Cylinder unloading Normal Total
Additional
steps
VSD
Normal
VSD
Total
None
VSD algorithm Standard A203 Extended
(A210)
A201
Step
(COP optimised)
Rexnord Rexnord Rexnord Centa Centa Rexnord
Speed
(Regulating
optimised)
(Rexnord) (Rexnord) (Rexnord) Centa Centa (Rexnord)
Table 44: Cylinder unloading
17: Unload assist
Yes
No
Select Yes for compressor types SAB 120-151 and SAB 193-355 if it is difficult to unload the
compressor from 100% (takes too much time). The function helps separating the capacity
slide and the Vi slide without too much delay.
18: Cap.dec.assist rate
(Capacity decrease assist rate)
1% to 5% (default 5%)
The unload assist will try to reduce the capacity position with the specified % or until capacity
has been reduced to 99%.
For SAB 120-151 the max. limit is 15%.
19: Volume dead band
3%-70% (default 3%)
This setting defines if the volume slide should be decreased or increased when the unload as-
sist is active.
Example: If the setting is 10% and the volume slide position is above 90% the volume slide
will be decreased. If the volume slide position is below 90% the volume slide will be in-
creased.
20: Oil filter diff.
Yes
No
Select No if the compressor is a reciprocating compressor type SMC/TSMC/HPC with a differ-
ential pressostat. With this function set to no, the oil filter differential pressure is supervised
with a differential pressostat connected to the digital input DI5.
Select Yes if the compressor is a reciprocating compressor type SMC/TSMC/HPC with a pres-
sure transmitter before the oil filter. With this function set to yes, the oil filter differential
pressure is calculated as oil pressure before filter minus oil pressure after filter.
Set-up
186/319
Engineering manual - Unisab III 1.10
001930 en 2014.09
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