Another Emergency Retrofit Completed

Well, the weather dried up and the next station installed without much issue.  One of the drives had something happen to it that caused a loop issue with the new PLC - would cause it to spike intermittently to a very high level, making the whole system unusable.  It took us a few hours to trace this to the drive. Attempted to repair the drive by switching parts from adjacent similar drives, but no luck.  Left this drive disconnected from the analog loops and ran drives at full speed until we could get an isolator in for this drive, which did resolve the issue.  We also discovered that the client had different expectations regarding how the constant speed pumps would alternate, and the maximum number of pumps that could run vs. what was in the specifications.  We will change to suit their needs.

The first emergency retrofit station started experiencing some problems about 6 months ago with intermittent lockups.  Since then the RTU manufacturer has replaced the CPU; this didn’t help.  Next grounding was checked for the station, this also has not helped.  The manufacturer just sent us a complete new RTU to install tomorrow.

On to the next emergency retrofit station. There was some question last week as to whether we should proceed, as changes are planned to that station.  We got the go ahead today, however, to proceed s originally planned.