PhaseTrakker
AP30
Calibrating the Field Unit
19
When Calibration is complete, a summary screen is displayed. The Calibration
operation always sets the current Phase Shift setting to 0
°
. The Calibration op-
eration will fail if a Reference Unit is offline or there are network communication
problems. An unsuccessful Calibration should be repeated in an area with good
network communication with the Reference Unit(s) online.
If this is the first Calibration performed on the Field Unit on this system, confirm
the Phase Sequence setting by reading known phases B and C. If these are re-
versed, use the Phase Settings menu to change the Phase Sequence setting and
select the desired Phase Angle setting.
Deciding When to Calibrate Again
Calibration is easy and can be quickly performed whenever a known 0° phase is
available. Calibration is recommended in the following circumstances:
•
A different Hotstick Unit is being used with the Field Unit.
•
The Field Unit has moved more than 200 miles since the last time Cali-
bration was performed.
•
One of the configured Reference Units was not available at the last
Calibration. Calibrate again when the Reference Unit is back online.
•
A Reference Unit has been moved or is being powered by a different
reference phase.
•
The difference in phase timings measured at two locations a long dis-
tance apart can drift with changes in power flow on the grid. To mini-
mize the error caused by this drift, regular Calibration is recommended
for Field Units using Reference Units more than 200 miles away.
