gefran GPC - Measuring Load Voltage

81901 “MSW_GPC-40/600A”_03-2021_ENG_page 26
Single-phase load without VLOAD option
Single-phase load with VLOAD option
3.9. Measuring load voltage
The Advanced Power Controller is able to measure the
RMS voltage value of the controlled load, whether sin-
gle-phase or three-phase. It can also measure the voltage
of a two-phase load.
In the absence of the VLOAD measurement option, the
RMS voltage value of the load is calculated from the line
voltage and power output values.
The following diagrams show the processing sequences for
the initial voltage value.
Load voltage
Ld.V
Scale limits
L.tVL,
H.tVL
Offset
o.tVL
Low-pass filter
Ft.tVL
Line voltmeter input
I.VF
Load voltage
Ld.V
Control output value
Ou.P
RMS
Phase 1 line voltme-
ter input
I.VF_1
Control output value
Ou.P_1
Phase 2 line voltme-
ter input
I.VF_2
Load voltage
Ld.V_1
Load voltage
Ld.V_2
Load voltage
Ld.V_3
Load voltage *
Ld.V.t
Control output value
Ou.P_2
Phase 3 line voltme-
ter input
I.VF_3
Control output value
Ou.P_3
RMS
RMS
Average
RMS
*) with BIPHASE command the value Ld.V_3 is obtained as the average of the values Ld.V_1 and Ld.V_2
Three-phase load without VLOAD option
Load
voltmeter
input