Johnson Controls SABROE UniSAB III Engineering Manual page 61

Alarms and shutdowns
P oil - 1.1 x
A
P suct - < lim A
P oil = Absolute oil pressure
P suct = Absolute suct. pressure
Lim A = Shutdown for low pressure
No
Reset
t33 = 0
Fig. 7: Low lubricating pressure
Note: For SAB 157 HR, the alarm delay is 120 seconds, and the shutdown delay is 180 seconds.
P oil > [1.5 x
B
P suct ] + 1.0 bar
Yes
Allow load
Reset
t36 = 0
Fig. 8: Insufficient main oil pressure during low differential pressure
Note: For SAB 120-151, SAB 193-355, SAB 193 H-355 H and SAB 273 S, the main oil pressure low limit
is 1.0 bar.
Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
t33 + 1
t33 > 25 sec
Yes
No
t33 = 120 sec fixed
Sv < 40%
No
Yes
Low lubricating pressure
ALARM
Yes
Low lubricating
pressure
t33 > 120 sec
Yes
No
t36 + 1
Sv > 50%
No
Yes
No
Force
Inhibit
unload
load
t36 > 3 min
No
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SHUTDOWN
B
Insufficient main oil
pressure shutdown
Yes
SHUTDOWN
C