gefran GPC - Analog Input Process Value; Measuring Load Current

81901A “MSW_GPC-40/600A”_03-2021_ENG_page 21
3.7.7. Analog input process value
Address
Format
GPC-OP
menu
Acronym
Global / M/E1/E2
GF_eXpress menu
Attribute Retentive Type Unit of mea- surement Default
Single-
node
Multi-
node
Description
1596 572 16 bit 04.01.01 In.A1 Global
MainMenu → Global → Status → In.A1
R
Float
(####.#)
s.p.
1860 836 16 bit 04.01.02 In.A2 Global
MainMenu → Global → Status → In.A1
R
Float
(####.#)
s.p.
1867 843 16 bit 04.01.03 In.A3 Global
MainMenu → Global → Status → In.A1
R
Float
(####.#)
s.p.
The parameter shows the process value of analog input A1 or A2 or A3.
min...max: 0.0...100.0
3.8. Measuring load current
The Advanced Power Controller is able to measure the
current input from the controlled load, whether single-phase
or three-phase. The current input of a two-phase load can
also be measured.
The absolute current input value read is processed to ob-
tain an RMS current value useful for controlling the applica-
tion.
The RMS current value can be read in the variable Ld.A
of the individual module (each module corresponds to a
single-phase load).
For three-phase loads, which use 3 modules (M = line L1,
E1 = line L2, E2 = line L3), the average of the Ld.A variables
of the individual modules is taken and stored in the variable
Ld.A.t.
Input measurement accuracy is better than 1% in start
modes ZC, BF and HSC.
In PA mode the accuracy is better than 3% with a conduc-
tion angle >90° and better than 10% for smaller conduction
angles.
The circulating current in the load is acquired with a 0.2 ms
sampling time.
If diagnostics detects a fault condition on the load, the red
ER LED will flash in synch with the yellow O1, O2 or O3
LED for the module in question.
The default value of the H.tA maximum limit or ammeter
full-scale depends on the controller model:
GPC model Rated current H.tA
GPC 40 40 A 80.0
GPC 60 60 A 120.0
GPC 100 100 A 200.0
GPC 150 150 A 300.0
GPC 200 200 A 400.0
GPC 250 250 A 500.0
GPC 300 300 A 600.0
GPC 400 400 A 800.0
GPC 500 500 A 1000.0
GPC 600 600 A 1200.0
External CT r.tA = 200 1000.0
The following diagrams show the processing sequences for
the initial current value.