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4.2
Front Panel LED Indicators:
The
GPS
LED shows the status of the GPS receiver, while the
SYN
LED shows the status
of the time synchronisation to UTC reference time derived from the GPS satellites.
By default, all outputs become active within a few seconds of initial power-up
even when the unit is
not
synced to GPS satellite time! Output time data is not
precise until the unit is synced to the GPS satellite
4.2.1 Warning Status Indications (SYN LED = OFF)
When the SYN LED is off, TCG-01 is not guaranteed to be synchronised to UTC time. The
sync relay is deactivated (“C” is connected to “NC”).
GPS LED
SYN LED
Interpretation
• • • •
• • • •
4 short flashes/second
OFF
Antenna fault: The GPS antenna is not connected,
or is short or open circuited (faulty).
••••
••••
2 short flashes/second
OFF
The GPS antenna is good, and the unit is
searching the sky for satellites to begin the sync
process.
On D4 and later version TCG-01s, a “test mode” is available that when activated
will cause all TCG-01 outputs including the sync relay to behave as if they are in
sync, even if they are not. This can be useful for testing the operation of external
IED when a connection to a GPS antenna is not available.
4.2.2 Sync Status Indications (SYN LED = illuminated)
When the SYN LED is on, TCG-01 is synchronised to UTC time. All of the clock outputs
are accurate and are usable for sync purposes and the sync relay output is activated.
GPS LED
SYN LED
Interpretation
••••••••••••••••••••••••••••
••••••••••••••••••••••••••••
Long on – short off
once every second
ON
Time accuracy is within 500ns of UTC time.
•••••••
•••••••
Short on – long off
once every second
ON
Time accuracy is certainly within 60ns and is typically
within 40ns of UTC time
