Looks like a little upkeep can go a long way! Still waiting for more time on system to collect high resolution spectra for comparison but the early views look like the ASD of the Pump Pressures are lower by several factors and the remaining coherences still around after the controller changes JeffK engineered have now all gone away.
This was achieved by
1) strapping the common legs of the Pos & Neg power supply to ground. Verbose: The + side of the Neg voltage output is tied to the - side of the Pos voltage output but this was not explicitly strapped to the green ground plug. When I did this before taking the Pump System down, the swing of all pressures dropped immediately by 4x at least--See 1st attachment: 10 minutes of second trends. I have tried this at the corner station as McCarthy suggested long ago but I did not get the same clear affect there--needs more study.
2) Charging up all the Accumulator Bladders--Most of these were extremely low and needed full charging of N2.
See the second attachment, 3 hours of minute trends of the pump station pressures, remote pressures from the BSC10 and their difference and the controller Out signal, for the maintenance period play-by-play. 1) Grounded Power Supply 2) Maintenance work while pump is off: grease motor, check Accumulator pressures, Bleed laminar flow resistors. 3) System back up while retreaving full N2 Bottle 4) Pump back off while Accumulators are charged 5) Pumps back up when complete.
Note: Obvious change in all pressure signals and the reduction of the CONTROL_VOUT which drives the motor from the quieter DIFF_PRESS. I don't know if it is obvious or just wishful thinking but maybe all the signals are quieter with the appropriately changed Accumulators.
Most of the Accumulators were not within the spec of being charged to 60-90% of operating Fluid-Side pressure. One Accumulator on the Pump Station was leaking and held no charge. I was able to tighten the Schraeder Valve and it holds N2 now.
I will post comparative coherence plots in a few more hours.
