WAGO-I/O-SYSTEM 750 Function Description 37750-494 3-Phase Power Measurement ModuleManualVersion 1.2.0Jump of power factor LF from +1 to -1The LF value can jump between +1 and -1 when reactive power is very low. Thisbehavior occurs because of digitization noise!The 4-quadrant display appears as follows:Figure 9: 4-Quadrant Display for Active and Reactive PowerThe 4-quadrant display is also shown in WAGO- I/O-CHECK for the measuredvalue views "Overview", "Phase Lx" and "Power" in the dialog "3-phase powermeasurement".Phase AngleThe phase angle between voltage and current is calculated for each phase usingtime-synchronous sampling. The phase angle is indicated in degrees.Rotary Field DetectionThe zero crossings of the voltage characteristics for the 3 phases are monitored byrotary field detection. The direction of rotation of a motor or machine can only bedetermined when the phase sequence L1-L2-L3 at the I/O module has beenconnected the same as at the motor and when this corresponds to the provisions ofVDE 0530-8 or DIN EN 60034-8 with regard to "Terminal designations anddirection 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 phasesequence will signal counter-clockwise rotation. Caution: It is not possible todetect double reversing.
