Application program for pCO
Standard 1/3 compressor
pack control
Manual version: 1.0 - 21/10/94
Program code:
EPSTDEFC2A
Rif.: 83
EM
Ver. 1.0 dated 21/10/94 2
pCO controller
for refrigeration
EPSTDIFC2A ver. 1.002 (normally closed inputs)
Functions performed by pCO:
- Control and regulation of a refrigeration system, max. 3 compressors
- Display of all measured values and set-points
- Possibility of selecting and successively modifying the regulation parameters
- Indication of any off-normal condition via acoustic and visual signals (BUZZER and
ALARM MESSAGES)
- USER-UNIT communication interface (KEYPAD - DISPLAY - LED INDICATORS)
- Possible connection to remote supervisor via RS422 serial line.
Manuale Firma responsabile:
Versione
1.0
Data: 2
1/10/1994
Pagg. 37
Ver. 1.0 dated 21/10/94 3
Contents
pCO.....................................................................................................................4
Main card....................................................................................................4
Terminal......................................................................................................5
Configuration of pCO..................................................................................6
User Interface.............................................................................................6
Inputs/Outputs ............................................................................................8
Optional Cards and Eprom........................................................................11
Before requesting Service.........................................................................12
The program.............................................................................................13
Software Initialization................................................................................14
Configuring pCO.......................................................................................15
Using pCO................................................................................................18
Mask Tree .........................................................................................................22
General features.......................................................................................23
MENU Masks............................................................................................23
INFO Masks..............................................................................................25
MAINTENANCE Masks ......................................................................26
I/O Masks..................................................................................................28
CLOCK Masks ...................................................................................29
SET-POINT Masks ...................................................................................30
PROG Masks............................................................................................31
PROG+MENU Masks................................................................................34
ALARM Masks..........................................................................................36
Ver. 1.0 dated 21/10/94 4
pCO
The figure below shows all the components and optional devices of pCO dedicated to the control
and regulation of refrigeration units.
Main card
The microprocessor-based main card is the
intelligent part of the system since it carries out
the regulation program. It comes complete with
terminals dedicated to the connection of the main
devices (eg. valves, compressors, fans). The
software is contained in the Eprom whereas all
parameters set by the User will be permanently
stored (also in the event of power source failure)
into the EEprom.
The main card can be connected to the Rs422
serial line so as to provide
supervisory/telemaintenance services (standard
RS422 and Carel communication protocol).
NO11
C11
NC11
VG2
VG1
Y2
Y1
B1
AVSS
B2
B3
B4
B5
B6
AVSS
AVSS
J14
J15
G
G0
ID11R
ID11
ID12R
ID12
NO10
C10
NC10
NO9
C9
NC9
NO8
C8
NO7
C7
NO6
C6
NO13
C13
RS422
B8
B7
+24
IDCM2
ID10
ID9
ID8
ID7
ID6
IDCM1
ID5
ID4
ID3
ID2
ID1
NO12
C12
NO5
C5
NO4
C4
NO3
C3
NO2
C2
NO1
C1
Ver. 1.0 dated 21/10/94 5
Terminal
The terminal unit - managed by the microprocessor - comes complete with display, keypad and led
indicators. Setting the main control parameters (set-points, differential, alarm thresholds) and
performing any other operation is extremely simple.
The terminal unit must be connected to the main card only when programming the instrument; after
that, the two units can be disconnected.
The terminal unit enables you to perform the following operations:
• initial programming via password;
• possibility of modifying run-time any working parameter;
• display of any alarm condition (via alarm messages and buzzer);
• display of all measured values.
menu I/O set prog
info
?
on-off alarm enter
Terminal unit with open front panel lid
Ver. 1.0 dated 21/10/94 6
Configuration of pCO
The figure below shows the hardware architecture of pCO.
c
d
e
f
g
i
j
h
Description of the components
1. Rubber keypad
2. LCD display, 4 x 20
3. Polycharbonate front panel and front lid
4. Connector for 24 Vac 50/60 Hz 15 VA power source or 24 Vdc 10 W
5. Telephone connector for connection to terminal unit
6. Clock card (optional)
7. Program Eprom
8. RS422 card for serial line connection to supervisory/telemaintenance systems
Ver. 1.0 dated 21/10/94 7
User Interface
Display
The Liquid Crystal Display shows the values of the controlled variables, selected set-points, alarm
thresholds and any other information concerning the status of the unit. In the event of an off-normal
condition, a special alarm message will appear on the display.
Keypad
pCO comes complete with a 15 button keypad. Keypad and display represent the User Interface.
Each button has a specific function, as listed below:
ON / OFF Operates and stops compressors and fans.
ALARM Goes to the first active alarm mask and turns off the buzzer. If pressed a
second time on the active alarm mask, it resets the alarm and returns to the
first mask again. If you press this button and there are no active alarms, the
message 'NO ACTIVE ALARM' will appear on the display. All alarm masks
can be scrolled by pressing the UP and DOWN buttons.
UP & DOWN When the cursor is on the HOME position, these buttons allow you to read all
the masks of a specific section (masks are organized in a loop structure).
When the cursor is within a numeric field, the UP & DOWN button allow you
to increase and decrease the value on which the cursor is positioned. When
the cursor is on a choice field, pressing these buttons allows you to display all
the options available (eg. Yes/No).
ENTER When the cursor is on the selection masks, press ENTER once to move the
cursor to the first introduction field. Press ENTER again to confirm the set
value and to move the cursor to the next field. When the cursor reaches the
last field, it will return to the HOME position again (cursor at position 0,0 on
the display).
MENU Press it to go to the MENU mask.
INFO Press it to go to the M_INFO1 mask.
MAINT Press it to go to the M_MAINT1 mask.
PRINT Usable only in models with printer.
I/O Press it to go to the IN_OUT1 mask.
TIME Press it to go to the CLOCK1 mask.
Ver. 1.0 dated 21/10/94 8
SET Press it to go to the M_SET1 mask.
PRG Press PROG to prompt the password. Introduce the correct password to gain
access to the M_SERVICE mask.
MENU+PROG Press and release the MENU and PROG buttons SIMULTANEOUSLY.
Then, introduce the password to gain access to the CONF_MACHINE1 mask.
Led Indicators
The keypad buttons and the green led indicators are placed side by side. Any time you press a
button, the corresponding green led will light up thus making it easier to identify which mask
section you are using.
When pressing the MENU+PROG buttons to gain access to the configuration parameters, it is the
led indicator corresponding to the PROG button that will light up.
There are other three led indicators under the following rubber buttons:
1. ON / OFF button green led indicator -
Indicates that the unit is ON.
2. ALARM button red led indicator -
Indicates an alarm condition.
3. ENTER button yellow led indicator -
Indicates correct power supply.
Ver. 1.0 dated 21/10/94 9
Inputs/Outputs
Analogue Inputs
TERMINAL N° DESCRIPTION
J2 - 7 B5 Suction pressure
J2 - 8 Common to analogue inputs
J2 - 9 B6 Delivery pressure
Digital Inputs
TERMINAL N° DESCRIPTION
J4 - 1 ID1 Klixon circuit breaker / high pressure pressurestat,
compressor no. 1
J4 - 2 ID2 Klixon circuit breaker / high pressure pressurestat,
compressor no. 2
J4 - 3 ID3 Klixon circuit breaker / high pressure pressurestat,
compressor no. 3
J4 - 4 ID4 Circuit breaker fan no. 1
J4 - 5 ID5 Circuit breaker fan no. 2
J4 - 6 IDCM1 Common to digital inputs J4 - 1 / 5
J3 - 1 ID6 Circuit breaker fan no. 3
J3 - 2 ID7 Oil differential pressurestat, compressor no. 1
J3 - 3 ID8 Oil differential pressurestat, compressor no. 2
J3 - 4 ID9 Oil differential pressurestat, compressor no. 3
J3 - 5 ID10 Coolant level
J3 - 6 IDCM2 Common to digital inputs J3 - 1 / 5
J21 - 1 ID11R Common to digital input J21 - 3
J21 - 3 ID11 General low pressure pressurestat
J21 - 5 ID12R Common to digital input J21 - 7
J21 - 7 ID12 General high pressure pressurestat
Ver. 1.0 dated 21/10/94 10
Digital Outputs
TERMINAL N° DESCRIPTION
J5 - 4 / J5 - 5 1 - NO1 / C1 Compressor no. 1
J5 - 1 / J5 - 2 2 - NO2 / C2 Compressor no. 2
J6 - 10 / J6 - 11 3 - NO3 / C3 Compressor no. 3
J6 - 7 / J6 - 8 4 - NO4 / C4 Fan no. 1
J6 - 4 / J6 - 5 5 - NO5 / C5 Fan no. 2
J24 - 7 / J24 - 8 6 - NO6 / C6 Fan no. 3
J24 - 4 / J24 - 5 7 - NO7 / C7 Unit on
J22 - 5 / J22 - 6 10 - NO10 / C10 Delayed general alarm
J22 - 1 / J22 - 2 11 - NO11 / C11 General alarm
Analogue Outputs
TERMINAL N° DESCRIPTION
J20 - 1 / 4 Y1 Fans Inverter
Relay outputs layout
c1
NO1
c2
NO2
c3
NO3
Contactor compressor 1
Contactor compressor 2
Contactor compressor 3
c4
NO4
c5
NO5
c6
NO6
Contactor fan 1
Contactor fan 2
Contactor fan 3
c7
NO7
Delayed Alarm
24 / 220 Volt
c10
NO10
Unit on
c11
NO11
Alarm
Ver. 1.0 dated 21/10/94 11
Connecting Keller pressure transducers
This application requires two pressure transducers that must be connected to terminals B5 and B6.
The first transducer will measure low pressure (suction pressure), the second transducer high
pressure (delivery pressure).
The fig. below shows how to connect the two KELLER transducers to the interface.
Series 21 / 22
- Delivery side: 0:30 bar Code SPK3000000
- Suction side: -0,5:7 bar Code SPK1000000
White
Brown
Brown =Power source
White = Signal
J2-7 / B5
J2-8 / AVSS
J2-9 / B6
Connector J2
J1-1 / B8
J1-2 / +24V
J1-3 / B7
Connector J1
White
Connect the transducers directly to the interface.
IMPORTANT:
Set the 4-20 mA configuration by placing the jumper of connectors J14 and
J15 as indicated in the figure on the left.
321
Ver. 1.0 dated 21/10/94 12
Optional Cards and Eprom
Clock Card
Clock Card
The clock card - necessary to display current time and date - must be
directly inserted into the main card through a plug-in connector. The clock
card is necessary to provide a time-zones control action. In the event of
power supply failure to pCO, the clock card will be powered by a lithium
battery for more than one month. For connection to the relative connector
(6) see page 4 above.
Code MNEWCLOCK0
RS422 Serial Card
The RS422 serial card allows pCO to be network connected into local or
remote supervisory and telemaintenance systems. For connection to the
relative connector (8) see page 4 above.
Mounting the Eprom
The Eprom - separately supplied - contains the application program.
When inserting the eprom into its socket (see page 4) pay attention to align its polarity correctly (the
notch on the eprom must coincide with that of the socket). Insert the eprom carefully without
bending or breaking its small pins.
Ver. 1.0 dated 21/10/94 13
Before requesting Service
THE UNIT DOES NOT START
Led indicator (power on) OFF, Lcd off, other led indicators off.
Cause:
a. no mains voltage
b. transformer (220 - 24V) is not powered with 24 Vac
c. 24V power supply connector is not well plugged-in
THE UNIT IS ON BUT:
the alarm led indicator is ON
the LCD shows no messages or random messages
the buzzer sounds
Cause:
a. eprom inserted with wrong polarity
b. pins of the eprom bent
c. microprocessor chip damaged: contact qualified service personnel
WRONG INPUT SIGNALS READING
Cause:
a. incorrect probe connections
b. probes' wires must be placed far from electrical noises (power
cables, contactors, high tension cables, etc.)
c. incorrect connection between interfaces and controller (flat cables)
d. incorrect power source to interfaces and probes
FAULTY EEPROM
a. contact qualified service personnel
pCO turns Off and On repeatedly (watch-dog) or it operates some (digital and/or analogue) outputs
at random.
Cause:
a. incorrect connections between interfaces and controller
b. power cables are too close to the microprocessors of the interfaces
and to the control card.
Ver. 1.0 dated 21/10/94 14
The program
General description
pCO by Carel has been specifically designed to control and regulate refrigeration units with 1 to 3
compressors as well as 1 to 3 condensation-removal fans. The activation of the compressors
depends on the value measured by the suction trnasducer and on the selected set-point; the
activation of the fans depends on the delivery pressure value.
The control of the pressure is based on a 'neutral zone regulation' that minimizes the changes of
pressure thus balancing the entire system. The system includes 12 digital inputs for the detection of
alarm signals. In case of off-normal condition, the interested device will be stopped and the
Operator will be alerted by the buzzer and by a red led indicator placed on the front panel of the
instrument.
Alarm, pressure and set-point messages are freely accessible whereas setting the working
parameters requires the introduction of a key word so as to prevent unauthorized access to the
regulation data. It is possible to display a wide range of message masks by simply acting on the
keypad (eg. clock masks and pCO identification number, necessary to enable supervisory services
within a local network). Access to the reserved masks requires a password (1234). These special
masks contain the main working parameters of the system, eg. number of compressors, number of
fans, times, alarm thresholds, etc.
The configuration masks - accessible via password only - afford you a special procedure whereby
you can initialize pCO with factory-set parameters, making the configuration of the entire system
even faster and easier.
Finally, remember that pCO can be easily connected to a SUPERVISORY COMPUTER for the
centralized control of any normal and off-normal condition of the system.
Ver. 1.0 dated 21/10/94 15
Software Initialization
Initializing the software means to set a series of important parameters such as:
- number of compressors and fans
- control parameters (set-points, times, alarm thresholds, etc.)
All set data are permanently stored and retrieved any time pCO is turned ON. The very first time
pCO is turned ON, we recommend cancelling the original data since they might be unsuitable for
your application requirements and then loading the factory-set parameters so as to make the
initialization procedure fast and easy.
Follow these indications:
- Turn pCO ON. After a few seconds the main mask - MENU MASK - appears on the display.
When starting pCO the very first time, ignore any alarms since they probably result from
incorrect data.
- Press MENU + PRG simultaneously. Now you have to digit the password, necessary to
prevent unauthorized access to the operational parameters (configuration section).
- Digit the correct password. After that the configuration masks can be accessed. Use the UP
& DOWN buttons to reach the CONF_MACHINE7 mask allowing you to delete the back-up
memory and automatically set the entire range of factory-set values.
If some standard values do not suit your application requirements, just change them by entering the
dedicated selection mask/s.
- ¹ MANUFACTURER password: "1234" . We recommend keeping the password secret so as
to prevent unauthorised access to the operational parameters. The Manufacturer password
can be used when performing preliminary operations as well as any time you do not manage
to gain access to the configuration mask by the SERVICE password in the
CONF_MACHINE6 mask.
Ver. 1.0 dated 21/10/94 16
Configuring pCO
Number of compressors
You can select the number of compressors to be controlled directly through the mask
CONF_MACHINE1. pCO manages 1 to 3 compressors having the same capacity as well as their
shifts.
Number of fans
You can select the number of fans to be controlled directly through the mask CONF_MACHINE2.
pCO manages 1 to 3 fans and their shifts.
Optional devices
You can enhance the functions of the pCO controller by adding a series of optional devices (clock
card, RS422 serial card) that can be enabled by simply acting on the dedicated masks.
In order to enable the clock card it is necessary to set time and date in the dedicated mask. When
pCO is network-connected into a supervisory/telemaintenance system by means of the RS422 serial
card, it is necessary to give each pCO a specific identification number so as to address messages
correctly.
When giving each pCO its identification number,
- do NOT give different pCOs the same address (each pCO must have its own identification
number);
- the addresses of the pCOs belonging to the same serial line must be consecutive, starting
from no. 1.
Supervisor
The table below lists the variables pCO tramsits to the supervisory computer when networkconnected into a centralized system.
MEANING TYPE IN/OUT
Status of compressor no. 1/3 Digital On dispaly
Status of fan no. 1/3 Digital On dispaly
Status of the system Digital selectable
Klixon 1/3 circuit breaker (alarm) Digital On dispaly
Alarm: oil differential pressurestat 1/3 Digital On dispaly
Alarm: general high pressure (pressurestat) Digital On dispaly
Alarm: general low pressure (pressurestat) Digital On dispaly
Coolant level alarm Digital On dispaly
Alarm: circuit breaker fan no. 1/3 Digital On dispaly
Alarm: exceeded hours threshold of compressor no. 1/3 Digital On dispaly
Alarm: high delivery pressure Digital On dispaly
Ver. 1.0 dated 21/10/94 17
Alarm: high suction pressure Digital On dispaly
Alarm: suction probe broken or disconnected Digital On dispaly
Alarm: delivery probe broken or disconnected Digital On dispaly
Alarm: clock card broken or disconnected Digital On dispaly
Alarm: eeprom damaged Digital On dispaly
Alarm: low suction pressure Digital On dispaly
General alarm Digital On dispaly
Buzzer off / alarm reset (like ALARM button) Digital Selectable
Call supervisor Digital Selectable
Suction pressure Analogue On display
Delivery pressure Analogue On display
Compressors set-point Analogue selectable
Compressors differential Analogue selectable
Alarm threshold: low suction pressure Analogue selectable
Alarm threshold: high suction pressure Analogue selectable
Alarm threshold: high delivery pressure Analogue selectable
Fans set-point Analogue selectable
Fans differential Analogue selectable
ON routine of the compressors Analogue On display
OFF routine of the compressors Analogue On display
Number of compressors Integer Selectable
Number of fans Integre Selectable
Setting the hour Integer Selectable
Setting minutes Integer Selectable
Current hour Integer On display
Current minutes Integer On display
Time to call the supervisor (set the hour) Integer Selectable
Time to call the supervisor (set the minutes) Integer Selectable
Compressors hours threshold Integer On display
Working hours of compressor no. 1/3 Integer On display
Ver. 1.0 dated 21/10/94 18
Using pCO
Status of the system
The system can be ON, OFF or in the MANUAL functioning mode.
- It is possible to turn ON the refrigeration unit by pressing the ON button on the keypad or in case of network connection to a centralized computer - by means of the external command
operated by the supervisor. When the system is ON, compressors and fans will will be
operated on the basis of the values measured by the pressure transducers.
- To turn the system off, press the OFF button on the keypad (this function must be enabled
through the CONF_MACHINE4 mask) or send the 'off' command from the supervisor. In
the event of low pressure alarm (broken probe), the system will automatically turn off. This
function, however, must be previously enabled through the CONF_MACHINE4 mask.
When the system is Off, all connected devices will turn Off.
- To activate the manual procedure, act on the masks M_MAINT6 and M_MAINT7
(protected by password). The manual procedure forces the unit into the Off status so that it
will be possible to operate all connected devices manually, with the exception of the
pressure control action and all alarm conditions that will be always automatically detected.
Compressors
The regulation action is based on a 'neutral zone control': when the pressure value goes below the
set-point the compressors will be stopped, when the pressure exceeds the value given to set-point +
differential, the compressors will be activated. Set differential and set-point in the dedicated mask.
stop
compressors
start
compressors
PRESSION
SUCTIONSET
POINT
DIFFERENTIAL
When the pressure value ranges between the set-point and the set-point + differential zone, the
system will be under stable conditions (neutral zone) and there won't be any requests for
compressors ON/OFF.
Ver. 1.0 dated 21/10/94 19
Compressors shift
Selecting the compressors shift ensures longer life to the compressors. This procedure, in fact,
makes them work in a very balanced way and compensates the number of their on/off routines as
well as their working hours.
The shift is based on a F.I.F.O. logic: the first compressor that turns On will be the first to turn Off.
At the very beginning this logic might cause an unbalanced compressors management but the
system will gradually settle.
Upon a call for compressor ON, the logic will be as follows:
- the compressor that has been Off for the longest time-interval will be the first to start;
- the first compressor that turns On will be the first to turn Off;
- any compressor will turn On again only after all the other compressors have turned On.
Compressors timer
pCO also controls the working hours of the compressors. Set the required value (default 10,000
hours) in the dedicated mask. When the compressors reach the set threshold an alarm message
prompting maintenance will be displayed.
Fans
Fans are managed on the basis of a 'steps control action'. After having selected set-point and
differential, a series of steps will automatically be created within the working zone. The number of
steps depends on the number of fans. The dedicated masks will show the On routines of each single
fan. The steps relative to the unused fans will be calculated beyond the working zone, so the fans
will never be activated. Fans will start according to the values measured by the high pressure
transducer (delivery side of the compressors). Fans shift is also available.
Inverter
The analogue output Y1 (0 - 10 Volt) is used to control an inverter; in this way the fans will be
managed according to the values measured by the high pressure probe. The purpose of this function
is to keep the condensation pressure as close as possible to the set-point by modulating the speed of
the fans. As a result, the fans will work less and with less noise, especially when the external
temperature is low.
Ver. 1.0 dated 21/10/94 20
set
differential
f1
f2
f3
Discharge pressure
0 Volt
10 Volt
Analogue output for
driving fan inverter
condenser fan
FANS INVERTER DIAGRAM
(Uscita analogica inverter inverter analogue output
per ventilatori = for fans
Pressione mandata = delivery pressure
Ventilatori condensazione = condensation-removal fans
Differenziale = differential)
Times
Most of pCO's control actions will be operated on the basis of programmable time-delays (eg. timedelay before the activation of compressors or of certain alarms so as to ensure longer life to the
compressors themselves and a well-balanced system management). pCO allows you to set the
following time-intervals:
- time-delay between two consecutive requests for compressor ON
- time-delay between two consecutive requests for compressor OFF
- minimum ON routine of the compressor
- minimum OFF routine of the compressor
- time-delay between two consecutive ON routines of the same compressor
- time-delay between two consecutive requests for fan ON
- time-delay before activating the coolant level alarm
- time-delay before activating the oil differential pressurestat alarm
- 60 seconds' time-delay before activating probe alarms (damaged or disconnected probes)
- 120 seconds' time-delay before activating the high suction pressure alarm.
Ver. 1.0 dated 21/10/94 21
COMPRESSOR1
COMPRESSOR1
COMPRESSOR1
Minimum running time
on
off
Minimum "off" time
on
off
on
off
Interval between two successive starts of same compressor
on
off
on
off
on
off
off
on
on
off
off
on
COMPRESSOR1
COMPRESSOR2
COMPRESSOR1
COMPRESSOR2
Interval between starts of different compressors
Interval between stops of different compressor
Time-zones
The time-zone control action proves to be an extremely useful option allowing pCO to work with a
lower set-point during certain periods of the day and above all during the night, so as to avoid
wasting energy. pCO has programmable time-zones. All you have to do is just set them (hour and
minutes) and their relative set-points. The table below shows the working logic of a time-zone
control action.
Eg:
HOUR/MINUTE SETPOINT EFFECT
06:00 0,9 bar
from 06:00 to 07:00 set-point = 0,9 bar
07:00 1 bar
from 07:00 to 10:00 set-point = 1 bar
10:00 1,1 bar
from 10:00 to 17:00 set-point = 1,1 bar
17:00 0,8 bar
from 17:00 to 6:00 set-point = 0,8 bar
TIME
S
E
T
P
O
I
N
T
0
0,2
0,4
0,6
0,8
1
1,2
6.00 7.00 10.00 17.00
0,9
1
1,1
19.12
6.00
7.00
10.00
17.00
In order to set time-zones, it is necessary to provide pCO with a clock card. It is possible to program
up to 4 time-zones. Should you need less than 4, it is necessary to give the unused time-zones the
same values.
The table below shows RIGHT and WRONG settings when using only TWO time-zones.
Ver. 1.0 dated 21/10/94 22
WRONG RIGHT
HOUR/MINUTES SETPOINT ORE/MINUTI SETPOINT
07:30 1 bar 07:30 1 bar
18:00 0,8 bar 18:00 0,8 bar
00:00 0 18:00 0,8 bar
00:00 0 18:00 0,8 bar
All time-zones can be programmed according to your application requirements; if you do not select
any time-zone and relative set-point, the reference set-point will be that set through the M_SET1
mask.
Default values
Default values can be automatically loaded through the 'DEFAULT' mask. The table below
indicates a list of default parameters (1st column), the mask where you can set/modify their value
(2nd column) and the default value given to each specific parameter (3rd column).
PARAMETER MASk VALUE
Number of compressors CONF_MACCHINA1 3
Compressors shift enabled CONF_MACCHINA1 yes
Number of fans CONF_MACCHINA2 3
Fans shift enabled CONF_MACCHINA2 yes
High pressure probe min. limit CONF_MACCHINA3 0 bar
High pressure probe max. limit CONF_MACCHINA3 30 bar
Low pressure probe min. limit CONF_MACCHINA3 -0,5 bar
Low pressure probe max. limit CONF_MACCHINA3 7 bar
Button OFF enabled CONF_MACCHINA4 yes
Unit turns OFF in the event of low pressure probe failure CONF_MACCHINA4 No
Autostart CONF_MACCHINA5 yes
High pressure threshold (delivery side) M_SERVIZIO 20 bar
High pressure threshold (suction side) M_SERVIZIO 3 bar
Low pressure threshold (suction side) M_SERVIZIO1 0 bar
Oil differential alarm delay M_SERVIZIO2 120 s
Coolant level alarm delay M_SERVIZIO2 90 s
Relay energization delay (alarm no. 16) M_SERVIZIO3 600 s
Time-delay between consecutive requests for compressors ON M_SERVIZIO4 20 s
Time-delay between consecutive requests for compressors OFF M_SERVIZIO4 10 s
Compressors' min. ON routine M_SERVIZIO5 60 s
Compressors' min. OFF routine M_SERVIZIO5 180 s
Min. time-interval between 2 consecutive ON routines of the same
compressor
M_SERVIZIO6 360 sec
Time-delay between ON routines of different fans M_SERVIZIO7 2 sec
Compressors set-point M_SET1 1 bar
Compressors differential M_SET1 0,5 bar
Fans set-point M_SET2 15,5 bar
Fans differential M_SET2 1,5 bar
Compressors max. threshold M_MANUT3 10.000 hour
Ver. 1.0 dated 21/10/94 23
Mask Tree
General features
+--------------------+
¦x RAW0 AL¦
¦HOME RAW1 ¦
¦ RAW2 ¦
| RAW3 ¦
+--------------------+
In the event of off-normal conditions, the 'AL' message flashes on the right-hand corner of the
display. The left-hand corner of the display represents the 'HOME' position.
+--------------------+
¦ ¦
¦ - WAIT - ¦
¦ DATA READING ¦
| ¦
+--------------------+
This mask appears when you turn On the system. After about 5 seconds the main mask MENU_MASK - will be displayed.
You can display pCO's masks by pressing the dedicated buttons on its front panel keypad (See
'Keypad' above).
Ver. 1.0 dated 21/10/94 24
MENU Masks
MENU_MASK
+--------------------+
¦00/00/0000 00:00 AL¦
¦In Pres. 00.0 bar¦
¦Out Pres. 00.0 bar¦
¦UNIT OFF *¦
+--------------------+
This mask shows the values measured by the transducers. The second row indicates the low
pressure value relative to the suction side of the compressor, the third row indicates the high
pressure value (relative to the delivery side of the compressor).
MENU_MASK1
+--------------------+
¦Neutral zone AL¦
¦Compressors ¦
¦Insertions 00.0 bar¦
¦Stop 00.0 bar¦
+--------------------+
This mask indicates the limit values of the neutral zone: the first row indicates the suction pressure
value above which there is a request for compressor ON, the third row shows the suction pressure
value under which one of the compressor will be forced to stop.
MENU2_MASK
+--------------------+
¦ On Of AL¦
¦Step 1 00.0 00.0 ¦
¦Step 2 00.0 00.0 ¦
¦Step 3 00.0 00.0 ¦
+--------------------+
This mask shows the values which determine the ON and OFF routines of the fans' steps.
Ver. 1.0 dated 21/10/94 25
INFO Masks
M_INFO1
+--------------------+
¦00/00/0000 00:00 AL¦
¦ C.AR.EL. ¦
¦ REFRIGERATION UNIT ¦
¦ CONTROL BT ¦
+--------------------+
The first row of this mask shows date (day/month/year) and time (hour/minute) and - in case of offnormal condition - an alarm message. This mask can be customized, depending on the type of
refrigeration unit pCO will control. To change LT (Low Temperature) into HT (High Temperature)
just press the ENTER button and then act on the UP or DOWN keys.
M_INFO2
+--------------------+
¦CAREL STANDARD AL¦
¦COD. EPSTDEFC2A ¦
¦Ver. 1.012 - ZAG ¦
¦June 06 1994 ¦
+--------------------+
The mask above shows the code of the eprom, as well as the program's version and date.
M_INFO3
+--------------------+
¦Test AL¦
¦date: 00/00/00 ¦
¦Refrigerant = R12 ¦
¦ ¦
+--------------------+
This mask allows you to set the time of the general test as well as the type of refrigerant the system
requires.
Ver. 1.0 dated 21/10/94 26
MAINTENANCE Masks
M_MAINT1
+--------------------+
¦Work hours AL¦
¦Compressor 1 00000¦
¦Compressor 2 00000¦
¦Compressor 3 00000¦
+--------------------+
The 'Maint1' mask displays the working hours of each single compressor.
M_MAINT2
+--------------------+
¦Insert ¦
¦Password: 0000 ¦
¦WRONG PASSWORD ¦
¦ ¦
+--------------------+
Some maintenance masks can only be accessed by a password. Digit it correctly to enter the
dedicated section (MANUFACTURER password: '123').
M_MAINT3
+--------------------+
¦Maintenance alarm AL¦
¦maximun work hours ¦
¦for compressor. ¦
¦(Nr.of hours): 00000¦
+--------------------+
The 'Maint3_M' mask allows you to set the max. threshold (hours) for each single compressor.
When the compressor exceeds the set threshold, the maintenance alarm will alert operating
personnel that maintenance is required.
M_MAINT4
+--------------------+
¦Reset hours: AL¦
¦Compressor 1: N ¦
¦Compressor 2: N ¦
¦Compressor 3: N ¦
+--------------------+
The 'Maint4' mask allows you to zero down the working hours of each compressor.
M_MAINT5
+--------------------+
¦Adjust probes: AL¦
¦Inlet 00.0¦
¦Outlet 00.0¦
¦ ¦
+--------------------+
The 'Maint5' mask allows you to calibrate the connected pressure probes. It is possible to set either
positive or negative values that will be respectively added to or subtracted from the pCO's input
value.
M_MAINT6 M_MAINT7
Ver. 1.0 dated 21/10/94 27
+--------------------+ +--------------------+
¦Manual procedure AL¦ ¦Manual procedure AL¦
¦Comp. 1: AUTOMATIC ¦ ¦Vent. 1: AUTOMATIC ¦
¦Comp. 2: AUTOMATIC ¦ ¦Vent. 2: AUTOMATIC ¦
¦Comp. 3: AUTOMATIC ¦ ¦Vent. 3: AUTOMATIC ¦
+--------------------+ +--------------------+
Should your system require maintenance, you can use the manual function to check the status of
each single device connected to pCO (compressors and fans). In this way you can directly operate
any device ignoring their previously set time-delays . In the event of off-normal conditions during
the manual stage, the relative alarms will be automatically displayed.
Ver. 1.0 dated 21/10/94 28
I/O Masks
IN_OUT1
+--------------------+
¦Digital inputs AL¦
¦1-12 Open Close ¦
¦01: CCCCC 6: CCCCC ¦
¦11: CC ¦
+--------------------+
The 'IN_OUT1' mask displays the status of the digital inputs numbered 1 - 12. 'C' stands for closed,
'O' stands for open input.
IN_OUT2
+--------------------+
¦Analog inputs AL¦
¦05: 00000 ¦
¦06: 00000 ¦
¦ ¦
+--------------------+
This mask displays the status of current inputs no. 5 and 6.
IN_OUT3
+--------------------+
¦digital outputs AL¦
¦1-11 Open Close ¦
¦01: OOOOO 6: OO--O ¦
¦11: O ¦
+--------------------+
The 'IN_OUT3' mask displays the status of the digital outputs numbered 1-11. 'C' stands for closed,
'O' stands for open input.
IN_OUT4
+--------------------+
¦Analog output AL¦
¦01: 00000 ¦
¦ ¦
¦ ¦
+--------------------+
This mask displays the status of the inverter analogue output.
Ver. 1.0 dated 21/10/94 29
CLOCK Masks
OROLOGIO1
+--------------------+
¦Clock is present? AL¦
¦Hour 00:00 ¦
¦Date 00/00/0000 ¦
¦ dd/mm/yyyy ¦
+--------------------+
If your unit has been equipped with clock card, enable it by digiting 'Yes' in the first row. If the
clock card has been enabled but it is not properly connected, an alarm message will be displayed (no
clock or damaged clock). Set the time in the second row (hour and minutes) and the current date in
the third one.
OROLOGIO2
+--------------------+
¦Daily time-zone AL¦
¦with set variation ¦
¦enabled: N ¦
¦ ¦
+--------------------+
This mask allows you to select a daily time-zones control with set-point variation.
OROLOGIO3
+--------------------+
¦1 00:00h Set = 0 AL¦
¦2 00:00h Set = 00.0¦
¦3 00:00h Set = 00.0¦
¦4 00:00h Set = 00.0¦
+--------------------+
When the time-zones control action has been enabled, use this mask to set the times of the 4 timezones. If one or more time-zones remain unused, give it/them the same value as the previous one.
See also 'Time-Zones' above in this manual.
Ver. 1.0 dated 21/10/94 30
SET-POINT Masks
M_SET1
+--------------------+
¦Compressors AL¦
¦Set point 00.0 bar¦
¦Differ. 00.0 bar¦
¦ ¦
+--------------------+
The M_SET1 mask allows you to set the compressors set-point and differential. The set-point
determines the OFF routine of the compressors whilst the 'set-point + differential' value determines
the ON routine of the compressors.
M_SET2
+--------------------+
¦Fans AL¦
¦Set point 00.0 bar¦
¦Differ. 00.0 bar¦
¦ ¦
+--------------------+
The M_SET2 mask allows you to set the fans set-point and differential. The values of the fans' steps
will be calculated within the set-point and set-point + differential ranges and will also depend on the
number of fans.
M_SET3
+--------------------+
¦Inverter AL¦
¦Set point 00.0 bar¦
¦Differ. 00.0 bar¦
¦ ¦
+--------------------+
The M_SET3 mask allows you to set the inverter set-point and differential. When delivery pressure
= set point, then inverter output = 0 Volt (max. 10 Vol t when the pressure equals or ex ceeds setpoint + differential).
Ver. 1.0 dated 21/10/94 31
PROG Masks
PASSWORD
+--------------------+
¦Insert the password ¦
¦ 0000¦
¦ ¦
¦ ¦
+--------------------+
All programming masks can only be accessed by a password (MANUFACTURER password, that is
'1234' or SERVICE password, selected via the CONF_MACHINE6 mask). If pCO does not accept
the Service password, use the Manufacturer password to gain access to the CONF_MACHINE6
mask, then select again the Service password.
M_SERVIZIO
+--------------------+
¦High threshold AL¦
¦Inlet 00.0 bar¦
¦Outlet 00.0 bar¦
¦ ¦
+--------------------+
This mask allows you to set the max. suction and delivery pressure values. When pressure exceeds
the selected thresholds, the relative alarm will be displayed and the buzzer will sound.
M_SERVIZIO1
+--------------------+
¦Low threshold AL¦
¦Inlet 00.0 bar¦
¦ ¦
¦ ¦
+--------------------+
This mask allows you to set the min. suction pressure threshold. When suction pressure goes below
the selected threshold, the relative alarm will be displayed and the buzzer will sound.
M_SERVIZIO2
+--------------------+
¦Alarm action AL¦
¦delayed: ¦
¦Oil Differ. 000 sec¦
¦Liquid level 000 sec¦
+--------------------+
This mask allows you: to set the time-delay before the activation of the oil differential alarm
following the compressor's action;
- to set the time-delay before the activation of the coolant level alarm.
Ver. 1.0 dated 21/10/94 32
M_SERVIZIO3
+--------------------+
¦Alarm relay AL¦
¦delayed for 000 sec¦
¦ ¦
¦ ¦
+--------------------+
Digital output no. 10 can be used to signal any alarm condition. The Operator will be informed of
the off-normal condition after the time-delay selected in this mask.
M_SERVIZIO4
+--------------------+
¦Compressors AL¦
¦Time among two req.:¦
¦Start 0000 sec¦
¦Stop 0000 sec¦
+--------------------+
This mask allows you to set the time-interval between two consecutive requests for compressors
ON/OFF.
M_SERVIZIO5
+--------------------+
¦Compressor AL¦
¦Minimum time of: ¦
¦Start 0000 sec¦
¦Stop 0000 sec¦
+--------------------+
This mask allows you to set the minimum time-interval relative to each ON and OFF routine of the
same compressor.
M_SERVIZIO6
+--------------------+
¦Compressor AL¦
¦Time among following¦
¦starts of the same ¦
¦compressor. 000 sec¦
+--------------------+
This mask allows you to set the time-interval relative to consecutive ON routines of the same
compressor.
M_SERVIZIO7
+--------------------+
¦Fans AL¦
¦Time among following¦
¦starts 000 sec¦
¦ ¦
+--------------------+
This mask allows you to set the time-interval between two consecutive requests for fans ON.
M_SERVIZIO8
+--------------------+
¦Supervisor call: AL¦
¦Enabled: N ¦
¦Hour 00:00¦
¦ ¦
+--------------------+
Ver. 1.0 dated 21/10/94 33
In this mask you can set the time when pCO will call the supervisory pc, even though there are no
alarms.
Ver. 1.0 dated 21/10/94 34
PROG+MENU Masks
CONF_MACCHINA1
+--------------------+
¦Compressors AL¦
¦N. comp. enabled 0¦
¦Automatic rotat. N ¦
¦ ¦
+--------------------+
This mask allows you to: set the number of compressors per circuit; set the number of capacitycontrolled routines for each compressor; enable the automatic compressors shift.
CONF_MACCHINA2
+--------------------+
¦Fans AL¦
¦N. fans. enabled 0¦
¦Automatic rotat. N ¦
¦ ¦
+--------------------+
This mask allows you to set the number of fans to be controlled as well as the automatic fans shift.
CONF_MACCHINA3
+--------------------+
¦Out.press. end sc AL¦
¦Min: 00.0 Max: 00.0 ¦
¦In. press. end scale¦
¦Min: 00.0 Max: 00.0 ¦
+--------------------+
This mask allows you to set the operative parameters of delivery and suction pressure transducers.
CONF_MACCHINA4
+--------------------+
¦Unit off AL¦
¦for maintenance: ¦
¦Key OFF Y ¦
¦Faulty probe N ¦
+--------------------+
This mask allows you to select the mode for turning off the unit: by pressing the OFF button or in
the event of damaged/broken probe.
CONF_MACCHINA5
+--------------------+
¦Identification Nr AL¦
¦pCO for supervisor ¦
¦network: 000¦
¦Automatic start N ¦
+--------------------+
This mask allows you to set pCO's identification number (only when pCO is network-connected
into a supervisory system). The last row allows you to set the type of starting mode in case of power
failure: automatic or manual.
CONF_MACCHINA6
+--------------------+
¦New Password: AL¦
¦ ¦
Ver. 1.0 dated 21/10/94 35
¦ 0000 ¦
¦ ¦
+--------------------+
This mask allows you to set a second SERVICE password to be used instead of the
MANUFACTURER password.
CONF_MACCHINA7
+--------------------+
¦Insertion AL¦
¦default values ¦
¦Press UP/DOWN keys ¦
¦N ¦
+--------------------+
This mask allows you to automatically set factory-set parameters so as to make the installation
procedure very fast and easy. Each parameter has been given a specific value on the basis of the
most common applications requirements in this field but - should it be inadequate - modify it by
simply entering the dedicated mask.
Ver. 1.0 dated 21/10/94 36
ALARM Masks
Important: use the UP/DOWN buttons to read all the masks relative to active alarms or alarms that
still have to be reset. (See 'Keyboard' above).
NOAL
+--------------------+
¦ ¦
¦ No active ¦
¦ alarm ¦
¦ ¦
+--------------------+
This mask indicates that there are no active alarms.
AL1/AL3
+--------------------+
¦ ¦
¦Overload Klixon / ¦
¦pressure X high ¦
¦ ¦
+--------------------+
These alarm masks indicate either a klixon circuit breaker or the intervention of the high pressure
pressurestat. As a consequence, the relative compressor will be stopped.
AL4/AL6
+--------------------+
¦ ¦
¦Overload ¦
¦Fan x ¦
¦ ¦
+--------------------+
In the event of fan circuit breaker, the relative fan will be stopped.
AL7/AL9
+--------------------+
¦Pressostat ¦
¦oil differential x ¦
¦or Demand Cooling ¦
¦ ¦
+--------------------+
Intervention of the oil differential pressurestat. The compressor relative to the circuit under alarm
will be stoppped.
Ver. 1.0 dated 21/10/94 37
AL10
+--------------------+
¦ ¦
¦Liquid ¦
¦Level ¦
¦ ¦
+--------------------+
High level of the coolant.
AL11
+--------------------+
¦ ¦
¦Pressostat ¦
¦Low Pressure ¦
¦ ¦
+--------------------+
AL12
+--------------------+
¦ ¦
¦Pressostat ¦
¦High Pressure ¦
¦ ¦
+--------------------+
A general high pressure condition makes all compressors stop.
AL13/15
+--------------------+
¦ ¦
¦Mainternance ¦
¦Compressor 1/3 ¦
¦ ¦
+--------------------+
This alarm mask informs the Operator that the working hours of the compressors exceed the
previously set threshold. Contact maintenance service.
AL16
+--------------------+
¦ ¦
¦Inlet probe ¦
¦faulty or disconn. ¦
¦ ¦
+--------------------+
This alarm mask informs the Operator that the inlet probe is broken. The unit turns off
automatically - if such an option has been previously selected via dedicated mask.
Ver. 1.0 dated 21/10/94 38
AL17
+--------------------+
¦ ¦
¦Outlet probe ¦
¦faulty or disconn. ¦
¦ ¦
+--------------------+
Faulty outlet probe.
AL18
+--------------------+
¦ ¦
¦High Pressure ¦
¦inlet ¦
¦ ¦
+--------------------+
The suction probe measures too high pressure values in the circuit.
AL19
+--------------------+
¦ ¦
¦High Pressure ¦
¦Outlet ¦
¦ ¦
+--------------------+
The delivery probe measures too high pressure values in the circuit.
AL20
+--------------------+
¦ ¦
¦Low Pressure ¦
¦Inlet ¦
¦ ¦
+--------------------+
The suction probe measures too low pressure values.
AL30
+--------------------+
¦ ¦
¦Faulty ¦
¦Eeprom ¦
¦ ¦
+--------------------+
pCO's eeprom must be replaced. Contact qualified service personnel.
Ver. 1.0 dated 21/10/94 39
AL31
+--------------------+
¦ ¦
¦Lack or faulty ¦
¦clock ¦
¦ ¦
+--------------------+
The clock card has been erroneously selected or it is damaged.
Carel reserves the right to modify its products without prior notice.
Loading...