Datalogger Page Controls
Datalogger Tabs
Get Data From IQ
Loads the IQ Datalogger valve torque profiles and statistical data logs into the page. Progress of download can be monitored via the bar indicator located above the control. Download takes 1-2 minutes.
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Once the valve torque profiles and statistical data logs have been loaded into the page, they can be saved to file for future reference. The boxes below the control detail the file location, name and date and time retrieval from IQ.
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Previously saved valve torque profiles and statistical logs may be loaded into the page for review. The boxes below the control detail the file location, name and date and time retrieval from IQ.
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Opens the Datalog File Viewer pop up screen. Datalogger valve torque profiles and statistical data logs are presented in a text report format.
Print Prints report to Windows default printer
Copy Copies report to the clipboard
Done Closes pop up screenPrints the View Datalog Page to the windows default printer.
Back to IndexZero Datalog Data
When connected to the IQ, this control deletes all data stored in the Datalogger valve torque profile, statistical and Event logs. This control should be used with caution and only after saving data to PC file. Refer to Save.
The Datalogger logs may be zeroed after valve/actuator refurbishment or a change in process conditions (pressure, flow, temperature) when previous data may be no longer valid. It is important that the stroke constant is set/confirmed before zeroing the Datalog Data. Refer to Stroke Constant.NOTE The IQ Datalogger Event Log can only be viewed via the Monitor Page. Zeroing the Datalogger will delete the Event Log Data. It is recommended that The Event Log is saved to file before using the Zero Datalog Data Control. Refer also to Monitor Page.
Back to IndexStroke Constant
Stroke constant governs the significance the valve torque measured for the latest stroke has on the average torque measured for all strokes. Stroke constant is set only when the Datalogger is zeroed. The default setting is 127 (range being 0 - 255) which means half the latest torque value is added/subtracted to the average value. Refer to Valve Torque Profile Tab.
In general terms the lower the stroke constant number, the bigger the effect latest torque has on the average. The higher the number, the smaller the effect latest has on the average. As a guide it is recommended that for valves operated infrequently such as isolating valves, a low number should be set. For valves operating more frequently a higher number should be set. The ideal setting for stroke constant can be found by analysing data. Where, over a reasonable number of strokes for the duty, the average profile closely matches the latest profile under normal operating/process conditions, an ideal setting is found. Remember that the latest profile is that actually measured and presented for the latest stroke so any anomalies in valve torque can be seen when compared to the average.
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Valve Torque Profile Tab
Valve torque profiles may be loaded directly from the IQ Datalogger or from a previously saved file. Refer to Get Data from IQ and Save/Load controls.
After loading torque data into the page. the valve Torque Profile tab displays the valve torque profiles as measured by the IQ Datalogger. The closing valve stroke profile is the top green graph and opening valve stroke profile is the bottom, red graph.
The horizontal axis represents the % open position in stroke, the vertical axis represents the IQ output torque developed as % of rated. The dotted red line represents 100% of IQ rated torque. Refer to the actuator nameplate for rated torque value.
The graphs show the "latest" and "average" torque measured at each percent transition through stroke.
Latest The actual torque measured the last time the IQ moved through that position. Coded: Green Closing, Red Opening.
Average An average torque derived from all previous times the IQ moved through that position. Coded: Hatched.
Refer also to Stroke Constant for information on averaging.By moving the mouse over the bars in the graph the individual position, latest torque and average torque values are displayed in the boxes at the top of the tab
Notes:
The IQ Datalogger records torque values only at each % transition throughout stroke for both directions. Torque generated between transitions is not recorded or displayed in the valve torque profile log.
Operations over a part of the stroke will overlay existing torque profile data for that part of the stroke only. Existing data will be displayed for the parts of stroke over which movement did not take place.
It is recommended that the valve torque profiles are saved to file at regular intervals. This will aid future analysis. Refer to Load/Save Controls and Load/Save Reference File.
Save/Hide/Load Reference File
Save Once a valve torque profile has been loaded into the page, it can be saved as a reference file for future comparison. Reference profiles can be loaded onto a displayed profile in order to compare operational valve torque profiles over time.
Use the Save Reference File control located at the bottom of the Tab. Select Opening Torque Only, Closing Torque Only or Opening & Closing Torque profiles to save the required profile.
Note The latest torque values are used to create a reference file.
Load A previously saved reference file can be loaded into the torque profile tab for comparison with the displayed profile. The reference profile is colour coded blue and shows only latest torque value at each % transition as a blue line. Moving the mouse over the profile will result in latest, average torque and position information being displayed in the boxes at the top of the tab of the loaded profile. Reference profile data is not displayed in the boxes. If required a reference profile can be loaded without having previously loaded a valve torque profile.
Note: A reference profile file can be opened in other applications such as a spreadsheet for generating reports etc.
When loading into Microsoft Excel the following instructions apply: To open the torque reference file (extension .trf), in Excel select "File", "Open". In dialog selector, select file type "All Files" so you can see the .trf file. Select required torque reference file and click "Open". Excel will then open the Text Import Wizard. Select "Fixed Width" option, which will format the data in columns - then click "Next" and then "Finish".Hide To remove a reference profile from the screen use the Hide Reference File control.
Back to IndexStatistics Tab
The statistics tab provides basic statistical information on the operation of the IQ.
Note that the displayed statistical data is that recorded since the Datalogger was last zeroed. Refer to Zero Datalogger DataLast Close Limit Trip The last time the actuator reached the closed limit position.
Last Close Limit Reset The last time the closed limit was reset i.e. the actuator moved away from the closed limit position.
Last Open Limit Trip The last time the actuator reached the open limit position.
Last Open Limit Reset The last time the open limit was reset i.e. the actuator moved away from the open limit position.
Clockwise Contactor Operations The total number of clockwise contactor and therefore clockwise motor operations.
Anti-Clockwise Contactor Operations The total number of anti-clockwise contactor and therefore clockwise motor operations.
Note To confirm valve closing direction refer to Configuration Page, Actuator Close SetupMaximum Opening Torque The position, time and value of the highest recorded torque in the opening direction.
Note. Position = % Open; Time = DD/MM/YY, hrs:min:sec (2 decimal places); Value = % of rated TorqueMaximum Closing Torque The position, time and value of the highest recorded torque in the closing direction
Note. Position = % Open; Time = DD/MM/YY, Hrs:Min:Sec (2 decimal places); Value = % of rated Torque
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