Sices D-PRO, Техническое руководство

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D-PRO Protection relay Technical Manual 29
7.
This chapter describes all the faults managed by the protection relay. All the faults connected
to the protections are considered as alarms while the other are signals of particular events in
the management of the plant, which are usually considered as warnings.
We define three typologies of anomaly:

Warnings : these faults indicate situations that are not dangerous at the moment, but
if ignored they could degenerate in one of the following categories.

Alarms : these faults are considered dangerous for the loads and/or for the
engine/genset. It is not possible to restart the engine until the anomaly is
acknowledged.
When an anomaly activates, the controller performs the following:
•
It activates the acoustic horn (if configured).
•
It forces the visualization of the message on the multifunctional display of the
DST4602 controller connected to it. This page shows the fault numeric code and the
current language text related to the anomaly.
The numeric code flashes to indicate
that the anomaly hasn't been recognized by the operator yet.
The following operations can be carried out on an anomaly:
•
Silence the horn.
•
Acknowledge it : this informs the controller that the operator has acknowledged the
event.
•
Reset: it tells to the board that the anomaly is not more active.
The multifunction display of the DST4602 controller shows the anomaly until the operator
acknowledges it, even if the related cause is no longer present (ISA2C sequence). The
controller automatically resets all the acknowledged warnings when their cause is not still
active.
7.1
It is possible to silence the horn in two ways:
•
By pressing the ACK/TEST key on the DST4602 controller. This operation does not
detect the anomaly, which continues to flash on the display.
The management of the acoustic horn is anyway connected to the value of the parameter
P.0491
(“duration of horn control”):
•
If set to zero, the horn will be never activated.
•
If the horn is set to 999, it will be activated when a new anomaly arises and deactivated
with the procedure described above.
•
If the horn is set to a value between 1 and 998, it will be activated when a new anomaly
arises and deactivated with the procedure described above, or when the configured
time has elapsed.