32. Low suction pressure
During start-up and operation the shutdown for low suction pressure is delayed for the indica-
ted period of time.
33. Lubricating pressure
During start-up and operation the shutdown for lubricating pressure is delayed for the indica-
ted period of time. An alarm is issued after 25 seconds.
1. For screw compressors
2. For SAB 157HR
34. Vi-pause
The timer is used in connection with Gram GST, SAB 120→SAB 151 and SABCube compres-
sors, which have automatic step regulation of the volume ratio. Gram GST and SAB 120→151
have three steps and SABCube has two. Before switching from one Vi step to another, the ac-
tual Vi ratio for the compressor must have been present for at least the indicated time. If not,
the change of the Vi step will be cancelled.
1. For Gram GST and SAB 120→151
2. For SABflex and SABCube
35. Oil log alm (oil log shutdown)
For GSV/RWF/SAB 193→ 355 compressors with oil pump (does not apply to SAB 120 → 151).
This timer starts the oil pump before start-up and when the compressor stops if the capacity
slide is above 5%. If capacity is not below 5% before the timer runs out, a shutdown is issued
for the oil log shutdown. Note that there is a risk of overfilling the compressor with oil which
may damage it at next start-up if this timer is set too high.
If the Oil log alarm have been activated, and the oil pump now have been running for 2 times
30 seconds, the compressor must rest for 15 minutes before restart, or the compressor shaft
must be turned 10 times in the normal rotation direction.
36. Low oil flow
This timer is activated if the alarm Insufficient oil main pressure is activated and the capacity
slide is above 50%. If the timer runs out before capacity gets below 50%, a shutdown for
insufficient oil main pressure is issued. See section 2.2. Other alarms and shutdowns for more
details about this shutdown.
1. For SAB 120→355
2. For SAB 157HR
37. Oil cir.alarm (Low oil circuit pressure alarm)
For SGC compressors (SAB 120→151, SAB 157HR and SAB 193→355)
This timer starts if the difference in pressure between oil pressure and discharge pressure ex-
ceeds 1.7 bar.
During start-up and operation, the alarm Low oil circuit pressure alarm is delayed for the sta-
ted period of time.
An alarm is issued if the timer runs out. See subsection 2.2.32. Low oil circuit pressure alarm
for more details about this alarm.
38. Oil cir.shutd. (Low oil circuit pressure shutdown)
For SGC compressors (SAB 120→151, SAB 157HR and SAB 193→355)
Set-up
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Engineering manual - Unisab III 1.10
001930 en 2014.09
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