6
120V Source
Rotary Switch
Phase to Ground Test
Phase to Phase Test
Polarity
Position
(Output Phase)
(Output Phase/Return Phase)
Correct
Standby
OFF
OFF
Correct
A
PHASE A
PHASE A to PHASE B
Correct
B
PHASE B
PHASE B to PHASE C
Correct
C
PHASE C
PHASE C to PHASE A
Reversed
Standby
OFF
OFF
Reversed
A
PHASE B
PHASE B to PHASE A
Reversed
B
PHASE C
PHASE C to PHASE B
Reversed
C
PHASE A
PHASE A to PHASE C
7. After the unit initializes, rotate the Selector Knob to Position A. The LCD will indicate
which phase the 120V AC voltage will be applied to.
8. Press and hold the AMMETER CLEAR button for several seconds. If there is any significant
current flow, the digital ammeter will display the current flow in 0.25Amp increments. If
there are no grounds connected to the phase either on the primary or secondary of a
transformer, and the phase indicated is not shorted to another, then the "NO FAULT"
message will be displayed:
A-ALIVE
NO FAULT DETECTED
Depending on the number of transformers connected to the network feeder during the
test, some small current (<0.3Amp) could be detectable due to the excitation currents of
the transformers. If the FACT-1 detects maximum current flow in the "live" (selected)
phase only, a phase to ground fault exists and is displayed:
A-ALIVE
PHASE A TO GND FAULT
If the FACT-1 detects maximum equal current in the output phase and the return phase,
then a phase-to-phase fault exists and is displayed:
B-ALIVE
PHASE B TO C FAULT
If the FACT-1 is operating with the transformer primaries connected to a feeder and a
ground is present on the secondary, the FACT-1 will detect its presence and display only
a partial reading. The actual reading obtained for a secondary fault will be dependent on
the windings of the transformer (turns-ratio) and the size (gauge) of the grounding
conductor. The heavier the grounding wire, the higher the current will be for secondary
faults. When secondary faults exist, they will be displayed as a phase-to-phase fault.
B-ALIVE
PHASE B TO C FAULT
