Lenovo Neptune DWC RM100 - Fig.17 - Fill Pressure & Level Flow Chart (at Initial Start)

CDU Operating & Maintenance Guide Page 23
Neptune DWC RM100 in-rack Coolant Distribution Unit
Start enabled
(RM100 on-line)
Is water level
sensor made?
Fill pressure
(PS1) ≥ a+b ?
a = fill pump ‘switch on’ threshold
pressure (default 0.8 Bar (12psi))
b = fill pump ‘switch off’ hysteresis
pressure (default 0.2 Bar (3psi)
‘Fill Pump Request’
& manual
fill pump start
N
Y
RM100 starts
Fill pump inhibited
Fill pump stops
Y
Y
N
A15 – Water
Make-Up Empty
Is water level
sensor made?
N
Y
Has fill pump
run > 1 min?
N
A30 – Check
Water Make-Up
Has fill pump
run > 5 secs?
Y
N
RM100 initial
start-up
A35 – Illegal Water
Sensor Condition
Pressure: No
Level: No
RM100 start-up
inhibited
A16 – Insufficient
Water
Pressure: No
Level: Yes
Pressure: Yes
Level: No
Unit off-line, commissioned,
with make-up fill bag connected
Fig.17 – Fill Pressure & Level Flow Chart (at initial start)