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Neptune DWC RM100 in-rack Coolant Distribution Unit
3.3.4 Controller checks
(setpoints and alarm actions, group control etc. – download logs)
Check the sync date and time of the units
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- Check for any current alarms, take appropriate action as detailed in this guide
- Download complete contents of RM100 folder from micro-SD card. This folder contains
historic alarm log, system log, parameter log & data log files
- Record parameters from the parameter log file that have been changed from default since
commissioning (signified by asterix(*) adjacent to parameter ID in log file) – verify with
customer why values have changed from commissioned value
3.3.5 Communication checks
Check with customer that remote communications function correctly with no reported
-
issues
3.3.6 Sensor checks
Check all fluid temperature sensors are consistent with surface temperature
-
measurement device readings. Check pressure & flow sensor readings are consistent with
other units in the group (if multiple units) and with commissioned values
3.3.7 Fluid checks
- Take secondary circuit fluid sample as directed by fluid management partner and sent to
approved lab. for analysis and report recommendations
- Take action on any previous fluid report recommendations
- Check supplementary filling operation with manual override if not automatically engaged
when taking fluid sample
- Check flexible make-up container is full and properly connected (if used)
- Record fluid filter DP readings (PS3a and PS3b difference with PS2)
- Isolate, remove and clean fluid filter(s) if necessary, and record new readings
3.3.8 Functional checks
(may require unit shutdown – check with customer before continuing)
- Check controller & display firmware status & upgrade if necessary
- Carry out audible/visual checks on operational & standby pumps
- Override operational pump speed to 100% and record temperature, current & voltage
from Status screen (ensure PS3 does not exceed high pressure alarm setpoint). Carry out
audible checks on pump
- Override redundant pump speed to 100% and record temperature, current & voltage
from Status screen, then set override back to 0%
- Check all the cable connections and terminals for signs of damage/loose wire connection
CDU Operating & Maintenance Guide
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