Carel FLSTDMFC0A, Manual

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FLSTDMFC0A pCO² refrigeration system
cod. Carel +030221991 rel. 1.0 dated 27/07/01
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There are various ways to activate or deactivate the control and the management of the various devices with related alarms:
(in order of priority):
1. from the alarms: the screen (M_PROG12) can be used to select if a faulty probe alarm is to turn the unit off or not
2. from the supervisor: the screen (M_PROG12, PROG branch) is used to enable shut-down from the supervisor
3. from digital input (if configured, M_CONF_DEV06 configuration branch), in addition to the screen
(M_LOGIC_ONOFF configuration branch), the logic can be selected
4. from the keypad : if enabled on the screen (M_ON_OFF_UNITA, maintenance branch) pressing the ON-OFF button
turns the unit on or off. For Built-in terminals, to switch the unit on-off simply go to the main screen
(M_MAIN_MENU) and press the UP button, then select whether to switch the machine on or off
5. from the screen: the unit can be turned off or on from the screen (M_MAINT20)
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The pCO system allows connection to the main supervisory systems, using interface boards and suitable protocols.
In this application program, the following data is exchanged with the supervisor:
•
display of the status of the inputs / outputs,
•
the status of the enabled devices,
•
any alarms present, and in the memory
•
the enabling of the devices, various management, etc.
Furthermore, a number of parameters can be modified, such as: set point, differential, time settings, unit status, alarm reset, etc.
Also see paragraph 5.2 Variables used in communication with the supervisor, which lists in detail all the variables currently
available to the supervisor.
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For connection to the supervisory systems, the pCO² is designed to support the main and most common communication
standards.
As a result, connection boards are available for the following standards:
•
optically-isolated RS485 serial connection board for pCO² PCO2004850
•
RS232 serial connection board per modem, not optically-isolated, for pCO² PCO200MDM0
•
LON RS485 serial connection board for pCO² PCO20L4850
•
LON FTT10 serial connection board for pCO² PCO20LFTT0
The user may, depending on requirements, decide whether to install the board or not. The board allows connection to a
supervisory system for the transmission of all the parameters set in the pCO²
In addition, an external GATEWAY is available for communication with the BACNET protocol.
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The pCO² line supports and integrates two communication protocols, MASTERPLANT CAREL and MODBUS, into the
machine's operating system.
As well as installing the board, for the correct operation the identification number of the pCO² needs to be set and the board
needs to be enabled (M_CONF_SUPERV configuration branch, initialisation), and the communication protocol used needs to be
selected.
Each pCO² must have its address defined so that:
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on the same serial line
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other devices with the same address
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the addresses of pCO²s on the same serial line must be set in progressive order, starting from no. 1
As well as the two protocols, boards are also available for LON networks. All the variables defined in the tables for
communication with the supervisor can be used in communication with the LON network, but with a maximum limit of 59.
When programming the boards, these variables must be defined.
For further information, refer to the corresponding manual or contact CAREL.