Time Synchronization; Time Master Supervision Gnrlltms; Function Block; Functionality - ABB Relion SMU615 Technical Manual

1MRS758407 B
3.4
3.4.1
3.4.1.1
3.4.1.2
SMU615
Technical Manual
Name Type
Programmable LED Enum
9
Programmable LED Enum
10
Programmable LED Enum
11

Time synchronization

Time master supervision GNRLLTMS

Function block

GNRLLTMS
ALARM
WARNING
EXCLKMSTR
GUID-52192013-86FE-40E4-B0A1-AB519C2B88A6 V1 EN
Figure 19: Function block

Functionality

The merging unit has an internal real-time clock which can be either free-running or
synchronized from an external source. The real-time clock is used for time stamping
events, recorded data and disturbance recordings.
The merging unit is provided with a 48 hour capacitor backup that enables the real-
time clock to keep time in case of an auxiliary power failure.
The setting Synch source determines the method to synchronize the real-time clock. If
it is set to "None", the clock is free-running and the settings Date and Time can be used
to set the time manually. Other setting values activate a communication protocol that
provides the time synchronization. Only one synchronization method can be active at
a time. IEEE 1588 v2 provides time master redundancy.
The merging unit supports IEEE 1588 v2 to update the real-time clock. IEEE 1588 v2
with GPS grandmaster clock provides the best accuracy ±1 µs.
The merging unit's 1588 time synchronization complies with the IEEE C37.238-2011
Power Profile, interoperable with IEEE 1588 v2. According to the power profile, the
frame format used is IEEE 802.3 Ethernet frames with 88F7 Ethertype as
communication service and the delay mechanism is P2P. PTP announce mode
determines the format of PTP announce frames sent by the merging unit when acting
Values (Range) Unit
0=None
1=Ok
3=Alarm
0=None
1=Ok
3=Alarm
0=None
1=Ok
3=Alarm
Section 3
Basic functions
Description
Status of programmable
LED 9
Status of programmable
LED 10
Status of programmable
LED 11
45