Siemens SIPROTEC 7SS523 V3.2 Manual page 305

Testing the
fiber-optic cables
Testing the
FO interface
Check the checkbox Weitere Parameter anzeigen.
In parameter Test mode for module SK (5108A/CU), click the column Wert.
You will now see a list of setting options.
Click On in the list and then OK.
The second way describes how the test mode is activated by the hardware:
Set jumper X34 on the ZPS-SK module to "on". For the location of the jumper on
the board, and the jumper settings of the ZPS-SK module, please refer to Chapter
A.4.1, page 340.
Reset the device by switching the auxiliary voltage off and on again.
To further locate the failure, test the affected duplex channel by shorting it with a fiber-
optic cable between the transmitter and the receiver. A short FO cable is included in
the delivery of the central unit.
If the substation is operating and the control voltage for the TRIP circuits is on, an
additional safeguard against spurious tripping must be provided by setting the
marking TRIP commands blocking to on (see Chapter 6.3.2.1, page 219).
Short the affected duplex channel with a fiber-optic cable between the transmitter
and the receiver. You can short as many duplex channels as you like. If the failure
disappears after installing the fiber-optic cable, the signal path, including the LMZ
converter module, is healthy.
Remove the fiber-optic cable which connects the transmitter and the receiver of the
channel you have just checked.
Reconnect the fiber-optic cables running to the bay unit.
Connect the fiber-optic cables on the bay unit using a fiber-optic coupler. This
coupler is included in the delivery of the central unit. It allows you to check
transmission paths with a length of up to 750 m.
After completion of the test, remove the jumper from the ZPS-SK module and re-
establish the old settings.
If the test of the fiber-optic cables has been successful as well, the cause of the
disturbed channel is very probably a defect on the bay unit.
Try to replace the bay unit by a different one.
The functionality of the FO interface can be tested. Before carrying out test, the FO
connection to the central unit must be disconnected and at the bay unit, the receiver
must be bridged with the transmitter via an optical fibre.
The test function of the bay unit can be started via the membrane keypad or with
DIGSI. "4100 TEST OF COM MUNICAT.INTERFAC"
The test takes approx. 10 s. Afterwards, the fault rate is displayed (in %). After the test,
the jumper must be replaced with the correct optical fibre again.
7SS52 V4 Manual
C53000-G1176-C182-1
Fault Analysis
289