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2 Functions
2.35
Ancillary Functions
Chapter Ancillary Functions describes the general device functions.
2.35.1 Processing of Annunciations
After occurrence of a system fault, data regarding the response of the relay and the
measured quantities should be saved for analysis purposes. For this reason indication
processing is done in three ways:
2.35.1.1 Functional Description
Displays and Binary Outputs (output relays)
Important events and statuses are displayed using front panel LEDs. The relay also
contains output relays for remote signaling. All LEDs and binary outputs indicating
specific messages can be freely configured . The relay is usually delivered with a
default setting. The SIPROTEC 4 System Description /1/ gives a detailed description
of the configuration procedure. The allocation settings on delivery are listed in the Ap-
pendix of this manual.
The output relays and the LEDs may be operated in a latched or unlatched mode
(each may be individually set).
The latched conditions are protected against loss of the auxiliary voltage. They are
reset
• on site by pressing the LED key on the relay,
• remotely using a binary input configured for that purpose,
• using one of the serial interfaces,
• automatically at the beginning of a new pickup.
Status messages should not be stored. Also, they cannot be reset until the criterion to
be reported is remedied. This applies to indications from monitoring functions or sim-
ilar.
A green LED displays operational readiness ("RUN"), and cannot be reset. It goes out
if the self-check feature of the microprocessor recognizes an abnormal occurrence, or
if the auxiliary voltage fails.
When auxiliary voltage is present, but the relay has an internal malfunction, then the
red LED ("ERROR") lights up and the device is blocked.
Information via Display Panel or PC
Events and statuses can be read out on the display panel on the device front panel.
Using the front interface or the service interface, a PC also can receive the informa-
tion.
In the quiescent condition, as long as no system fault is present, the display panel can
display selected operating information (overview of operating measurement values).
In the event of a system fault, fault information, so-called spontaneous display indica-
tions, appear instead. After the fault related indications have been acknowledged, the
quiescent data are shown again. Acknowledgement can be performed by pressing the
LED buttons on the front panel (see above).
208
7UM61 Manual
C53000-G1176-C127-3
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