Name
Type
Values (Range)
Unit
Description
Programmable LED 8
Enum
0=None
1=Ok
3=Alarm
Status of programma-
ble LED 8
Programmable LED 9
Enum
0=None
1=Ok
3=Alarm
Status of programma-
ble LED 9
Programmable LED 10
Enum
0=None
1=Ok
3=Alarm
Status of programma-
ble LED 10
Programmable LED 11
Enum
0=None
1=Ok
3=Alarm
Status of programma-
ble LED 11
3.4
Time synchronization
3.4.1
Time master supervision GNRLLTMS
3.4.1.1
Function block
GNRLLTMS
ALARM
WARNI NG
EXCLKMSTR
Figure 19: Function block
3.4.1.2
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,
1MRS758407 C
Basic functions
SMU615
Technical Manual
51
Summary of Contents for Relion SMU615
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