VAMP 59 - Page 120

3.6 System clock and
synchronization
3 Supporting functions
Technical description
120
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VM59.EN001
Example 1.
If there has been no external sync and the relay's clock is
leading sixty-one seconds a week and the parameter AAIntv
has been zero, the parameters are set as
sAAIntv
LeadAvDrft
9.9
61
8.604


With these parameter values the system clock corrects itself
with –1 ms every 9.9 seconds which equals 61.091 s/week.
Example 2.
If there is no external sync and the relay's clock has been
lagging five seconds in nine days and the AAIntv has been
9.9 s, leading, then the parameters are set as
6.10
3600249
5000
9.9
1
1




NEW
AAIntv
LeadAvDrft 
NOTE! When the internal time is roughly correct – deviation is less than four
seconds – any synchronizing or auto-adjust will never turn the clock
backwards. Instead, in case the clock is leading, it is softly slowed down
to maintain causality.
System clock parameters
Parameter
Value
Unit
Description
Note
Date
Current date
Set
Time
Current time
Set
Style
ydm
d.m.y
m/d/y
Date format
Year-Month-Day
Day.Month.Year
Month/Day/Year
Set
SyncDI



DI1, DI2
The digital input used for clock
synchronisation.
DI not used for synchronizing
Minute pulse input
***)
TZone
12.00 ...
+14.00
*)
UTC time zone for SNTP
synchronization.
Note: This is a decimal number.
For example for state of Nepal
the time zone 5:45 is given as
5.75
Set
DST
No
Yes
Daylight saving time for SNTP
Set