Siemens siprotec 7SA522, Руководство пользователя

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Control During Operation
7-23
7SA522 Manual
C53000-G1176-C119-2
sentations. The possible representations and the associated causes are listed in Table
7-3.
? appearing in the date and time field indicate that the clock synchronisation has been lost.
Item 1 appears if the internal clock RTC did not have a valid time upon start-up. The
messages in the memory buffers are dated 01/01/1990.
Corrective action: Set the date and time manually (see margin header “Changing the
Time” below).
No. 2 appears if the time was actually set, but not synchronized. This can happen:
−
briefly upon device power-up,
−
if synchronization is lost; that is, if the cyclical synchronization is interrupted for a
time longer than the set tolerance time.
Corrective action: If an external synchronizing source is being used, check the source
and the connection.
No. 3 is displayed if the RTC had a valid value upon device start-up but the time was
neither manually set nor synchronized since.
Corrective action: Set the date and time manually, or wait until the cyclical synchroni-
zation takes effect.
No. 4 displays the normal condition; that is, the time is synchronized cyclically accord-
ing to the type of operation.
No. 5 is displayed if synchronization via the system interface is marked as “invalid”.
Changing the Time The time can be changed
−
By setting the time manually, using the integrated control panel or ;
−
By adjusting the settings for time control.
The date and time can be manually set during operation, provided the device allows
this. A precondition is that the appropriate type of operation for time control must be
selected (see Section 5.7).
When the source of time synchronisation is “internal” or “pulse via binary input” the
date and time can be manually set during operation at any instant. The annunciations
“time error ON” and “time error OFF” appear in the annunciation log to indicate time
synchronization and loss of time synchronization, respectively.
Table 7-3 Representations of Date and Time:
Item Display (Example) Year Time
Malfunction
Time Invalid
Date Time
1
HH HH HHHH
"
Year = 1990 irrelevant
2
"
1990<Year<2090
Yes No
3
" "
Yes Yes
4 No No
5
HH
"
HH HHHH
"
No Yes