Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
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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
oil
abs - P
suct
abs x 1.5) is above the defined minimum limit of 1.0 bar. Speed is then reduced
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
Full flow pump
for more information.
Summary of Contents for SABROE Unisab III Control
Page 1: ...UniSAB III control Version 1 10 8 Engineering manual EN...
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