Figure 9: 4-Quadrant Display For Active And Reactive Power - WAGO 750-494 Series Manual

WAGO-I/O-SYSTEM 750
750-494 3-Phase Power Measurement Module
Jump of power factor LF from +1 to -1
The LF value can jump between +1 and -1 when reactive power is very low. This
behavior occurs because of digitization noise!
The 4-quadrant display appears as follows:

Figure 9: 4-Quadrant Display for Active and Reactive Power

The 4-quadrant display is also shown in WAGO- I/O-CHECK for the measured
value views "Overview", "Phase Lx" and "Power" in the dialog "3-phase power
measurement".
Phase Angle
The phase angle between voltage and current is calculated for each phase using
time-synchronous sampling. The phase angle is indicated in degrees.
Rotary Field Detection
The zero crossings of the voltage characteristics for the 3 phases are monitored by
rotary field detection. The direction of rotation of a motor or machine can only be
determined when the phase sequence L1-L2-L3 at the I/O module has been
connected the same as at the motor and when this corresponds to the provisions of
VDE 0530-8 or DIN EN 60034-8 with regard to "Terminal designations and
direction of rotation" (L1 at U-Motor, L2 at V-Motor, L3 at W-Motor).
Phase sequence L1-L2-L3 signals clockwise rotation, whereas a reversed phase
sequence will signal counter-clockwise rotation. Caution: It is not possible to
detect double reversing.
Manual
Version 1.2.0
Function Description 37