Fault Analysis
295
7SS52 V4 Manual
C53000-G1176-C182-3
The green LED shines when the module is running without faults. The red LED is lit in
the event of a module failure. In the event of failure of a configured bay, but normal
function of the module, the green LED flashes in addition to the shining red LED.
Reset of the ZPS
modules
To reset a central processor module (ZPS):
Press the reset button on the module concerned. The button is located below the
LEDs (Figure A-7, page 348). When you reset the ZPS-SBK module, the central
unit is restarted, and the setting parameters related to the bay units are updated.
SV module
LED ON means that the corresponding auxiliary voltage is available.
If the LED indication fails completely, check the auxiliary voltage supply (Chapter
8.2.2, page 293), replace the fine-wire fuse (Chapter 8.4.2, page 306).
8.2.4 Analysis of Internal Communication Failures
The following components of the protection participate in the protection-internal fast
data transmission (Figure 8-1, page 295):
Figure 8-1 Components for data transmission
If the protection system is blocked, the cause may be a failure in the communication
system, or in a bay unit. The faulty bay is shown in the alarm list which can be called
up by pressing the function key F1 on the central unit.
Table 8-4 LEDs of the SV module
LED
designation
Colour Function
+ 5V
+ 15 V
+ 24 V
Green
Green
Green
Auxiliary voltage for supply of the processor modules and for the
alarm relay “device failure”
Alarm relay voltage
Alarm relay voltage
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