DPMS XPQ Bedienungsanleitung PDF herunterladen (Seite 21)

POWER INSTRUMENTS

used. A fuse (typical 1A/250Vac) should be used in the voltage input loop. A PT

should be used to transform the high voltage into the measurement range of the

meter if it is used in a high voltage system. The wire gauge of the input voltage

should be AWG16~12 or 1.3~2.0mm

Note: In no circumstances should the PT secondary be shorted. The PT

secondary should be well grounded at one end.

Current Input

In a practical engineering application, CTs should be installed in the

measuring loop. Normally the CT secondary is 5A. 1A is possible as an option.

A CT accuracy over 0.5% (rating over 3VA) is recommended and it will inuence

the measuring accuracy. The wire between the CT and meter should be as short

as possible. The length of the wire may increase the error of the measurement.

CTs must be required for rated current over 5A.

The wire guage of the input current should be AWG15~10 or 1.5~2.5mm

Note: The CT loop should not be open in any circumstances when the power

is on. There should not be any fuse or switch in the CT loop and one end of the

CT loop should be connected to the ground.

Vn Connection

Vn is the reference point of meter input voltage. The lower the wire

resistance the lower the error.

Three phase wiring diagram

The DPMS XPQ can satisfy most kinds of three phase wiring diagrams.

Please read this part carefully before you begin to do the wiring so that you may

chose a wiring diagram suitable for your power system.

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DPMS XPQ Bedienungsanleitung Seite 21