Carel pCO User manual
Application program for pCO
Standard 1/3 compressor
pack control
Manual version: 1.0 - 21/10/94
Program code: EPSTDEFC2A
Rif.: 83EM
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: 21/10/1994 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
ef
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
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