Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
181/346
Hot water
temperature is measured by a Pt 100 sensor in the water output of the condenser. Set point
is set in the picture
Control values/ Process temp./Process out temp./Control
.
Ext. cool
At this stage it is possible to connect an external 4-20 mA transducer as cooling function, i.e.
at a rising signal the compressor will load capacity. Additionally, set
Function
to
Ext.inp.signal
in picture
Setup/Configuration/External input
. The points 4 mA and 20 mA must be set as minimum (4 mA) and
maximum (20 mA) values of the sensor. Select
Control values/User/User Input 1/Control
and enter
regu-
lator set point, neutral zone
and
prop. band
. See also section
.
Ext. heat
At this stage it is possible to connect an external 4-20 mA transducer as heating function, i.e.
at a falling signal the compressor will load capacity. Additionally, set
Function
to
Ext.inp.signal
in picture
Setup/Configuration/External input
. The points 4 mA and 20 mA must be set as maximum (20 mA) and
minimum (4 mA) values of the sensor. Select
Control values/ User/User Input 1/Control
and enter
regu-
lator set point, neutral zone
and
prop. band
. See also
.
3: Capacity controller
I
PID
Select
PID
for special applications where a change in the cooling requirement must be met by a fast
change in capacity. Select
I
for normal refrigeration plants. See also section
.
4: Auto start
No
Yes
If selecting
Yes
, the compressor will start by itself in
Auto/Remote
depending on what is required. Regu-
lation is now automatic. If selecting
No
, the compressor must be started manually even though it is in
Auto/Remote
. During operation the compressor regulates automatically.
5: Auto stop
No
Yes
If selecting
Yes
, the compressor will stop automatically at minimum capacity by decreasing demand. If
selecting
No
, the compressor must be stopped manually even if
Auto
or
Remote
has been selected in
Setup/Compr. Control, Mode
.
6: Cold store
No
Yes
Choosing this function affects the way the Multisab system starts and regulates the compressors in a
common system. See detailed description in section
3.5 Compressor control - user functions
.
7: Climate compensation
No
Yes
If the compressor is used for water/brine cooling or water heating, the flow temperature can be raised or
reduced depending on the outside temperature. An extra 4-20 mA temperature transducer must be con-
nected. See detailed description in subsection
Содержание SABROE Unisab III Control
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