Schneider Electric K series Bedienungsanleitung PDF herunterladen (Seite 40)

PM1000 Series Power Meters PLSED309039EN

Chapter 5 – Installation 08/2010

Voltage Signal Connections

For proper power meter operation, the voltage connection must be

maintained. The voltage must correspond to the correct terminal. The cable

required to terminate the voltage sense circuit should have an insulation

rating greater than 480 VAC and a current rating greater than 0.1 A.

There are four input voltage terminals marked V1, V2, V3, and Vn. See the

connection diagrams that follow, for details. For Delta connection, the Vn

terminal should be left unconnected.

PT Connections

The power meters directly accept LV voltage inputs of up to 480 VAC RMS

line to line (277 VLN). Voltages greater than this, typically HV systems,

must be connected through Potential transformers (PTs). The power meters

allow user programming of both PT primary and secondary voltages.

 User programmable PT primary range: 0.1 to 999 kVAC RMS LL

 User programmable PT secondary range: 80 to 481 VAC RMS LL

 Power meter voltage Input burden: 0.2 VA per input

NOTE: The PT primary and secondary values must be user programmed before using the

power meter. Otherwise, the readings will be wrong.

Selecting the voltage fuses

We strongly recommend using fuses on each of the sense voltages (except

for neutral) and the control / auxiliary power.

Table 5-4: Fuse recommendation

Power Source

Source voltage

Fuse (A)

Line voltage

80 to 600 VLL

0.25

Auxiliary supply (Control

power)

0.25

Current Signal Connections

The power meter accepts up to 6 A AC RMS per channel directly. Above

that, a current transformer must be interposed to scale down the current.

There are three pairs of current input terminals marked A1, A2, and A3.

Each pair of input terminals is labeled as S1, S2 and has an arrow indicating

the direction of current flow. For proper measurements, the phase

identification, and the polarity of the current signals must be correct. The

forward flow (import by consumer) current direction must be into the S1

terminal and the exit from the S2 terminal. Maintain the correct sequence

and polarity to avoid wrong readings.

Any unused current input terminals must be shorted together, e.g., in Delta

connection, the terminals A2 (S1, S2) must be shorted together. The shorted

terminals do not need to be grounded.

Install the wiring for the current circuit at 480 VAC insulation as a minimum.

The cable connection should be rated for 7.5 A or greater and have a cross-

sectional area of 2.5 mm

(14 AWG) minimum.

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