Maintenance and fault tracing7SV512
V1
108
C53000---G1176---C91
Clock module
on multi-pin socket
Figure 7.1 Position of the clock module
7.3 Fault tracing
Ifthe protective device indicates a defect, the follow-
ing procedure is suggested:
Ifnone of the LEDs onthe frontplate ofthe module is
on, then check:
--- Has the module been properly pushed in and
locked?
--- Is the ON/OFF switch on the front plate in the ON
position ¬ ?
--- Is the auxiliary voltage available with the correct
polarity and of adequate magnitude, connected
to the correct terminals (General diagrams in Ap-
pendix A)?
--- Has the mini-fuse in the power supply section
blown(seeFigure7.2)?Ifappropriate, replace the
fuse according to Section 7.3.1.
If the red fault indicator ”Blocked” on the front is on
and the green ready LED remains dark, the device
has recognized an internal fault. Re-initialization of
the protection system could be tried by switching
the processor system off and onagain (bymeans of
the switch on the front plate). This, however, results
in loss of fault data and messages if the relay is not
equipped with a buffer battery,and, if a parameteriz-
ing process hasnot yetbeen completed, the lastpa-
rameters are not stored.
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