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Alarm can be manually reset from the Current Alarm Menu by pressing key
"
Current alarm reset =
8.5.2.5 THDI alarm
ACTIVATION
The THDI alarm is activated if the THDI% value stays above the value defined by parameter THDI alarm threshold
Chap. 7.5.11
for a time (in sec) equal to the value of parameter THDI alarm delay
MANAGEMENT
The activation of the THDI alarm triggers the "slow" disconnection of all banks, one at a time, and with a delay
between them equal to P.4
This process takes place in automatic power factor correction mode for all the inserted banks whose Step n function
Chap. 7.2.5
(n=1,2,3,4,5)
- Manual power factor correction mode
At the same time, the relay outputs set as "ALA" and associated to the "THD%A" or "ALL" alarm will be activated
unless parameter P.25
operating conditions.
DISPLAYING
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
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 (
DEACTIVATION
The alarm is automatically deactivated if the THDI% value stays below the value defined by parameter THDI alarm
Chap. 7.5.11
threshold
RESET
Alarm can be manually reset from the Current Alarm Menu by pressing key
"
Current alarm reset =
8.5.2.6 THDV alarm
ACTIVATION
MU-MID-R5-D-ENG.doc
"
Chap. 7.6
ON
, refer to
).
–
Transient time during disconnection (
"
"
has been set to
CAP
) for all the banks whose status has been set to "ON".
–
Alarm masking management (
Alarm masking management (
for a time (in sec) equal to the value of parameter THDI alarm delay
"
Chap. 7.6
ON
, refer to
).
Chap. 7.6
"
"
or
ON
and in manual power factor correction mode (refer to
Chap. 7.6
) has been set to mask the alarms under defined
Regardless 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
corresponding to the maximum THDI% value measured since
alarm activation (10% in the example shown).
Chap. 7.6
) has been set to mask the alarms under defined
Chap. 8.4
) at every occurrence.
(function possible only if P.13
Chap. 7.5.12
.
).
shown
with
the
Chap. 7.5.12
(function possible only if P.13
–
Chap. 8.8
numerical
value
.
–
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