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Powering the PowerScout
3 and 18
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The PowerScout
instruments are self-powered from the L1 and L2 lines. When 80 – 340VAC or DC are put
across the L1 and L2 wires the three phasing LEDs will begin to flash in sequence. If the LEDs are all green then
the system power factor is greater than 0.55 and the CTs are properly placed on the corresponding voltage
phases.
If two or three of the LEDs are red then there is a phasing connection error. If two LEDs are red and one is
green. Switch the positions of the two CTs that are red. That should make all three LEDs green.
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Using PhaseChek
™
™
PhaseChek
(patent pending) is a unique feature of the PowerScout
and greatly simplifies installation and, at
a glance, verifies correct CT orientation during installation. The PowerScout automatically adjusts for CT
orientation—greatly reducing set-up time and all but eliminating installation errors.
™
If two or three of the PhaseChek
LEDs are red, then there is a phasing connection error. If two LEDs are red
and one is green, switch the positions of the two CTs that are red. That should make all three LEDs green.
™
If all three PhaseChek
LEDs are red, probably the CTs are connected in the correct order but off by one
position. For example, the L1 CT is on the L2 phase, the L2 CT is on the L3 phase and the L3 CT is on the L1
phase. Rotate the CTs until all of the LEDs are green thus ensuring a correct metering condition.
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You can also verify that your PowerScout
is set up correctly by using ViewPoint
. The ViewPoint
program is
™
designed to let you easily configure the PowerScout
for the current transformers connected to it and to check
™
readings. More information about ViewPoint
can be found in Section III of this manual.
Note: If the total system power factor is less than 0.55 the LEDs will be red even if connected properly. This
situation is rare but could occur if the load to be monitored is a lightly loaded electric motor, for example.
10
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