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6.4.4
AC Input Circuits
This test can be performed by applying known values of voltages and currents to the AC input
circuits and verifying that the values applied coincide with the values displayed on the LCD
screen.
The testing circuit is shown in Figure 6.4.4.1. A three-phase voltage source and a single-phase
current source are required.
Three-phase
voltage
source
Single-phase
current
source
+
DC
power
−
supply
• Check that the metering data is set to be expressed as secondary values (Display value = 2) on
the "Metering" screen.
"Setting (view)" sub-menu → "Status" screen → "Metering" screen
If the setting is Primary (Display value = 1), change the setting in the "Setting (change)"
sub-menu. Remember to reset it to the initial setting after the test is finished.
• Open the "Metering" screen in the "Status" sub-menu.
"Status" sub-menu → "Metering" screen
• Apply AC rated voltages and currents and check that the displayed values are within ± 5% of
the input values.
V
V
φ
φ
A
Figure 6.4.4.1 Testing AC Input Circuit
⎯ 191 ⎯
GRL100
V
TB1
-11
-12
-13
-14
φ
TB1
-1
-2
-3
-4
-5
-6
-7
-8
TB4
-A16
-A17
E
6 F 2 S 0 8 3 5
V a
V b
V c
I a
I b
I c
3I o
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