To understand this topic, its beneficial to first understand that SCADAR.NET does not actually know 'compressor status'. If you think about it, when the physical audit was performed, there's nothing actually logging compressor status! Instead, SCADAR.NET uses coded algorithms to determine compressor status. In part, those algorithms are reliant on the compressor table data's accuracy. In other words, when the compressor table data's accuracy deviates significantly from what was physically logged, inaccuracies can occur! The good news is that such inaccuracies can be corrected...
Using Graph Wizard, the first thing a user should do is check for correct compressor status (e.g. plot the compressor kW and power factor data on graph and review accuracy). Sometimes SCADAR.NET will report load and unload status incorrectly as shown in the example below (i.e. Some productive (LOADED) energy (GREEN) is being reported as non-productive (YELLOW)).
As we wrote before, the reason of inaccurate compressor status results is a consequence of physically logged data significantly deviating from the compressor table data... Voltage and/or load/unload kW and/or Power Factor entered in compressor table (Audit Wizard) deviate significantly from the measured V, kW or PF data.
Note that if compressor status is incorrect, calculated flow (supply and demand) will be incorrect as well!
To correct this inaccuracy on SCADAR.NET go back to Audit Wizard and update the Voltage and/or kW and/or PF in the relational compressor table;
Click on Audit Wizard. Double click on your audit.
Using the green progress indicator... Click on ‘Configure base station and data loggers’.
Click on the kW logger that you want to change V, load/unload kW and PF.
Click on the icon to edit your compressor table.
Go to ‘Power and Motor data’. Edit Voltage and/or load/unload kW and/or PF.
Go to Performance Data. Edit the maximum kW data. Sometimes you will have to edit minimum kW (e.g. inlet modulation compressor).
Click on the check mark . Click OK.
Lastly and again using the green progress indicator, click ‘Transfer data’. Find the 'RE-SYNC button and Click 'RE-SYNC'...
The RE-SYNC action 're-compiles' the data on SCADAR.NET (e.g. the newly edited compressor table data) with the physically logged data. As a result, the revised compressor table data is used by SCADAR.NET which should eliminate any inaccuracies in compressor status and calculated flow.
To verify, use Graph Wizard once again to check the kW and power factor graph. In the example used previously the results (shown below) are now accurate...