Siemens SICAM Q80 Operating Instruction page 42

E-42 SICAM Q80 7KG8080
Synchronization
11.3
The simplest synchronization method for SICAM Q80 7KG8080 devices is to use
If the devices are connected via the network interface, then if there is an NTP-Server this line can be used for
synchronization.
Further, on the terminal panel there is a terminal labeled SYNC. Depending on the configuration, an external
synchronization signal (DCF77, GPS or IRIG-B) can be received.
Technical specification of the synchronization.
Note
11.3.1 Type of synchronization signal
11.3.1.1 DCF77
The DCF77 signal is applied via the connector labeled
SICAM Q80 7KG8080 processes a LOW active 24 V signal (High > 18 V; Low < 12 V with a slope of less than 8
µs). As well, inverted signals are recognized and evaluated by the hardware. LOW active signals achieve
somewhat better precision (in the range of a few µs) than HIGH active signals.
Duration of synchronization: The complete time is encoded within one minute and begins at the start of the next
minute.
For this reason the minimum duration for the synchronization process is at least one minute!
11.3.1.2 IRIG-B
The IRIG-B signal is applied via the connector labeled
and supports IRIG-B002, B000, B001, B003. LOW active signals achieve somewhat better precision (in the range
of a few µs) than HIGH active signals.
For all models, the pulse rate is 100 pulses per second, DC Level Shift (DCLS), width coded, no carrier. The last
digit indicates the correct information:
BCD, CF, SBS
B000
B001 BCD, CF
BCD
B002
BCD, SBS
B003
Duration of synchronization: With a typical synchronization time of approx. 20s, the IRIG-B is the fastest model
available.
11.3.1.3 GPS
The GPS receiver is connected at the 9-pin DSUB terminal
7KG8080. The receiver must deliver a PPS signal having a pulse duration of > 5ms. In this way, the GPS receiver
finds its positions as soon as the device is activated.
Duration of synchronization process: The minimum duration for synchronization depends on the reception and
on the last location of use. Upon first use, the receiver needs a few minutes until multiple satellites and its own
Power Quality Recorder SICAM Q80 7KG8080, Operating instruction
E50417-B1074-C419-A2, Release 12.01.2015
76
The synchronization settings are always made prior to the measurement. If these settings
are changed, then the parameters must be re-sent to the device.
Be sure to observe the settings for the time zone and DST/Standard Time, as described in
the system manual.
DCF77 signal with inverted logic (Low active)
BCD - Binary Coded Decimal, Code of the time (HH,MM,SS,DDD)
SBS - Straight Binary Second of day, daily second (0....86400)
CF - Control Functions, depending on application
NTP
SYNC .
41
SYNC . SICAM Q80 7KG8080 processes a 24 V signal
41
"GPS ". The supply is provided via SICAM Q80
40
via the Ethernet connection.
43