Sices D-PRO, Technical Manual

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32 D-PRO Protection relay Technical Manual
The protection is always enabled.
It activates if the battery voltage is continuously above threshold P.0393 for time P.0394. The
threshold is expressed as a percentage of the rated battery voltage, which cannot be
configured but it is automatically selected by the controller between 12 e 24 Vdc. The selection
is carried out when the controller is powered. If the controller previously measured a value
lower than, or equal to, 17 Vdc, it considers to be powered by a 12 Vdc battery; otherwise, it
will consider a 24 Vdc rated voltage.
Type: Alarm
Measuring: V1-V2-V3 Phase voltages
Related parameters: P.0101 Genset phases number
P.0102 Genset rated voltage
P.0321 Minimum voltage threshold
P.0322 Minimum voltage delay
P.0130 Thresholds on VLN
To disable: P.0322=0
The protection is enabled only in case of absence of the disabling digital input (usually
combined to the circuit breaker status).
It is enabled if at least one of the genset voltages is decreases below the threshold set in
P.0321 (percentage of P.0102) for the time configured in P.0322.
This protection can be used individually or in together with 27T.
Type: Alarm
Measuring: V1-V2-V3 Phase voltages
Related parameters: P.0101 Genset phases number
P.0102 Genset rated voltage
P.0325 Select if the threshold is time-dependent
P.0326 Time-dependent minimum voltage threshold
P.0327 Time-dependent minimum voltage delay
To disable: P.0327=0
The protection is enabled only in case of absence of the disabling digital input (usually
combined to the circuit breaker status).
Using the parameter P.0325, the threshold can be configured as time-independent (fixed delay
that can be adjusted with the parameter P.0327) or as time-dependent; in this case, the
intervention time is calculated according to the following formula:






−

=
0326 .
1
0327 . 75 , 0
(sec)
P
V
P
t
I
V represents the genset voltage.
The protection activates if at least one of the genset voltages decreases below the threshold
set in P.0326 (percentage of P.0102) for the time configured in P.0327 (if time-independent)
or for the time calculated Ti (time-dependent).