Schneider Electric PM5100 Manual De Usuario

Chapter 8—Measurements and calculations

PowerLogic™ PM5100 series user guide

Power factor min/max convention

The meter uses the following convention for power factor minimums and maximums:

•

For negative PF readings, the minimum PF value is the measurement closest to -0
for PF readings between -0 to -1. For positive PF readings, the minimum PF value is
the measurement closest to +1 for PF readings between +1 to +0.

•

For negative PF readings, the maximum PF value is the measurement closest to -1
for PF readings between -0 to -1. For positive PF readings, the maximum PF value
is the measurement closest to +0 for PF readings between +1 to +0.

Power factor sign convention

You can set the power factor sign (PF sign) convention by changing the HMI mode to
either IEC or IEEE.

IEC mode

In IEC mode, the PF sign follows the direction of power flow. PF sign is positive (+) for
positive (normal) power flow. PF sign is negative (-) for negative (reverse) power flow.

Power factor minimum and maximum

1.0

-0.4

-0.6

-0.8

-0

-0.2

-1.0

Maximum PF [ + ]

Negative PF values

[ - ]

Minimum PF [ - ]

Positive PF values

[ + ]

Power factor sign convention

Real
Power
In

watts negative (–)
vars positive (+)
power factor (–)

watts positive (+)
vars positive (+)
power factor (+)

watts negative (–)
vars negative (–)
power factor (–)

watts positive (+)
vars negative (–)
power factor (+)

Reverse
Power Flow

Normal

Power Flow

Reactive
Power In

Quadrant