E-Mon E-PS-S-HV-RTU - Manual (Page 19)

Chapter 2 Operating the
PowerSmart Socket PQM Meter Clock and Time Synchronization
PowerSmart Socket Power Quality Meter 19
Password-tampering events are automatically recorded to the
Event log file after every three unsuccessful login attempts in
5 minutes.
Meter Clock and Time Synchronization
Time synchronization provides a common time basis for the
meter billing and tariff system, and for the power quality and
fault recorders so that events and disturbances can be
compared to one another.
The PowerSmart Socket PQM can receive a time
synchronization signal either from a GPS satellite clock that
has an IRIG-B time code output, or from another device that
can provide 1PPS or 1PPM time synchronization pulses
through relay contacts.
The PowerSmart Socket PQM IRIG-B port uses unmodulated
(pulse-width coded) time code signal (unbalanced 5V level).
The PowerSmart Socket PQM also provides an SNTP client
that can receive precise time from an available SNTP server
via the Internet.
See Time Synchronization Source in Local Settings setup (see
Local Settings in Chapter 5) for more information on how to
select an external time synchronization source in your meter.
See Setting-Up SNTP Client in Chapter 5 on how to configure
the SNTP client.
Monitoring the Meter Battery
A backup lithium battery keeps the meter clock running when
the power is removed from the meter.
You can monitor the status of the battery from the front
display on the Device Info pages (see
Device Info Display in
Chapter 3) and via the device diagnostics.
When the lithium battery voltage drops below the minimum
allowed level, it is indicated by the blinking “Battery Low”
icon on the display and via the device diagnostics. In this
event, the battery should be checked and replaced if
required.
NOTE
Always clear the battery operation time counters after
replacing a battery. See
Reset of Accumulators and Log Files
in Chapter 6 for information on how to clear the operation
counters in your meter.
Billing and Energy Metering
The PowerSmart Socket PQM provides true four-quadrant
energy measurements with Class 0.2 ANSI C12.20 accuracy.
The
following energy quantities are available for
instrumentation and billing:
• kWh delivered (Q1+Q4)
• kWh received (Q2+Q3)