Table of Contents
Advertisement
Neptune DWC RM100 in-rack Coolant Distribution Unit
Code
A06
T4 Secondary Temperature Sensor Fault
Reading from Secondary return temperature sensor T4 is outside the normal range of 5 to 74°C (41 to
Detail:
165°F) or disconnected.
Action:
Check sensor connections to the control board, check in-line connections, replace sensor.
A07
T5 Primary Temperature Sensor Fault
Reading from Primary return temperature sensor T5 is outside the normal range of 5 to 74°C (41 to
Detail:
165°F) or disconnected.
Action:
Check sensor connections to the control board, check in-line connections, replace sensor.
A08*
RH Relative Humidity Sensor Fault
Reading from Room humidity sensor RH is outside the normal range of 5 to 100% RH or disconnected.
Detail:
[Note: if in Fixed Set Point + DW Offset mode, unit will revert to Fixed Set Point mode – default 18°C
(65°F)].
Action:
Check sensor connections to the control board, check in-line connections, replace sensor.
A9
PS1 Secondary Pressure Sensor Fault
Reading from Secondary return pressure sensor PS1 ('Fill' pressure) is outside the normal range of -1
Detail:
to 8 bar (-15 to 116 PSI) and min/max values only will be displayed. [Note: for DP control, if system
differential pressure is not valid, then pump speed will remain at last know demand].
Action:
Check sensor connections to the control board, check in-line connections, replace sensor.
A10
PS2 Secondary Pressure Sensor Fault
Reading from Secondary filter outlet pressure sensor PS2 is outside the normal range of -1 to 8 bar (-
Detail:
15 to 116 PSI) and min/max values only will be displayed [Note: if filter differential pressurePS1-PS2 is
not valid, then pump speed will remain at last know demand].
Action:
Check sensor connections to the control board, check in-line connections, replace sensor.
A11
PS3 Secondary Pressure Sensor Fault
Reading from Secondary supply pressure sensor PS3 is outside the normal range of -1 to 8 bar (-15 to
Detail:
116 PSI) and min/max values only will be displayed [Note: for DP control, if system differential
pressure PS3-PS1 is not valid, then pump speed will remain at last know demand].
Action:
Check sensor connections to the control board, check in-line connections, replace sensor.
A12
Secondary Flow Meter Sensor Fault
Detail:
Secondary flow meter output is below 4mA.
Action:
Check sensor connections to the control board, check in-line connections, replace sensor.
A13
Primary Flow Meter Sensor Fault
Detail:
Primary flow meter output is below 4mA.
Action:
Check sensor connections to the control board, check in-line connections, replace sensor.
A14
Micro SD Card Fault
Detail:
The SD card has either been removed or physically damaged.
Action:
Replace the SD card
A15
Leak Fault / Water Make-up Empty
Fill pump has been running for more than 1 minute (default), when level sensor is made, but
minimum system pressure level has not been achieved. Also activated when level switch remains
Detail:
open and system pressure has not been achieved (accompanied by an 'A16 - Insufficient Water Level'
alarm).
Check the make-up water container is full, tubes are free of air locks, container is properly connected
Action:
and fill pump is operational. Check system for leaks.
CDU Operating & Maintenance Guide
Description
Page
Sev.
Self-clear
Latching
✓
4
✓
4
✓
3
✓
3
✓
3
✓
2
✓
2
✓
3
✓
3
2
-
31
Shutdown
Delay
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
✓
-
-
Advertisement
Table of Contents
