Auxiliary Functions; Message Processing; Leds And Binary Outputs (Output Relays) - Siemens SIPROTEC 7SK80 Manual
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2.18
Auxiliary Functions
The general functions of the device are described in chapter Auxiliary Functions.
2.18.1
Message Processing
After the occurrence of a system fault, information regarding the response of the protective relay and the mea-
sured values is important for a detailed analysis. An information processing function in the device takes care
of this.
The procedure for allocating information is described in the SIPROTEC 4 System Description.
Applications
• LEDs and Binary Outputs
• Information via Display Field of the Device or via PC
• Information to a Control Center
Prerequisites
The SIPROTEC 4 System Description provides a detailed description of the configuration procedure (see /1/).
2.18.1.1 LEDs and Binary Outputs (Output Relays)
Important events and conditions are indicated via LEDs on the front cover. The device furthermore has output
relays for remote signaling. Most of the messages and indications can be allocated, i.e. configured differently
from the delivery condition. The Appendix of this manual deals in detail with the delivery condition and the al-
location options.
The output relays and LEDs may be operated in a latched or unlatched mode (each may be set individually).
The latched conditions are protected against loss of the auxiliary voltage. They are reset
• locally by pressing the LED key on the relay,
• remotely using a binary input configured for that purpose,
• via one of the serial interfaces,
• automatically at the beginning of a new pickup.
Condition messages should not be latched. They also cannot be reset until the criterion to be reported is can-
celed. This applies, for example, to messages from monitoring functions or similar.
A green LED indicates operational readiness of the relay ("RUN"); it cannot be reset. It goes out if the self-check
feature of the microprocessor recognizes an abnormal occurrence, or if the auxiliary voltage is lost.
When auxiliary voltage is present but the relay has an internal malfunction, then the red LED ("ERROR") lights
up and the relay is blocked.
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
Functions
2.18 Auxiliary Functions
241
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