Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
183/346
•
UniSAB no. 1 has the same
System no
as UniSAB no. 2
•
UniSAB no. 3 has the same
System no
as UniSAB no. 4
•
System no
of UniSAB 1 and 2 differs from
System no
of UniSAB 3 and 4
In the right example each of the four compressors can be independently connected to any of the two
suction main lines. In this example is also important that
System no
is correct. However, it is particularly
important that when changing the valve settings, the
System no
of the relevant UniSAB III units is
changed accordingly as this does not happen automatically.
Start no
defines the priority of the compressors with a common
System no
. The unit with the lowest
Start no
will be the first to start. Multisab Master must be identical for all units with the same
System no
.
See section
. Multisab Master specifies whether the
Compr. no
or the
Start no
should
define which UniSAB III will be the system regulator
(System regulator)
.
System regulator
is responsible for the co-ordination of the involved units. The sensor of the
System
regulator
(e.g. suction pressure input) is used for the regulation. If
Multisab Master = #Compr
the unit
with the lowest
Compr. no
will be
System regulator
except if the UniSAB III unit in question is shut off or
otherwise unable to communicate. In this case the unit with the next
Compr. no
will take over as
System
regulator
.
If
Multisab Master = #Start
the unit with the lowest
Start no
will be
System regulator
but only as long as it
is available. If it is not available the unit with the next
Start no
will take over as
System regulator
.
A unit is not available if it is shut off, not communicating, not in
Remote
mode or in
shutdown alarm con-
dition
. An alarm condition may be caused by a sensor error resulting in a change of
System regulator
and thus of sensor.
In order for a compressor to become part of a Multisab system, the above key parameters must be set
up.
Control Mode
must be set for
Remote
. In other words, the user can include and exclude the com-
pressor from the Multisab system by changing
Control Mode
. See section
Summary of Contents for SABROE Unisab III Control
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