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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.
Single-phase load without VLOAD option
Single-phase load with VLOAD option
Load
voltmeter
input
Three-phase load without VLOAD option
Phase 1 line voltme-
ter input
I.VF_1
Control output value
Ou.P_1
Phase 2 line voltme-
ter input
I.VF_2
Control output value
Ou.P_2
Phase 3 line voltme-
ter input
I.VF_3
Control output value
Ou.P_3
*) with BIPHASE command the value Ld.V_3 is obtained as the average of the values Ld.V_1 and Ld.V_2
Line voltmeter input
I.VF
Control output value
Ou.P
Scale limits
L.tVL,
H.tVL
RMS
RMS
RMS
81901 "MSW_GPC-40/600A"_03-2021_ENG_page 26
The following diagrams show the processing sequences for
the initial voltage value.
Load voltage
RMS
Offset
Low-pass filter
o.tVL
Ft.tVL
Average
Ld.V
Load voltage
Ld.V
Load voltage
Ld.V_1
Load voltage
Ld.V_2
Load voltage
Ld.V_3
Load voltage *
Ld.V.t
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