Note 27 For SABflex and SABCube, the pressure ratio is calculated as
Discharge pressure (abs) / Suction pressure (abs).
The alarm and shutdown is always active.
Note 28 For SABflex and SABCube, the oil pressure is calculated as: (see Fig. 6)
Oil pressure = Oil pressure 3 (after filter) - Internal suction pressure 1a.
The alarm and shutdown is only active when the compressor is running and
the Start unload timer has run out.
For SABCube the alarm and shutdown might not be a constant value but a
linear curve that depends on the actual operating mode.
Note 29 For SAB 157 HR screw compressors the internal pressure inside the com-
pressor block is calculated as the Suction pressure (abs) multiplied with a
parameter as a function of the compressor's fixed volume ratio.
Shutdown monitoring is delayed 25 seconds after compressor start.
Note 30 Alarm monitoring is only active if Oil pump is configured and operated.
Alarm is delayed 600 seconds (delay is adjustable).
Note 31 Shutdown monitoring is only active if Oil pump is configured and operated.
Shutdown is delayed 900 seconds (delay is adjustable).
Note 32 Shutdown monitoring is delayed 10 seconds after compressor start (delay is
adjustable).
Alarms and shutdowns
Engineering manual - Unisab III 1.10
001930 en 2014.09
45/319
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