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6.9.1 Low Battery Charge
The unit’s battery charge level is indicated by D2 when the unit is in Status Mode (see section
6.8.3 for further details). If the unit is not sufficiently charged, then it will not successfully
complete its power up procedure when initially switched on.
The unit should be placed on charge with either the mains D.C. 12V power supply (supplied) or
by using a high current (1A or greater) USB charger (see section 7 for further details).
6.9.2 Lost Communications
If the unit has lost communications with the reference unit then a phase cannot be determined.
Lost communications with the Remote Reference Unit is indicated by the inner portion of the
three phase vectors lighting in turn and showing a rotating action.
6.9.3 No GPS Signal
If the unit has lost communications with the GPS Satellites, then the 1 second reference timing
pulse will not be available. In this situation, the unit will use its internal 1 second reference and
continue to provide a reference indication.
6.10 Reset Buttons
The PIU also has a single reset button as shown in Figure 6 below:
Figure 6 - PIU Reset Button
The reset is operated by pressing and holding down on the top surface of the button for 14
seconds.
NOTE: If the Main Processor Reset is operated then the PIU reference will be deleted and will
have to be set again before the PIU can be used to identify a phase.
Main Processor Reset