Operation: CP1SD/T/L Version
66
CENTRON® Polyphase Meter Technical Reference Guide
SiteScan System and Installation Diagnostic Checks
The SiteScan on-site monitoring system has the ability to continuously monitor the site for
metering installation or tampering problems through the system and installation diagnostic
checks. The following software programmable diagnostic checks are available:
SiteScan Diagnostic #1
Cross-Phase, Polarity & Energy Flow Check—This diagnostic
verifies that all meter elements are sensing and receiving the
correct voltage and current angles for each phase of a specific
polyphase electric service. The limits are +/- 10 degrees for
voltage and +/- 90 degrees for current.
SiteScan Diagnostic #2
Phase Voltage Deviation Check—This diagnostic verifies that
each individual phase maintains an acceptable voltage level
with respect to the other phases. Problems such as shorted
potential transformer windings, incorrect phase voltage, and
loss of phase potential among others may be indicated.
SiteScan Diagnostic #3
Inactive Phase Current Check—This diagnostic verifies that
each individual current phase maintains an acceptable current
level. It may indicate problems such as current diversion and
open or shorted circuits, among others.
SiteScan Diagnostic #4
Phase Angle Displacement Check—Similar to Diagnostic 1,
but this diagnostic allows the user to define an acceptable
angle displacement between the phase voltage and current.
This diagnostic may indicate problems such as poor load
power factor conditions, poor system conditions, or
malfunctioning system equipment.
SiteScan Diagnostic #5
Current Waveform Distortion Check—This diagnostic detects
the presence of direct current (DC) on any of the phases of the
meter.
It is very important to note that the meter will continue to operate normally while any of the
diagnostic errors are being displayed. The system and installation diagnostic checks will
only report that there may be a problem with the site. They have no effect on metering or on
any operations performed by the CENTRON Polyphase meter.
If enabled, all the diagnostic checks will continually check for errors every five seconds.
The CENTRON Polyphase meter will not check for diagnostic errors under any of the
following conditions:
When single phase series conditions occur (Test Bench)
When the meter is in Test
Mode
When the diagnostic(s) have been disabled by the programming software
When auto service sense is configured the meter cannot determine the service type
