patrick.thomas@LIGO.ORG - posted 14:18, Thursday 27 April 2017 - last comment - 06:10, Friday 28 April 2017(35843)
Chiller pump at end Y in alarm?
While updating the FMCS MEDM screens for the migration to the BACNet IOC I noticed that the alarm status for chiller pump 2 at end Y (H0:FMC-EY_CY_ALARM_2) has been active (value = 2) for at least a month. Is this normal?
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This is NOT a chiller pump alarm. It is a "Chiller 2" alarm. There are two devices which are supplying chilled water for the building HVAC - The Chiller is a refrigeration machine which cools the water and there is a separate chilled water pump (CWP) which circulates the water through the chiller and up to the building.
This chiller has two cooling circuits - one has a known fault - hence the alarm.
To confuse the issue further there are two chillers and two chilled water pumps at the end station - this provides us redundancy in case of failure.
The critical alarm is the "Chilled Water Supply Temperature". This temperature is currently normal.