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.
3.3.10 FV 19 with oil pump
The compressor FV 19 is a small frequency regulated screw compressor without the stage
regulated capacity control as featured in SV 19.
The electrical oil pump is used for prelubrication and to maintain a minimum oil pressure dur-
ing 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
will appear.
Normal setting for FV 19:
Set point 1 = 2.5 bar
Set point 2 = 4.0 bar
Adjust set points as described in subsection 3.3.5.
Starting sequence
Once the compressor has received starting permission, the oil pump will start pumping oil into
the compressor lubrication system.
The oil flow switch must be activated within 45 seconds to avoid shutdown.
When the oil flow switch is activated, an oil by-pass solenoid valve for unloading will open for
15 seconds and the electrical fan will start.
Starting signal is transmitted to the frequency converter.
The speed is increased to 1200 rpm in 10 seconds.
The pump will operate for a minimum of 60 seconds and stop if the differential pressure is
higher than Set point 2 as described above.
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.
Compressor control and surveillance
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Engineering manual - Unisab III 1.10
001930 en 2014.09
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