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-Due to the Chillers being off for an extended period, we had to wait 24 hrs to turn them on to let the crankcase heaters operate. In order to start cryo cooling in the meantime, we turned off valves to the server rm and burned ice on the CHW loop with a setpoint of 55. We then turned on TAC with a setpoint of 65°F. This resulted in a burn rate of about 2% per hour and allowed cooling overnight. Ambient temperatures were also cold, which was likely advantageous.
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https://www.dropbox.com/s/p8wug0xrvv6wose/OCP1.6%20FMS%20HMI%20Overview.mp4?dl=0
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CH03 voltage monitor tripping on under voltage each time the last compressor fires up:
Monitor settings:
Under Voltage %:
Interrogation Time:
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Adjusted CH02/03/05 voltage monitors:
%under 5 → 7
%over 5 → 7
fault delay sec 6 → 10
Avg Volt 489 → 480
Chart before adjustments (each spike is when voltage monitors were tripping:
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Measured CH05 Circuits 1 and 2 amps with clamp meter compared to chiller readout. Chiller reading low on both by about .4 amps.