Mounting and Commissioning
3.2 Checking Connections
SIPROTEC, 7SC805, Manual
C53000-G1140-C380-1, Release date 05.2014
91
Checking the Time Synchronization Interface
When connecting the time signal transmitter (GPS and IRIG-B), the specified technical data must be observed
(see Chapter 4 Technical Data, “Time Synchronization Interface”).
The GPS suplies UTC time and the IRIG-B
module supplies time without the time zone
and switchover to/from daylight-saving time. You can adapt your
time zone to the time signal by entering an offset time (in minutes) on the device or via DIGSI. If the EN100
module is parameterized, you can set the daylight saving time/standard time in DIGSI. Proper functioning is
indicated by the fact that 20 minutes max. after device startup or selection of GPS as time source, the time
status is indicated as
“Synchronized”
accompanied by the operational indication “
Clock SyncError (OFF)”
.
If the time is still indicated as faulted after 20 minutes, check the operational log. If there is
error indication
regarding the time sync module
, check the antenna connection.
In continuous operation, with GPS as time signal transmitter, it might happen that the time management issues
the operational indication “
Clock SyncError (ON)”
although the time was correct before. This might be caused
by one of the following conditions:
• The GPS module does not have enough satellites in view and is therefore not able to determine the correct
time. The cyclic synchronization can be absent for up to 10 minutes before the time is considered faulted.
As soon as a valid satellite signal is received, the clock error is reset “
Clock SyncError (OFF)”
.
• If the indication "
GPS Module Error ON
" was issued in the operational log and has been pending for a longer
period of time, please send the device in for a check.
With IRIG-B as time sync signal, if there is error indication in continuous operation, the time sync generator
and the connection should be checked.
Further information can be found in the SIPROTEC 4 System Description/1/.
Table 3-3
Time status
3.2.2
Checking the System Connections
WARNING!
Warning of dangerous voltages
Non-observance of the following measures can result in death, personal injury or substantial property damage.
Therefore, only qualified people who are familiar with and adhere to the safety procedures and precautionary
measures should perform the inspection steps.
No.
Status text
Status
1
– – – – – – – –
synchronized
2
– – – – – – ST
3
– – – – ER – –
not synchronized
4
– – – – ER ST
5
– – NS ER – –
6
– – NS – – – –
Legend:
– – NS – – – –
– – – – ER – –
– – – – – – ST
time invalid
time fault
summertime
