Note: Choose GSV/RWF L for compressors with “low volume range” (1.7 - 3.0) and GSV/RWF
H for compressors with “high volume range” (2.2 - 5.0). See compressor name plate for indi-
cation of volume range.
2: Swept volume
0 to 12000 m3/h
The compressor swept volume must be entered in plants consisting of:
• Screw compressors
• Screw and reciprocating compressors in the same system
The above is not relevant for plants consisting of reciprocating compressors without VSD only.
See the swept volume on the compressor name plate.
3: Volume ratio (screw compressors)
Manual
Auto
If selecting Auto, the compressor must be fitted with solenoid valves etc for automatic regu-
lation of Vi slide.
4: Fixed Vi ratio
1.4, 1.7, 2.2, 2.9, 3.4, 4.0
For SAB 157HR high pressure screw compressors of the HPSH type with fixed Vi ratio, select
the correct Fixed Vi ratio for this compressor block. The fixed Vi ratio is stamped on the com-
pressor block.
5:Vi comp. plug valve
No
Yes
Select Yes if you wish to use the plug valve to optimise the Vi ratio at part load in case the
compressor is operating at a lower Vi ratio than the block is designed for. This gives lower
power consumption, but might lower the maximum compressor capacity too.
Select No if you do not wish to use the plug valve to optimise the Vi ratio at part load.
6: Vi low range
Yes
No
Select Yes for types SAB 193 S - SAB 355 X with low volume range (1.7-3.0), SABflex and
SABCube compressors with low volume range. See volume range on compressor name plate.
Select No for all other compressor types.
7: Vi trig level
2.5/3.6
This setting is for SABflex and SABCube screw compressors. It defines the Vi trig level where
the Vi slide output is set to low or high. The Vi trig level depends on the setting of the Vi low
range. Not changeable.
8: Vi mode
70 to 97%
Only relevant for screw compressors with electrical slide control. See subsection 3.9.1. Electri-
cal slide control.
Set-up
Engineering manual - Unisab III 1.10
001930 en 2014.09
183/319
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