Johnson Controls SABROE UniSAB III Engineering Manual page 195

Set-up
SAB 120-151, SAB 193-355, SAB 193 H-355 H, SAB 157 HR and SAB 273 S with frequency converter
UniSAB III will quickly increase the speed in the frequency converter up to the "forced speed" rpm value
entered here.
This ensures that the oil pressure is raised quickly at compressor start-up. The compressor will stay at
this speed as long as the main oil pressure is low. The alarm Forced speed active will be given as long
as the speed is kept forced up. The forced speed regulation will not be deactivated until the main oil
pressure (P abs - P abs x 1.5) is above the defined minimum limit of 1.0 bar. Speed is then reduced
oil suct
to motor rpm min. speed in manual operation or it is set free and controlled by the capacity regulator in
automatic operation.
11: Drive cap limit
90 to 100%
Enter the capacity slide limit where UniSAB III starts to increase the drive speed. For SAB 120-151, SAB
193-355, SAB 193 H-355 H, SAB 157 HR and SAB 273 S with frequency converter it is possible to ad-
just the capacity slide limit where UniSAB III starts to increase the drive speed above motor rpm min.
The drive capacity limit can be set between 90 and 100%.
Do not change this limit unless you encounter problems with the capacity slide, which for some reason
prevents the slide from reaching a slide capacity at 98.0% (default value).
Please note that on compressors with both capacity slide and frequency converter the Actual capacity
value shown in the UniSAB III info bar is the total capacity of the compressor for which we use the term
"yield". The relation between yield and slide capacity is as follows:
Yield [%] = Slide capacity [%] * (motor speed / motor rpm max).
12: Motor fan
Yes
No
Select Yes if UniSAB III is fitted on a screw compressor with a frequency converter and motor with elec-
trical motor cooling fan.
Select No if the motor cooling fan is shaft driven.
Note: If the software version is older than 1.1.0.5, this configuration point is not available, and Motor fan
control is automatically enabled for screw compressors with frequency converter. When the software
version 1.1.0.5 (or newer) is installed on an older software version, or after a factory reset, Motor fan
control is set as default to YES for the following compressor types:
• SABflex, SAB 157 HR, SAB 163 HR, SAB 128 HR and SAB 110 SR/LR.
Motor fan control will not be available if Full flow pump is selected. See subsection 6.4.5 Oil system, 2:
Full flow pump for more information.
Engineering manual - UniSAB III 1.10.8
001930 en 2021.06 195/346