E-Mon E-PS-S-HV-RTU - Manual (Page 84)

Chapter 5 Configuring the PowerSmart Socket PQM General Meter Setup
84 PowerSmart Socket Power Quality Meter
Using the IRIG-B
Select the GPS IRIG-B option and connect the GPS master
clock to the meter IRIG-B input. See the PowerSmart Socket
PQM Installation Manual for the connection diagram.
The PowerSmart Socket PQM automatically synchronizes its
clock with the GPS time each second, normally with accuracy
better than one millisecond if the time is locked to the GPS
satellite time. When the GPS clock loses the satellite, the
clock continues to generate the IRIG-B time code referenced
to the last available satellite time (called unlocked time), but
the time quality may get worse. Such losses may continue
from a few minutes to hours. The time code generated during
outages is typically accurate to within a few milliseconds over
a 24-hour period.
If the signal from the GPS master clock is not detected on the
meter input, the PowerSmart Socket PQM changes the time
synchronization source to the internal RTC in 10 minutes
after signal is lost. When the signal is restored, the meter
automatically acquires the GPS time.
Whenever the IRIG-B signal status or quality changes, the
corresponding event is automatically recorded to the device
Event log.
You can check the presence and quality of the IRIG-B signal
via the device diagnostics display (see
Device Diagnostics
Display in Chapter 3) or via Power Software (see Clearing
Device Diagnostics in Chapter 6).
Using SNTP
Enable SNTP client operation and configure it if required (see
Setting-Up SNTP Client ).
When an SNTP server is not available or when a connection
with a server is restored, the corresponding event is
automatically recorded to the device Event log.
Using Time Synchronization Pulses
Select one of the available digital inputs as either 1PPS, or
1PPM synchronization input.
The transition edge of an external pulse (open-to-close or
close-to-open transition depending on the selected pulse
polarity) adjusts the meter clock to the nearest whole second
for a 1PPS source, or to the nearest whole minute for a 1PPM
source. The time accuracy may be affected by the operation
delay of an external relay.