
available. When the button is selected, information regarding that indicator will be displayed to the right. This page is only
available with the Advanced DTM used with a positioner that has been upgraded with Pro diagnostics. Otherwise use the
Configuration>Alarms/Alerts>Command Deviation screen to set limits.
Deviation Alert
The deviation is shown in the Actual Value display box. It represents the position command minus the actual valve posi-
tion. The are two settings to adjust the sensitivity of this alert. The first setting is the Tolerable Error band for the valve
assembly. The second setting is the Deviation Time Frame. These settings will help to prevent the alarm from occurring
during normal changes in command. As the deviation value becomes greater than the Tolerable Error, a timer is started.
If the deviation remains larger than the Tolerable Error for longer than the time indicated in the “Deviation Time Frame”
display box, the Control Health bar on the Dashboard will turn red and an alarm will be send in response to a HART com-
mand 48. To adjust the limits, type in the desired value, or use the page up/down buttons on your keyboard. Press the
Apply button at the bottom of the screen to activate the new limits in the positioner.
The error will clear as soon as the valve position goes inside the Tolerable Error. A deviation alert is informational only
and will not affect the operation of the positioner or control valve. The illustration at the bottom of the screen is a graphi-
cal representation showing how these factors work and when an alarm will be generated.
7 Diagnostics
This screen provides navigation to the following screens:
• Data Logger - on-line data collection tool
• Trends - on-line long term data
• Ramp Signature Test - off-line
• Step Signature Test - off-line
• HDRL - off-line
• Partial Stroke - off-line