SABROE UNISAB S-Control User manual

1
0171-761-EN
94.06
Compressor type: Shop no.:
Refrigerant: UNISAB Version no.:
Instruction manual
for
UNISAB S-Control
Computerized control system
for screw compressors

2
0171-761-EN
Preface
This instruction manual describes the
UNISAB S-Control system in detail, includ-
ing function, use, maintenance, service and
trouble shooting.
Please read this manual carefully to ensure
that you thoroughly understand the
UNISAB S-Control system, and know how
to operate it correctly. Damage which oc-
curs as a result of incorrect operation is not
covered by SABROE’s guarantee.
On top of page 1 of this instruction manual
the version number of your UNISAB is
stated.
At the end of the instruction manual (please
refer to the table of contents), any later ver-
sions are described in the List of versions
(0178-178).
Versions with a higher number than that of
your UNISAB are not relevant.
Warning
If it proves necessary to service the UNISAB S-Control system, the power supply to the compres-
sor motor must be switched off at the main switch to prevent the compressor from being started
accidentally.
The UNISAB S-Control box contains live parts which makes it absolutely necessary that you
comply with the safety regulations prescribed on site. Failure to do so may cause damage to
equipment and affect personal safety.
Even though the power supply to UNISAB S-Control is switched off, some of the terminals may
still be live.
Only authorized personnel are permitted to service the UNISAB S-Control.
Technical data
Power supply: Nominal VAC
115
230
Tolerance
+10/--15%
+10/--15%
Hz
45-65
45-65
Consumption:
Ambient temperature:
Humidity:
25 VA
0-55°C (operation)
20 - 90% relative humidity (not condensing).
The contents of this instruction manual must not be copied or communicated to a third
party without the prior consent of SABROE Refrigeration.
SABROE REFRIGERATION A/S
P.O. Box 1810, DK--8270 Højbjerg
Chr. X’s Vej 201, Århus, Denmark
Phone:
Telefax: [phone]
[phone]
Telex: 68740
PRODUCT DIVISION

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0171-761-EN
Table of contents
Preface 2..............................................................
Table of contens 3.......................................................
Description of UNISAB S-Control 5........................................
Operating the UNISAB S-Control 7.........................................
Start-up 7...........................................................
Operator panel 8......................................................
Pos. 1. Display 8......................................................
Pos. 2. Unit indicator 8.................................................
Pos. 3. LEDs for value points 8..........................................
Pos. 4. Keyboard 10....................................................
Pos. 5. LED field for output relays 10......................................
Basic operation 11.....................................................
Changing parameters 12...................................................
Alarm/warning functions 13................................................
Alarms 13............................................................
Low and high alarm limit settings 14.......................................
Factory settings for alarm limits: 15........................................
Reverting to factory settings for alarm limits 15..............................
Warning limits: 16.....................................................
Configuration 17.........................................................
Various functions 21......................................................
Feed-back from the motor starter 21.......................................
Connecting a thermistor 21..............................................
Set points no. 1/no. 2 21.................................................
Oil flow switch 21.....................................................
External start permission (normal stop) 21...................................
External start permission (instant stop) 21...................................
Oil cooling 21.........................................................
Economizer 22........................................................
Auxiliary output 22....................................................
Service and calibration 23..................................................
Calibrating pressure transducers 23........................................
Measuring the motor current 24.............................................
Timers 25..............................................................
Description 26........................................................

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0171-761-EN
Regulating and limiting functions 27.........................................
Manual operation 27....................................................
Oil Pump 28..........................................................
Automatic operation 28.................................................
Setting regulator parameters 29...........................................
Settings 30...........................................................
Limiting functions 31.....................................................
1. Low suction pressure 31..............................................
2. High discharge pressure 31............................................
3. High motor current 31................................................
Delayed restart function 32..............................................
External start 32.......................................................
Variable Volume Control (Vi) 32..........................................
MULTISAB sequential regulation of screw compressors 34.......................
Local automatics 35....................................................
Replacing parts 36........................................................
Trouble-shooting 38......................................................
Appendix 40............................................................
Setting of pressure and temperature alarm limits 40...........................
Actual warning and alarm limits 41........................................
External wiring 0171-773.................................................
MULTISAB sequential regulation 0171-759..................................
Installing a data communications cable 0171-732..............................
Coupling a PROSAB II/UNISAB Control to a central computer 0171-733..........
SABROE Protocol (ComSab) 0171-734.....................................
SABROE Protocol (PCComSab) 0171-737...................................
Tables 0171-738........................................................
Adjustment of position transmitter 0171-741..................................
Replacing EPROM (program) 0171-756.....................................
Spare parts list 0661-903.................................................
Settings for UNISAB S-Control 1661-198....................................
List of versions 0178-178.................................................
Wiring diagrams 3445-174................................................
3448-155
3119-468

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0171-761-EN
Description of UNISAB S-Control
The UNISAB S-Control system for screw
compressors, monitors and protects the
compressor, ensuring that it operates within
the predetermined operating limits.
With UNISAB S-Control, capacity can be
regulated manually or automatically by
built-in regulators. There are also various
limiting functions.
Compressors fitted with UNISAB S-Control
or PROSAB II can be inter-connected to
form an integrated system which ensures
that the refrigeration plant operates opti-
mally.
The front panel (illustrated below) makes
the UNISAB S-Control easy to operate. The
following description refers to the position
numbers used on the drawing.
Various values have been set by SABROE
so that the UNISAB S-Control is ready to
operate when it is delivered. These values
can be changed according to the actual
operating conditions.
Note:
UNISAB S-Control always remembers the
values you have set, or those set by
SABROE -- even if the power supply is cut
off.
SET
RE-
SET
Suction Pressure (SP)
Discharge Pressure
Diff.Pressure
Timer No.
Superheat
Discharge Temperature
Oil Temperature
Brine Temp. (SP)
Motor Current
Control NZ P. Band
Bar
°C
°Csat
1 2 4
3
5 a b c
Capacity Slide Position
Time SP
Suction Pressure (SP)
Discharge Pressure
Diff.Pressure
Bar
°C
°Csat
1 2 4
3
5 a b c
Economizer
HLI/BLI
Lubrication
Oil Pump
Comp. Motor
Capacity
Capacity

¯
Vi Control
UNISAB
S-CONTROL
Auxiliary

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0171-761-EN
Pos. 1 shows a four-digit display.
Pos. 2 LEDs are used to indicate the
value unit in the display and
whether the compressor is regu-
lated manually or automatical-
ly.
·Pressure is shown in Bar.
·Temperature is shown in °C.
If you require the refrigerant
pressure for saturated vapour
shown in °C, press the SET key
and the LED for °Csat will light
up.
Pos. 3 indicates, by means of LEDs,
which pressure or temperature
reading is displayed. Operating
values and alarm limits can be
displayed, depending on which
LED is lit. The following tem-
perature and pressure values can
be displayed:
Column a: Low alarm limit
Column b: Actual operating
value
Column c: High alarm limit
Pos 4 The keyboard is used to:
·select data points to be
displayed
·change displayed value
·select unit for pressures
·increase/decrease capacity
at manual operation.
Pos. 5 shows the state of the output
relays.

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0171-761-EN
Operating the UNISAB S-Control
Start-up
·UNISAB S-Control should be connected
as shown in the wiring diagram.
·Check to ensure that the UNISAB
S-Control is correctly coded for the vol-
tage available.
The coded voltage is stated on the side of
the code plug, as shown in the example be-
low:
230 V/AC
The code plug is placed beside the trans-
former as illustrated.
115
V/AC
230
V/AC
115
V/AC
315 mA/250 V/AC fuse
630 mA/110 V/AC fuse
Code
plug
The UNISAB S-Control will be ready to
operate approx. 5 seconds after power is
supplied.
Furthermore, please note the following:
·When the UNISAB S-Control is sup-
plied, alarm limits will have been coded
in by SABROE, as stated in the table in
the section entitled Factory setting of
alarm limits. Therefore, the UNISAB
S-Control is ready for operation.
·When power has been connected, the
UNISAB S-Control will be set to manu-
al operation. If the display shows
when you switch the UNISAB S-Control
on, the values shown in the chapter en-
titled Configuration must be entered.
·You can change to automatic operation
by following the instructions given in
this manual -- please refer to the section
entitled Automatic operation.
·If you wish to inter-connect several
compressors (each fitted with UNISAB
S-Control or PROSAB II) please refer to
the chapter MULTISAB -- sequential re-
gulation of screw compressors.
·If the power is connected while UNISAB
S-Control is set to automatic operation,
the display will flash for 60 seconds.
During this period communication to the
control units on the other compressors
will be established. The capacity regula-
tion will be disabled. This applies even
if only one UNISAB S-Control is instal-
led.

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0171-761-EN
When the display light stops flashing,
automatic operation will be resumed.
Operator panel
Pos. 1. Display
Numbers 0 - 9
A decimal point
indicates that the
last digit is a
1/10 decimal
-- (minus) and/
or number 1
Pos. 2. Unit indicator
LED
Bar
°C
°Csat
The LEDs indicate whether the compressor
is regulated manually or automatically and
the unit of the value displayed.
·No light in the LED beside indicates
that the UNISAB S-Control is operating
in automatic mode. A steady light indi-
cates that the UNISAB S-Control is ope-
rating in manual mode.
·A light in the LED beside Bar or °C indi-
cates that the display is either Bar or °C
respectively. UNISAB S-Control can on-
ly display Bar and °C for the relevant re-
frigerant.
·°Csat indicates that suction pressures, dis-
charge pressures and intermediate pres-
sures are shown in the corresponding
temperatures for saturated vapour. To
change from Bar to °Csat and vice versa
depress the SET key momentarily. Bar
values are displayed relative to atmo-
spheric pressure.
Pos. 3. LEDs for value points
Suction Pressure (SP)
Discharge Pressure
Diff. Pressure
Timer No.
Superheat
Discharge Temperature
Oil Temperature
Brine Temp. (SP)
Motor Current
Control NZ P. Band
Capacity Slide Position
Time SP *
*
*
The LED with a steady light indicates which
value is shown in the display. Obviously on-
ly one LED can be steady at any given time.
Except for the three lines above, which are
indicated by means of *, the three columns
in the LED field marked ,¯and func-
tion as follows:
indicates the measuring point whose cur-
rent measuring value is displayed .
¯indicates the low alarm limit of the mea-
suring point whose value is displayed
indicates the high alarm limit of the mea-
suring point whose value is displayed.

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0171-761-EN
The keyboard must be used to move the sig-
nal to another LED -- please refer to pos. 4
Keyboard.
The values should be interpreted as follows:
SUCTION PRESSURE is the pressure of
the refrigerant on the suction side of the
compressor, displayed relative to atmosphe-
ric pressure.
The LED in brackets indicates the set point
(SP).
DISCHARGE PRESSURE is the pressure
of the refrigerant at the pressure side of the
compressor, displayed relative to atmosphe-
ric pressure.
DIFF. PRESSURE is the pressure differ-
ence between the oil pressure in the flow
switch chamber and the suction pressure.
Low alarm limit indicates the values at
which an alarm occurs. High alarm limit is
for setting of the oil filter differential pres-
sure over the oil filter. The actual reading of
oil filter differential pressure is not available
on the display.
NB
The measured oil filter differential pressure
also includes the pressure drop through the
oil cooler the and pipe system. With warm
oil this drop will be approx. 0.5 bar, in addi-
tion to the pressure drop in the oil filter, and
with cold oil somewhat more.
TIMER NO./ TIME/ SP
(please refer to the chapter Timers)
0: Hour counter (hours x 10 = number of
operating hours)
1: Start/start
2: Stop/start
3: Prelubrication
4: Oil flow
5: Motor feedback
6: Suction pressure ramp function
7: Slide max.
8: Delay before start
9: Delay before stop
Digital inputs:
10: Motor feedback
11: External start permission (normal
stop)
12: External start permission (instant stop)
13: Set points no. 1/no. 2
14: Oil flow switch
15: Thermistor
SUPERHEAT is the temperature difference
between suction gas temperature before the
compressor (°C) and pressure (°Csat).
DISCHARGE TEMPERATURE is the
discharge gas temperature as the gas leaves
the compressor.
OIL TEMPERATURE is the temperature
of the oil at the oil flow switch.
BRINE TEMPERATURE can be used to
alter the capacity regulation so that this
function is controlled by the brine tempera-
ture, and not by the suction pressure.
The LED in brackets indicates the set point
(SP).
MOTOR CURRENT shows the power
consumption of the motor expressed in am-
pere. The measuring zone must be set cor-
rectly. Please refer to the chapter Measuring
the Motor Current.
CAPACITY SLIDE POSITION is the po-
sition of the capacity slide shown as a per-
centage.

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0171-761-EN
The values Control,Nz and P. Band are used
to regulate the compressor capacity, and
should be interpreted as follows:
·Control is used to change the UNISAB
S-Control from automatic to manual
operation -- or vice versa -- as described
in the section Manual operation.
·NZ stands for Neutral Zone. Please refer
to the section Automatic operation.
·P.Band is an abbreviation for Propor-
tional Band. Please refer to the section
Automatic operation.
Pos. 4. Keyboard
SET
RE-
SET
The six keys are used to select values and to
change parameters. They are also used to
acknowledge alarms when alarm limits are
exceeded.
When the system is set to manual oper-
ation, the keys are used to regulate the com-
pressor capacity.
The keys are used as follows:
are used to move from one
column to another in the LED
field (pos 3).
are used to move up or down
from one value to another in
the LED field, Pos. 3. They are
also used to change parame-
ters, as described in the chap-
ter Changing Parameters.
Press this key momentarily, to
change from Bar to °Csat.
The key is also used to enter
input so that parameters can
be changed, as described in
the chapter Changing parame-
ters.
SET
RE-
SET
is used to acknowledge alarms.
Pos. 5. LED field for output re-
lays
Economizer
Auxiliary
HLI/BLI
Lubrication
Oil Pump
Comp. Motor
Capacity
Capacity
Vi Control

¯
This field indicates the state of the output
relays.

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0171-761-EN
Basic operation
UNISAB S-Control is easy to operate, as
the following example clearly shows.
Economizer
SET
RE-
SET
Suction Pressure (SP)
Discharge Pressure
Diff.Pressure
Timer No.
Superheat
Discharge Temperature
Oil Temperature
Brine Temp. (SP)
Motor Current
Control NZ P. Band
Bar
°C
°Csat
Capacity Slide Position
Time SP
Auxiliary
HLI/BLI
Lubrication
Oil Pump
Comp. Motor
Capacity
Capacity
Vi Control

¯
UNISAB
S-CONTROL
In the above drawing, the steady light in the
middle column of the top row, indicates
that the reading applies to measured suction
pressure.
The LED for Bar is lit and the display
shows -0.1. This means that the Suction
Pressure is -0.1 Bar.
·By depressing the SET key momentarily,
the light in the top panel will move from
the Bar LED to °CSat LED. The display
will then show the temperature which
corresponds to the pressure of saturated
vapour for the refrigerant used.
·If the key is then pressed, the display
will show the alarm limit for low suction
pressure (column ¯).
·If you then press the key once and
then the key twice, the display will
show the high alarm limit for discharge
pressure (column ).

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0171-761-EN
Changing parameters
Some of the values can be changed. These
values are called parameters. All parameters
are preset by SABROE before the UNISAB
S-Control leaves the factory. If you wish to
change one or more of these parameters you
must first connect a jumper inside the
UNISAB S-Control.
Open the cover. Inside you will see two
prongs in the area marked PROGRAM.In-
terconnect these by means of the jumper, as
shown in drawing b.
PROGRAM PROGRAM
a. Jumper in dis-
connected position.
b. Jumper in
connected position.
You will now be able to change the parame-
ters in the UNISAB S-Control.
§For example, if you wish to change the
high alarm limit for oil temperature (col-
umn ) press the directional keys (pos. 4)
until the relevant LED lights up.
·Press the SET key and hold it down
for at least 1.5 seconds, or until the
digit to the far right of the display be-
gins to flash.
·Pressing the key increases the
value of the flashing digit.
·Likewise, pressing the key reduces
the value of the flashing digit.
·Then press the key to move to the
next digit. When this flashes, press
either or to set the value.
·When the parameter is coded in, de-
press the SET key momentarily to en-
ter the value into the UNISAB S-Con-
trol.
·If you want to change other parame-
ters just repeat the above procedure
from §.
Alarm limits for suction pressure and dis-
charge pressure can be changed using either
BAR or °Csat.
·If you press the SET key momentarily
after point §the display will change
from Bar to °Csat and vice versa.
·Then follow the rest of the procedure as
described.
Important:
Once you have changed the alarm limit,
please remember to set the jumper in the
disconnected position,asshowninfig.ain
the previous drawing. If you do not remem-
ber to do this you may change the alarm
limits without meaning to do so.
Make sure the jumper is firmly in place.

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0171-761-EN
Alarm/warning functions
Alarms
When an alarm limit is exceeded the com-
pressor stops. The relevant LED will flash
quickly and the alarm relay will change to
alarm position.
The cause of the excessive temperature/
pressure must be corrected and the value
brought within the warning limit before the
alarm can be cancelled. Please refer to the
section Warning limits.
The compressor can now restart in two dif-
ferent ways -- some of the alarms by auto-
matic reset and some by manual reset.
·At manual reset the compressor can only
start when the reason for stopping has
been rectified and the actual value is
once again within the warning limit and
the RE-
SET key has been pressed. Please re-
fer to the section Warning limits.
·At automatic reset the compressor can
restart when the actual value is again
within the warning limit (i.e. it is not
necessary to press the RE-
SET key).
In the following table manual reset is in-
dicated by M, and automatic reset by A.
Suction pressure
Discharge pressure
Superheat
Discharge temp.
Oil temperature
Brine temperature
Low High ¯
A
AM
MM
MM
MM
M
Set Point
Set Point
Diff. pressure MM

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0171-761-EN
Low and high alarm limit settings
The following table indicates the permitted
limit settings for low and high alarms.
(White fields).
Low alarm Low High High alarm
Limit for
setting
Factory
setting
(Add to low (Subtract from
high alarm)
Factory
setting
Limit
for setting
Bar Bar Bar Bar Bar
warningwarning
alarm)
Suction pressure
Discharge pressure
Diff. pressure
Superheat
Discharge temp.
Oil temperature
Brine temp.
-1 3,5 5°CSat -- -- 7
-1
0
0
-20
0
-45
-1
0
2
0
20
0
1Bar
0,5 Bar
1
5
5
2
1
0,5
5
5
5
--
18
1,5
80
120
60
--
25
25
120
145
105
15
°C°C°C°C°C°C
**
** If you compensate for cable length (see Configuration, Fig. 1), the compensation
value will reduce this max. value.
Note:
·The high limit - the LED in the column
for suction pressure and brine tempera-
ture are set points for regulation and not
alarm limits. Please refer to the section
entitled Automatic operation.
·If the low alarm limit for superheat is set
at 0, alarms and warnings will not be gi-
ven when the superheat reaches 0°Cand
the compressor will not stop.
A value of 0 may be relevant on an R717
pump circulation plant, where the super-
heat can in practice be 0. This can hap-
pen even if the suction gas to the com-
pressor is dry.
Important:
If possible, the superheat alarm should be
allowed to function, as it protects the com-
pressor from liquid hammer during normal
operation.
However, it doesn’t prevent liquid from flo-
wing with the suction gas to the compressor
in the event of a plant error. This will, of
course, cause liquid hammer in the com-
pressor and obviously the fault must be
found and rectified.

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0171-761-EN
Factory settings for alarm limits:
The following table indicates the alarm li-
mits which have been set by SABROE befo-
re the unit is delivered. (White fields).
Low alarm Low High High alarm
Limit for
setting
Factory
setting
(Add to low (Subtract from
high alarm)
Factory
setting
Limit
for setting
Bar Bar Bar Bar Bar
warningwarning
alarm)
Suction pressure
Discharge pressure
Diff. pressure
Superheat
Discharge temp.
Oil temperature
Brine temp.
-1 3,5 5°CSat -- -- 7
-1
0
0
-20
0
-45
-1
0
2
0
20
0
1Bar
0,5 Bar
1
5
5
2
1
0,5
5
5
5
--
18
1,5
80
120
60
--
25
25
120
145
105
15
°C°C°C°C°C°C
A table is provided at the end of this
manual, in the chapter entitled Appendix,so
that you can record the warning and alarm
limits you have set.
Note:
·At the low alarm limit, the differential
pressure alarm will be delayed 45
seconds after start-up and during opera-
tion.
·At the low alarm limit, the superheat
alarm is delayed 300 seconds after start-
up.
·At the high alarm limit, the superheat
alarm is delayed 300 seconds after start-
up.
·At the high alarm limit, the oil filter
differential pressure alarm is delayed 20
seconds.
·At the low and high limits, the oil tem-
perature alarm is delayed 300 seconds
after start-up.
UNISAB S-Control has an alarm relay
which changes position when an alarm situ-
ation occurs in the compressor. This relay
can be used to provide a remote alarm
(flashing light or warning bell). Please refer
to the wiring diagram.
Reverting to factory settings for
alarm limits
If you have coded in new limits, it is pos-
sible to revert to the alarm limits originally
set by SABROE. This is done by using the
configuration function. Please refer to the
chapter Configuration.

16
0171-761-EN
Warning limits:
UNISAB S-Control also has warning limits
which cannot be changed. However all war-
ning limits are linked to the alarm limits, so
that if you change the alarm limit the war-
ning limit will follow suit at a predeter-
mineddistancecodedinbySABROE.
When a warning limit is exceeded, the rele-
vant LED will flash slowly.
Provided normal conditions are resumed,
the flashing light will stop and nothing more
will happen.
However, if the alarm limit is reached, the
compressor will stop and the relevant LED
will flash rapidly.
The white fields in the following table state
the interval between warnings and alarms :
Low alarm Low High High alarm
Limit for
setting
Factory
setting
(Add to low (Subtract from
high alarm)
Factory
setting
Limit
for setting
Bar Bar Bar Bar Bar
warningwarning
alarm)
Suction pressure
Discharge pressure
Diff. pressure
Superheat
Discharge temp.
Oil temperature
Brine temp.
-1 3,5 5°CSat -- -- 7
-1
0
0
-20
0
-45
-- 1
0
2
0
20
0
1Bar
0,5 Bar
1
5
5
2
1
0,5
5
5
5
--
18
1,5
80
120
60
--
25
25
120
145
105
°C°C°C°C°C°C
* Low warning limit for suction pressure and brine temperature can be changed. Please
refer to points 15 and 16 in Configuration.
15*
*

17
0171-761-EN
Configuration
Open the cover and put the jumper in con-
nected position, Please refer to the chapter
entitled Changing parameters.
·Cut the power supply to the UNISAB
S-Control. Then press RE-
SET , keeping the
key depressed while you reconnect po-
wer to the UNISAB S-Control.
·The LED beside the column for suction
pressure will now be lit and the P.Band
LED will flash to indicate that the system
is in configuration mode.
In configuration mode, the LED field
(pos. 3) indicates the following:
Suct. press. reading
Disch.press. reading
Oil press. reading
Current parameter
value
Parameter
number
New parameter
value
Suct. press. calibr.
Disch.press. calibr.
Oil press. calibr.
Factory values
RESET
Compressor
number
Suct. temp.
Disch. temp.
Oil temp.
Brine temp.
Suct. temp. calibr.
Disch. temp. calibr.
Oil temp. calibr.
Brine temp. calibr.
Fields with no text are not valid in configu-
ration mode.
Description of valid fields:
·Suction pressure reading.
·Discharge pressure reading.
·Oil pressure reading.
These fields show a figure between 0 and
255 which relates to the measured pres-
sure. If the plant is open to atmospheric
pressure, the figure should be in the
range of 25-40. If not, the pressure trans-
ducer could be damaged.
·Suction pressure calibration.
·Discharge pressure calibration.
·Oil pressure calibration.
These fields are used to calibrate the cor-
responding pressure transducer. When a
field is entered, it will show the current
setting. Pressing SET momentarily will
transfer the currently measured figure
(from the middle column). Pressing SET
for 1.5 seconds opens the field for input.
Refer to the chapter Changing parame-
ters to see how to edit a field.
·Parameter number.
The fields in this column are for display-
ing and/or changing a number of diffe-
rent parameters. The parameter number
is used to indicate which parameter you
wish to display/change. The parameter
numbers should be interpreted in the fol-
lowing way:

18
0171-761-EN
1. Software version
(Cannot be changed).
2. Refrigerant.
0. Uninitialized
(Note! Do not select the shaded
fields).
1. R717
2. R22
3. Compressor type.
0. Uninitialized
1. SAB 110S
2. SAB 110L
3. SAB 128H Mk 1
4. SAB 128H Mk 2
5. SAB 163H Mk 1
6. SAB 163B Mk 1
7. SAB 163H Mk 2
8. VMYMk1,2,2.5
9. VMY 347H
10. VMY 347M
11. VMY 447H
12. VMY 447M
4. Prelubrication.
0. No
1. Yes
5. Booster operation.
0. No
1. Yes
6. Automatic Viregulation.
0. No
1. Yes
For more information, please refer
to Variable volume control.
7. HLI/BLI set point (--20°C - +150°C).
This parameter specifies the dis-
charge temperature above which the
HLI/BLI relay is energized.
If 100 is entered, the function is dis-
abled.
8. Economizer.
0. No
1. Yes
9. Economizer (--60°C-+25°C).
High limit for suction pressure. The
economizer is activated only when
the suction pressure falls below this
value (°Csat).
10. Economizer (0% - 100%).
Low limit for capacity. The econo-
mizer is activated only when the ca-
pacity exceeds this value. It is not ac-
tivated when the capacity falls 20%
below this value.
11. Swept volume.
The value must be entered in tens of
m3/h and is displayed as such.
UNISAB S-Control selects a standard
value for the compressor based on fe-
male drive. Always check that this
value is correct.

19
0171-761-EN
12. Common condenser.
All compressors are coupled to a
common condenser.
0. No
1. Yes
13. Set points/current limit no.1/no.2
The digital input set points no. 1/no.2
is used either to change between two
set points for suction pressure and
brine temperature (parameter 13 = 0),
or between two limit values for high
motor current (parameter 13 = 1).
14. Auxiliary outputs.
0. Warning
1. Cap. < limit
2. Cap. > limit.
15. Low warning limit for suction
pressure
This field indicates the interval be-
tween low alarm limit and low
warning limit for suction pressure in
°Csat (0 - 10K).
16. Low warning limit for brine temp.
This field indicates the interval be-
tween low alarm limit and low warn-
ing limit for brine temperature in °C
(0 - 10K).
·Current parameter value
This field shows the current value of the
selected parameter.
·New parameter value
The first time you use this field it will
show the current value of the selected pa-
rameter. If the parameter can be changed,
do so here. Refer to the chapter
Changing parameters for further infor-
mation.
·Suction temperature calibration
·Discharge temperature calibration
·Oil temperature calibration
·Brine temperature calibration
This field is used to calibrate the tempe-
rature measurements. Usually it is not
necessary to calibrate them. However, if
the wire connecting a transducer to
UNISAB S-Control is long, the stated
temperature will be too high, because the
resistance of the wire contributes to the
measured resistance value. The following
three methods can compensate for this:
A By using the curve in figure 1, you
can read the contribution of the cable
in °C. Enter this value as calibration
value for the measurement concerned.
B Measure the temperature where the
sensor is placed by means of a mea-
suring gauge. At the same time you
can read the temperature of the mea-
suring point concerned in the co-
lumn in the display. The difference be-
tween the two measuring values
should be entered as calibration value,
after which the two measuring values
must be identical.
C Immerse the sensor in ice water (pure
water with crushed ice, no salt!) or re-
place it by a precision resistor of 100
W(a deviation of 0.4 Wcorresponds
to 1°C).Press the SET key while one
of the LEDs in the column is lit, in
order to adjust the measurement to
0°C.