Attached is ten days of minute trends for some channels at EndX and EndY for the HEPI Pump systems.

At EndX, the Pump is still controlled(Ch2) by the last pressure sensor on the Pump Station skid(Ch1.)  At EndY, the control was switched early Thursday to the actual differential pressure across the actuators measured in the VEA (Ch5.)  On Friday, you can see where I smoothed the Supply & Return pressures and the Max/Mins of the differential pressure and the subsequent drive to the Pump Motor.  It looks like the diurnal temperature fluctuations are increased significantly when the daily fluctuations or the daily minimum exceed some threshold.

We still have room to improve the grounds noise but I don't believe there is any reason not to switch all the Pump Stations to the differential control.