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6.6 Setting the PIU to operate with Anti-Clockwise Phase Rotation
It may be required that the PIU is to be operated in an area, where the phase rotation is anti-
clockwise instead of clockwise. The PIU has the facility to be able to be set for this operation by
pressing and holding F3 whilst pressing F1 to power the PIU. Whilst in this mode of operation,
the green D1 LED will be permanently lit, indicating the anti-clockwise phase rotation operation.
Also, whilst in this mode, incrementing the phase referencing (Long F2 followed by a short F3),
will cause the reference to rotate in an anti-clockwise direction.
6.7 Measured Phase Indications
In this section, it is assumed that the reference phase of the PIU being used has been set (see
sections 6.4 and 6.5 for further details).
Place the unit as close as possible to the property or equipment where the single phase is being
determined. If the unit can identify the phase of the measured E-Field, then it will illuminate the
corresponding phase vector. If the E-Field is weak, the sensitivity of the PIU can be improved by
fitting the external E-Field probe (supplied).
For the user to be confident that the displayed vector is the correct phase, the displayed vector
must remain illuminated for a minimum of 10 seconds.
The single phase of the property or equipment supply has been identified and displayed.
Figure 5 - Phase Indication Vectors
6.8 Operating Modes
In order to provide additional information to the user, the PIU offers three Operating Modes,
User Mode, Engineering Mode and Status Mode.
The PIU will always power up into the User Mode. The mode can then be cycled by a short press
and release of the F3 button.
The different modes of operation do not change the PIU functionality but provide different
levels of information through its varying indications.
Phase Identified
E-Field Strength