Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
103/346
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
.
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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