REF620 time synchronisation not working
We have REF620 relay set to "Time Sync Source" as SNTP, and have set the SNTP IP to as per the DCS required IP.
However, the REF620 relay "System Time" still does not sync with the DCS system.
Can anyone advise what could be wrongly set or any other settings overlooked?
Setting up the SNTP time synchronization should be as easy as you have already done. You only need to define the Synch source and SNTP server address.
First thing to find out the problem root cause is to check the Monitoring menu of the IED. In LHMI from 'Monitoring > IED Status > Time Synchronization' to see if REF620 can find the synch source. If the synch status is 'Down', then REF620 can't get a proper SNTP synch from the server.
Possible root cause for not receiving the synch messages are misconfigurations in communication network (addresses, firewalls, etc.).
Other possible reason might be that the SNTP requests are answered too slowly by the server. REF620 Technical Manual mentions the following:
With SNTP, it is required that the SNTP server responds to a request within 12 ms, otherwise the response is considered invalid.