Carel PlantWatch

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Cod. Carel. +030221221 – rel. 1.0 dated 20/02/01
15
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The presence of at least one active alarm is signalled by the flashing of the red LED. If the alarm has been generated by a
peripheral (instrument or printer module), the symbol on the main screen relating to the peripheral in question flashes. In the
event where all the alarms are over, the LED remains on. It will turn off only if the user enters the display of the alarm/event log.
The alarm button % has the following functions, depending on the status of the buzzer and the presence or otherwise of active
alarms:
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Active alarms and buzzer on pressing once silences the buzzer
pressing again displays the active alarm log
Active alarms and buzzer disabled pressing once displays the active alarm log
Active alarms and alarm relay activated pressing for 3 seconds disables the relay
No active alarms and red LED stays on displays the alarm/events log (all), scrolling limited to backwards, so
as to show only the events occurring after the last display; turns off
the red LED
No active alarms and red LED off the text “no alarm” is displayed
The alarm log can also be displayed from the “GLVSOD\ HYHQW ORJ” menu, by selecting “All”, the entire list of alarms can be
scrolled in chronological order, without limits, while selecting “RQO\DFWLYH” limits the scroll to the active alarms only.
The alarms are saved to the log and printed, if activated, upon being received from the instruments, or at the moment of
generation for events managed internally by PlantWatch.
The EX]]HU activation mode can be selected. The buzzer can be disabled, enabled with automatic silencing after a set time, or
alternatively enabled to remain on whenever there is at least one active alarm or until the operator presses the alarm button.
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PlantWatch allows the alarms generated by a specific instrument to be temporarily disabled during the maintenance of the
controlled unit (e.g. cleaning). The alarms must be re-enabled by the user when the unit returns to service. A safety timer re-
enables the alarms 48 hours after disabling. This delay can be set using the 3ODQW:DWFKPDQDJHU configuration program. In the
event of power failures affecting PlantWatch, the re-enabling time is counted from when power returns to the device .
This operation can be performed from the screen that displays the values read by the instrument, by pressing the Prg and
“Alarm” buttons together for 3 seconds; a beep of the buzzer and a message confirm the command, and a flashing “X’ will
appear in the place of the “:” following the address of the unit. The disabled alarms status is also displayed on the main screen by
an x inside the symbol corresponding to the unit in question.
To re-enable the alarms, simply repeat the operation described above. If this action is performed when there are active alarms, a
corresponding message will be displayed to warn the operator of this situation.
Each intervention by the user to disable/enable the alarms is recorded in the event log.