Carel pCO2 Series Application Program

Standard air-conditioning units
Carel Cod. +030221421 – Rel. 1.2 – April, 11, 2003
36
20.0 ALARM DATA LOGGING
Alarms data logging allows storing the air-conditioning unit working state whenever an alarm goes off or under particular conditions. Any
storing operation becomes an event, which can be displayed as any other event available in the memory. As it functions as a device for “taking
photographs” of the system whenever any alarm goes off, data logging is extremely useful for suggesting possible causes and solving system
malfunctions and failures. The program is provided with a MAIN and a DEVELOPED data logging.
20.1 MAIN LOG (pCO1 – pCO2)
Events can be stored thanks to the pCO1-pCO2 boards very large buffer memory. The MAIN data logging can be enabled by parameter; if the
clock card (optional on pCO1, integrated on pCO2) is not available, neither the MAIN data logging is available. No additional optional card is
required.
The maximum number of storable events is 100; after the last space available in the memory (alarm no. 100) is used, next alarm will be
overwritten on the first alarm stored (001), which will be automatically deleted. This procedure applies to all following events. The user cannot
delete the stored events except at the default values installation. The MAIN data logging screen can be accessed by pushing button ALARM
when screen E4 is displayed and can be left by pushing button Menu (Esc if the built-in terminal is being used). The screen is displayed as
follows:
HISTORY_ALARMS
+--------------------+
¦Alarms historic H025¦
¦ ¦
¦Resistor 1 overload ¦
¦12:34 01/08/01¦
+--------------------+
Whenever an alarm goes off, the following air-conditioning unit data are stored for each alarm:
• alarm description
• time
• date
• event chronological number (0-100)
The event chronological number, displayed in the upper right corner, indicates the event “stay time” compared to the 100 available memory
spaces. Alarm no. 001 represents the first alarm gone off after MAIN data logging enabling.
Moving the cursor on the chronological number and using the arrow buttons, the alarms “history” can be scrolled from 1 to 100.
In position 001 and pushing the down arrow, the alarms cannot be scrolled.
If, for example, 15 alarms have been stored and the cursor is in position 015, pushing the up arrow, the alarms cannot be scrolled.
20.2 ADVANCED LOG (pCO2)
The events are saved in the 1MB or 2MB memory expansion, available on the pCO2 board. The advantages and characteristics of this log are as
follows:
• Log by event: a typical log by event is the alarm log. When an alarm is activated, the event is saved together with other significant
values (temperature, humidity, pressure, set point, etc.).
• Log by time: a typical log by time is the temperature/humidity log. The temperature and humidity values are saved at regular intervals.
• Log of logs: a typical log of logs involves the saving of the last alarms/temperature/humidity values recorded before a serious alarm.
Unlike the data saved for the log by event and log by time, this data is not overwritten when the memory is full.
• Possibility to choose the values to be saved and the saving options at any time. The “WinLOAD” program can be used to define, using
a practical “Wizard”, the values to be saved and the options. WinLOAD does not require the application program “files”, as it is able
to directly receive all the information required from the program installed on the pCO1 – pCO2.
• 1MB dedicated FLASH memory. The system saves the data in the 1MB FLASH memory in the memory expansion (code
PCO200MEM0). For example, 1MB of memory is able to store 5000 alarm events with 5 values per alarm, and record 2 values, such
as temperature and humidity, for 6 months, saved every 5 minutes.
• Possibility to define up to 7 different log configurations. Typically, each controller will have an alarm log, a log of the control values
(temperature/humidity/pressure) and some “logs of logs”.
• Possibility to display the data saved on the terminal LCD (external or built-in), or on a PC.
• “Black box” function. The memory expansion that contains the logs can be removed from the pCO² on the unit controlled and inserted
in another pCO² to display the data saved. The latter pCO² does not need to have the same application program as the original.
• Reliability of the data saved. The data are saved in FLASH memory, which does not require batteries that risk being discharged. If
following a software update the previously saved data are incompatible with the new software, all the data will be deleted (following
confirmation).
20.2.1 CONFIGURATION USING “WINLOAD”
The Advanced Log function, including all the options described above, is configured using the “On line help” feature in the WINLOAD32
program, the same used to upload the program software to the pC01 and pCO2 boards.

Carel pCO2 Series Specifications

General

Brand	Carel
Model	pCO2 Series
Category	Controller
Language	English