8.5.2 Alarm description
8.5.2.1 Overvoltage alarm
ACTIVATION
The overvoltage alarm is activated if the voltage reading of the R5 Controller is above the value defined by
parameter Overvoltage alarm threshold Chap. 7.5.1 for a time (in sec) equal to the value of parameter Overvoltage
alarm delay Chap. 7.5.2.
MANAGEMENT
The activation of the overvoltage alarm triggers the "slow" disconnection of all banks, one at a time, and with a
delay between them equal to P.4 – Transient time during disconnection (Chap. 7.6). This process takes place in
automatic power factor correction mode for all the inserted banks whose Step n function (n=1,2,3,4,5) Chap. 7.2.5 has
been set to “CAP” or “ON” and in manual power factor correction mode (refer to Chap. 8.8 - Manual power factor
correction mode) for all the banks whose status has been set to "ON".
At the same time, the relay outputs set as "ALA" and associated to the "THHV" or "ALL" alarm will be activated
unless parameter P.25 – Alarm masking management (Chap. 7.6) has been set to mask the alarms under defined
operating conditions.
DISPLAYING
Independent of the current displaying, the alarm will be indicated
with the displaying of the relevant page of the Current alarm menu
that will be alternately shown with the numerical value
corresponding to the maximum voltage value measured since
alarm activation (450V in the example shown).
The Controller will stay in the above-mentioned screen until:
- key is pressed for more than 2sec (the alarm is anyway active);
- alarm is deactivated or manually reset by the operator.
Afterwards, the Measurement Menu will be automatically displayed and will show, respectively:
- the cosphi value and the alarm icon on the top left. The alarm will be anyway active in the Current Alarm Menu
(Chap. 8.5.1);
- the cosphi value, but not the alarm icon.
If, parameter P.25 – Alarm masking management (Chap. 7.6) has been set to mask the alarms under defined
operating conditions, the previous screen will be temporarily displayed for 3sec. The alarm will then automatically go back
to the first screen of the Measurement Menu by displaying the cosphi value, but not the alarm icon. The alarm will be
anyway present in the Current Alarm Menu.
STATISTICS
The alarm counter will be increased in the Statistics Menu (Chap. 8.4) at every occurrence.
DEACTIVATION
The alarm is automatically deactivated if the voltage reading of the R5 Controller is below the value defined by
parameter Overvoltage alarm threshold Chap. 7.5.1 for a time (in sec) equal to the value of parameter Overvoltage
alarm delay Chap. 7.5.2.
RESET
Alarm can be manually reset from the Current Alarm Menu by pressing key (function possible only if P.13 –
Current alarm reset = “ON”, refer to Chap. 7.6).
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