AccuEnergy Acuvim II, User Manual

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appropriate PT to maintain the measurement accuracy of the meter. When
connecting using the star configuration wiring method, the PT's primary side
rated voltage should be equal to or close to the phase voltage of the system to
utilize the full range of the PT. When connecting using the delta configuration
wiring method, the PT's primary side rated voltage should be equal to or close
to the line voltage of the system. A fuse (typical 1A/250Vac) should be used in
the voltage input loop. The wire for voltage input is AWG16-12 or 1.3-2.0mm
2
.
Note: In no circumstance should the secondary of the PT be shorted. The
secondary of the PT should be grounded at one end. Please refer to the wiring
diagram section for further details.
Current Input
Current Transformers (CTs) are required in most engineering applications.
Typical current rating for the secondary side of the CT shall be 5A (standard)
or 1A (Optional), please refer to the ordering information appendix for further
details. CTs must be used if the system rated current is over 5A. The accuracy
of the CT should be better than 0.5% with rating over 3VA is recommended in
order to preserve the meter's accuracy. The wire between CTs and the meter
shall be as short as possible. The length of the wire have an effect on the
accuracy.
The wire size of current input is AWG15-10 or 1.5-2.5mm
2
.
Note: The secondary side of the CT should not be open circuit in any
circumstance when the power is on. There should not be any fuse or switch in
the CT loop. One end of the CT loop should be connected to the ground.
Vn Connection
Vn is the reference point of the Acuvim II series meter voltage input. Low wire
resistance helps improve the measurement accuracy. Different system wiring
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