Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
319/346
Version no.
Description
1.0.6.0
The analogue output for control of the HLI expansion valve has been moved from ana-
logue output channel AO3 to channel AO1. It is now possible to configure both Rota-
tune (VSD) and HLI 4-20mA oil cooling.
A new function makes it possible to make the compressor capacity (Yield) signal avail-
able as an analogue output on channel AO1.
A new Rota function for reciprocating compressors with VSD has been added. With this
function all part loads are run at minimum speed.
The max discharge pressure limits for HPO compressors have been increased to make
it possible to operate up to 42 Bar as specified.
For two steps reciprocating TSMC/TCMO compressors the limiting function for
Process
out high/low
process out were not active. This has now been corrected.
SAB 120 with oil pump started the oil pump if the compressor stopped at a capacity >
5%. The oil pump should not be started and this has been corrected.
For screw compressors, the default settings have been changed for oil temperature
limits and discharge gas superheat limits.
A sequence control problem observed on plants with three Rota compressors running
under Multisab has been solved. Due to that problem the third compressor in sequence
would sometimes fail to start when it was needed. The start timer was activated but
stopped shortly after.
Capacity control through Profibus would not re-establish default Multisab sequence op-
eration when control was switched back from
Capacity control
to e.g.
Suction pressure
control
. This could be seen by the fact that the start number did not automatically
switch from 0 to the original start number. This has now been corrected.
It was not possible to change the following Danbuss parameters; M0102, M0103,
M0104 and M0105. This has been corrected.
If continuously writing values to UniSAB III via Modbus TCP from a PLC, UniSAB III
would be overloaded by saving data even though the data were not changed. It used
all available resources which could make UniSAB fail. This has now been corrected.
The HMI reaction time has been improved - the key response time is now faster.
The update of all dynamic pictures has been improved - the drawing of the pictures has
been made faster thus improving the HMI.
In some pictures, the
and
keys are now used as PgUp and PgDn functions.
They work in most pictures with a scroll bar on the right side i.e. when there are more
lines that can be displayed at a time.
F2
F3
Summary of Contents for SABROE Unisab III Control
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