Engineering manual - UniSAB III 1.10.8
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than the liquid slugging alarm/shutdown set point for a fixed 5-second period. Set
point 1 = alarm set point. Set point 2 = shutdown set point.
Note 24
Oil temperature settings on heat pumps should be increased to:
High shutdown: 95
High alarm: 90
Low alarm: 55
Low shutdown: 50
Note 25
For SABflex and SABCube, the differential pressure across the oil filter is calcu-
lated as follows: (see Fig. 6): Oil filter diff.pressure = Discharge pressure 2 - Oil
pressure 3 (after oil filter). The shown oil filter pressure will thus be 0.1 to max. 0.5
bar higher than the actual pressure loss across the filter due to the pressure loss
across the oil separator and the oil cooler.
Note 26
For SABflex and SABCube, the internal suction pressure is measured as the pres-
sure after the suction stop valve.
The alarm and shutdown is only active when the compressor is running and the
start-up limiter is no longer active.
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 compressor
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
For SMC, TSMC, HPC and HPX, shutdown monitoring is delayed 10 seconds after
compressor start (delay is adjustable).
Note 33
For SMC, TSMC, CMO and TCMO, when configured to the high-pressure transmit-
ter range 25/59/25/25 or 25/59/59/59, the max. setting for suction pressure high
alarm is raised to 18.0 bar.
For low pressure screw compressors, when configured to the high-pressure trans-
mitter range 25/59/25/25 or 25/59/59/59, the max. setting for suction pressure high
alarm is raised to 18.0 bar.
Note 34
For HPC, HPO and HPX when used as a heat pump, you must enable the dis-
charge temperature low alarm and low shutdown supervision to ensure proper
high discharge temperature.
Summary of Contents for SABROE Unisab III Control
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