Fig.17 - Fill Pressure & Level Flow Chart (At Initial Start) - Lenovo Neptune DWC RM100 Operation & Maintenance Manual

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