1MAC309294-MB F Section 3Basic functionsRER620 51Technical ManualThe relay can use one of two SNTP servers, the primary or the secondary server. Theprimary server is mainly in use, whereas the secondary server is used if the primary servercannot be reached. While using the secondary SNTP server, the relay tries to switch backto the primary server on every third SNTP request attempt. If both the SNTP servers areoffline, event time stamps have the time invalid status. The time is requested from theSNTP server every 60 seconds.IRIG-B time synchronization requires the IRIG-B format B000/B001 with IEEE-1344extensions. The synchronization time can be either UTC time or local time. As no rebootis necessary, the time synchronization starts immediately after the IRIG-B sync source isselected and the IRIG-B signal source is connected.ABB has tested the IRIG-B with the following clock masters:• Tekron TTM01 GPS clock with IRIG-B output• Meinberg TCG511 controlled by GPS167• Datum ET6000L• Arbiter Systems 1088B3.5 Parameter setting groupsThere are four relay variant specific setting groups. For each setting group, the parametersetting can be made independently.The active setting group can be changed by parameter (setting groups 1...6) or via binaryinput (setting groups 1...6), if a binary input is enabled for it.To use a binary input to change setting groups use ACT (Application Configuration Tool)to program a Hardware Channel Binary input to the Protection block.Table 32: Active setting group binary input stateThe setting group parameter is overridden when a binary input is used for changing theactive setting group.IRIG-B time synchronization requires a COM card with an IRIG-B input.Available only with some models.BI state Active setting groupOFF 1ON 2
