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Neptune DWC RM100 in-rack Coolant Distribution Unit
Code
A45
Pump 1 Low Flow
Pump 1 has not reached the differential pressure (or flow rate) setpoint and is running at 100% in the
Detail:
specified time limit (default 30 secs). Pump 1 will then stop and Pump 2 will run.
Check that unit has been set for the correct system flow rate (or DP), check for system blockages,
Action:
check speed controller for faults, check non-return valve on Pump 2 is not sticking open. Reduce flow
setting (or DP).
A46
Pump 2 low Flow
Pump 2 has not reached the differential pressure (or flow rate) setpoint and is running at 100% in the
Detail:
specified time limit (default 30 secs). Pump 2 will then stop and Pump 1 will run.
Check that unit has been set for the correct system flow rate (or DP), check for system blockages,
Action:
check speed controller for faults, check non-return valve on Pump 1 is not sticking open. Reduce flow
setting (or DP).
A47
MicroSD Card Full
Detail:
MicroSD card has reached capacity
Action:
Replace card
2.7 Temperature Sensor Graph
Temperature Sensor Resistance Graph
32
37
42
47
52
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
0
5
10
Fig.23 – Temperature Sensor Resistance Graph
The chart above may be used to check the validity of any of the temperature sensors used in the unit or
the remote room sensor.
CDU Operating & Maintenance Guide
Description
Temperature (
57
62
67
72
77
82
87
15
20
25
30
Temperature (
Page
Sev.
Self-clear
Latching
2
-
2
-
✓
2
o
F)
92
97
102 107 112 117 122 127 132 137
35
40
45
o
C)
35
Shutdown
Delay
✓
-
✓
-
-
-
50
55
60
-
-
-
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