Schneider Electric PM870 Manual De Usuario

© 2011 Schneider Electric. All Rights Reserved.

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 4–3 lists the energy values the power meter can accumulate.

The power meter can accumulate the energy values shown in Table 4–3 in 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.

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.

➀ Not shown on the power meter display.