GE Reason RT430 - Maintenance; Synchronism failure (Locked Signaling)

GPS Grandmaster Clock
74
RT430-TM-EN-5
6. MAINTENANCE
6.1 Synchronism failure (Locked Signaling)
When the unit is operating without synchronism reference in the GPS antenna, the failure is signaled in
different ways: Local interface, Web Interface, signaling relay, and data packets from IRIG-B, NTP, PTP e
SNMP protocols.
When synchronism failure is detected, some providence is recommended:
 Check for configuration being transmitted to the unit. During transmission, the unit should
momentarily go out of operation to reboot. This behavior is normal and no action is required. The
LOCKED indicator will lit as soon as the unit resumes operation.
 Make sure the GPS antenna is properly connected to the unit, as the specifications of Chapter 2.
 Make sure the antenna cable being used is in accordance with the specifications presented in
Chapter 1.
 Make sure the unit is synchronized with at least 4 GPS satellites by checking the Web Interface.
Otherwise, check the location of the antenna, making sure that it is installed according to the
recommendations of Chapter 2.
6.1.1 Locked indicator (IHM)
The LOCKED indicator located in the front panel will be off when there is no synchronism reference in the
GPS antenna input. As soon as a GPS antenna is connected, the indicator will start blinking while it
downloads a satellite almanac. This behavior is normal and no actions are necessary. The LOCKED indicator
will stop blinking and stay lit as soon as the download is completed (it may take a few minutes when a unit is
moved over long distances or has been out of operation for a long period of time).
6.1.2 Remote monitoring (Web Interface)
In the monitoring area of the Web Interface it is shown the information LOCKED and the number of satellites
when there is synchronism reference in the GPS antenna input, and UNLOCKED when reference is
disconnected.
6.1.3 Dry-contact relay (LOCKED)
RT430 has a dry-contact normally closed for remotely signaling the synchronism state of the unit. As the unit
is powered up, the dry-contact LOCKED is normally closed. Synchronism information from at least 4 GPS
satellites is required for the dry-contact to open. In case the unit loses GPS satellite reference, the dry-
contact closes signaling synchronism loss.