Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
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Compressor control and surveillance
3.3.4 SAB 128/163 Mk 2 Booster with oil pump
Once the compressor has received starting permission, the pump will start. The built-in spring ensures
that the capacity slide is in minimum position.
Start the compressor and wait for a signal from the oil flow switch for max. 50+10 seconds.
If there is no signal from the oil flow switch for 10 seconds during operation, the compressor will stop.
The oil pump runs continually during operation to ensure sufficient pressure to move the capacity slide.
Alarm surveillance
During start the following alarms are delayed:
Low oil pressure 45 sec.
High filter diff. pressure
300 sec.
Low superheat 300 sec.
High superheat 300 sec.
Low/high oil temperature
300 sec.
See also section 6.5 Timers.
3.3.5 SAB 202, SAB 163 H/128 H Mk 3 with oil pump and VMY Mk 3 with full flow
pump
The pump is used for prelubrication and for maintaining a minimum oil pressure level during operation.
The pump is started and stopped in accordance with the compressor differential pressure (discharge
pressure - suction pressure) during operation.
The difference is set in the picture Oil/Pressure/Control whereupon Set point 1 and Set point 2 appear.
Set point 1 is the pump start pressure, and Set point 2 is the pump stop pressure. Therefore, Set point 1
must be adjusted to the lowest pressure level.
Normal setting for SAB 202:
Set point 1 = 2.5 bar
Set point 2 = 4 bar
Move the cursor to Set point 1, press to enter the parameter change field, use and to adjust the
value and then press to store the value.
Adjust Set point 2 the same way.
If the compressor differential pressure is below Set point 1 during operation, the pump will start immedi-
ately. When the compressor differential pressure has been higher than Set point 2 for 60 seconds the
pump will stop.
Starting sequence
When the compressor has received starting permission, the oil pump will start. Make sure that the ca-
pacity slide is in minimum position. On SAB 202 this is generally always the case as the slide is pushed
down by a spring.
The oil is pumped into the compressor lubrication system and when the oil flow switch is activated, the
prelubrication period will begin.
When the time has expired the compressor is started and the pump will run for min. 60 seconds. The
pump stops when the differential pressure is above Set point 2 as described above.
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