Siemens siprotec 7SA522, User Manual

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Control During Operation
7-2
7SA522 Manual
C53000-G1176-C119-2
7.1 Read-out of Information
General The device provides a great deal of information that can be obtained on-site or from
data transfer:
•
Messages,
•
Operating measurement and metered values,
•
Waveform data in oscillographic fault records.
This information is individually discussed below. Methods for viewing, retrieving, ac-
knowledging, and storing this information on a PC are also explained.
7.1.1 Messages
7.1.1.1 Output of Messages
Messages provide operating information about the power system, the device, and the
measurements. Other messages give an overview of important events such a network
fault and the operation of device functions. The information provided is useful in
checking overall operation of the device during testing and commissioning.
Password entry is not required to read messages.
The messages generated in the device can be presented in various ways:
•
Display using light-emitting diodes (LEDs) on the front of the device,
•
Operation of output relays connected to external signalling equipment,
•
Display in the LCD on the front of the device,
•
Display on the screen of a PC running the DIGSI
®
4 program, connected to the op-
erating or service interface of the device,
•
Transfer to a master station using one of the serial system interfaces (if available).
Light-Emitting
Diodes The green light-emitting diode with the label “RUN” lights continuously during normal
operation.
The red LED with the label “ERROR” indicates that the processor system has recog-
nized an internal problem. If this LED lights up, then the device is not operational.
Chapter 9 discusses steps to take if a failure occurs in the device.
The other LEDs on the front of the device display the messages in accordance with
the configuration, as discussed in Chapter 5. The description of each LED illumination
should then be indicated on the label strips.
If the messages for the LEDs are latched, then the memory can be reset with the LED
key
. This key simultaneously serves as a functional check for all of the LEDs ex-
cept the “RUN” and “ERROR” LEDs. While the key is pressed, all of these LEDs must
light.
LED