Engineering manual - UniSAB III 1.10.8
110/346
001930 en 2021.06
Compressor control and surveillance
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.
The delayed alarms are described in section
Stopping sequence
When GST compressor stops, UniSAB III will attempt to move the capacity slide below 5% position. The
solenoid valve for decreasing capacity slide position is activated for maximum 300 seconds. If the ca-
pacity slide is not below 5% within the 300 seconds a
Capacity error
shutdown will be issued.
Vi ratio regulation
UniSAB III regulates the Vi ratio in three steps according to the actual pressure ratio. Before switching
from one Vi-step to another, the actual Vi ratio for the compressor must have been present for at least
the time indicated in timer 34
Vi-pause
(60 seconds). Otherwise the change of the Vi step will be
cancelled.
Vi slide position
../Capacity/Vi slide
pos.
Dig. output 11 (V1)
Dig. output 12 (V2)
Volume ratio 2.2
0.0 %
On
On
Volume ratio 3.5
65.3 %
Off
On
Volume ratio 5.0
100.0 %
Off
Off
3.3.15
SAB 283 Mk 1, SAB 330 and SAB 355 Mk 1 with oil pump
The pump is used for prelubrication and to maintain a minimum oil pressure level during operation. The
pump is started and stopped in accordance with the compressor differential pressure (discharge pres-
sure - suction pressure) during operation.
The difference is set in the picture
Oil/Pressure/Control
whereupon
Set point 1
and
Set point 2
will
appear.
Set point 1
is the pump start pressure and
Set point 2
is the pump stop pressure. Therefore,
Set point 1
must be set to the lowest pressure level.
Normal setting for SAB 283 Mk 1/330/355 Mk 1:
Set point 1 = 2.5 bar
Set point 2 = 4.0 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
immediately.
When the compressor differential pressure has been higher than
Set point 2
for 60 sec, the pump will
stop.
Содержание SABROE Unisab III Control
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