Schneider Electric PM820 Energy Readings, Accumulated Energy, Conditional, Reactive Energy

63230-500-225A2	PowerLogicTM Series 800 Power Meter
3/2011	Chapter 4—Metering Capabilities

Energy Readings

The power meter calculates and stores accumulated energy values for real and reactive energy (kWh and kVARh) both into and out of the load, and also accumulates absolute apparent energy. Table 4–3lists the energy values the power meter can accumulate.

Table 4–3: Energy Readings

Energy Reading, 3-Phase Reportable Range Shown on the Display

Accumulated Energy

Real (Signed/Absolute)

Reactive (Signed/Absolute)

Real (In)

Real (Out)

Reactive (In)

Reactive (Out)

Apparent

-9,999,999,999,999,999 to 9,999,999,999,999,999 Wh

-9,999,999,999,999,999 to 9,999,999,999,999,999 VARh

0 to 9,999,999,999,999,999 Wh

0 to 9,999,999,999,999,999 Wh

0 to 9,999,999,999,999,999 VARh

0 to 9,999,999,999,999,999 VARh

0 to 9,999,999,999,999,999 VAh

0000.000 kWh to 99,999.99 MWh

and

0000.000 to 99,999.99 MVARh

Accumulated Energy, Conditional

Real (In)

Real (Out)

Reactive (In)

Reactive (Out)

Apparent

0 to 9,999,999,999,999,999 Wh

0 to 9,999,999,999,999,999 Wh

0 to 9,999,999,999,999,999 VARh

0 to 9,999,999,999,999,999 VARh

0 to 9,999,999,999,999,999 VAh

These values not shown on the display. Readings are obtained only through the communications link.

Accumulated Energy, Incremental

Real (In)

Real (Out)

Reactive (In)

Reactive (Out)

Apparent

0 to 999,999,999,999 Wh

0 to 999,999,999,999 Wh

0 to 999,999,999,999 VARh

0 to 999,999,999,999 VARh

0 to 999,999,999,999 VAh

These values not shown on the display. Readings are obtained only through the communications link.

Reactive Energy

Quadrant 1

Quadrant 2

Quadrant 3

Quadrant 4

0 to 999,999,999,999 VARh

0 to 999,999,999,999 VARh

0 to 999,999,999,999 VARh

0 to 999,999,999,999 VARh

These values not shown on the display. Readings are obtained only through the communications link.

➀Not shown on the power meter display.

The power meter can accumulate the energy values shown in Table 4–3in one of two modes: signed or unsigned (absolute). In signed mode, the power meter considers the direction of power flow, allowing the magnitude of accumulated energy to increase and decrease. In unsigned mode, the power meter accumulates energy as a positive value, regardless of the direction of power flow. In other words, the energy value increases, even during reverse power flow. The default accumulation mode is unsigned.

You can view accumulated energy from the display. The resolution of the energy value will automatically change through the range of 000.000 kWh to 000,000 MWh (000.000 kVAh to 000,000 MVARh), or it can be fixed. See Appendix C—Using the Command Interface on page 83 for the contents of the registers.

For conditional accumulated energy readings, you can set the real, reactive, and apparent energy accumulation to OFF or ON when a particular condition occurs. You can do this over the communications link using a command, or from a digital input change. For example, you may want to track accumulated energy values during a particular process that is controlled by a PLC. The power meter stores the date and time of the last reset of conditional energy in non-volatile memory.

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