CDU Operating & Maintenance Guide Page 30
Neptune DWC RM100 in-rack Coolant Distribution Unit
The self-clearing and latching alarms are identified in Section 2.6
All alarms are automatically logged in an Alarm Log file stored on the controller microSD card, with the
time & date of generation.
2.6 Trouble Shooting (Alarms)
Alarms are events which may cause the unit to shut down and should be investigated immediately.
NOTICE! This is the full list of all Alarms, however not all will necessarily be active
depending on unit configuration, e.g. if the CDU has not been fitted & configured for a
Power Monitor, then the associated A39 – Power Meter alarm will not be active, etc.
Alarms shown with an asterisk (*) beside the code number in this table may not be active,
depending on unit configuration.
Severity Classification (Sev.): -
The above Severity Classifications are suggested only, customers may wish to assign their own ratings.
Display not illuminated. Power failure on display board or controller I/O board.
Open upper electrical panel door to check that 24v DC is available at controller I/O board. If there
are no LEDs showing on processor board then check I/O board 24v fuse FS1. If LEDs are on, check
for wiring faults between I/O board and display.
T1 Primary Temperature Sensor Fault
Reading from Primary temperature sensor T1 is outside the normal range of -5 to 74°C (23 to 165°F)
or disconnected.
Check sensor connections to the control board, check in-line connections, replace sensor.
T2a Secondary Temperature Sensor Fault
Reading from Secondary supply temperature sensor T2a is outside the normal range of 5 to 74°C (41
to 165°F) or disconnected.
Check sensor connections to the control board, check in-line connections, replace sensor.
T2b Secondary Temperature Sensor Fault
Reading from Secondary supply temperature sensor T2b is outside the normal range of 5 to 74°C (41
to 165°F) or disconnected.
Check sensor connections to the control board, check in-line connections, replace sensor.
T2c Secondary Temperature Sensor Fault
Reading from Secondary supply temperature sensor T2c is outside the normal range of 5 to 74°C (41
to 165°F) or disconnected.
Check sensor connections to the control board, check in-line connections, replace sensor.
T3 Room Temperature Sensor Fault
Reading from Room temperature sensor T3 is outside the normal range of 5 to 74°C (41 to 165°F) or
disconnected.
Check sensor connections to the control board, check in-line connections, replace sensor.
– Unit shutdown (shutdown IT immediately)
– Urgent alarm (immediate investigation required, prepare to shut down IT if required)
– Non urgent alarm (investigate within 4 working days)
– Information only (respond when required or at PPM)
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