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6.4.4
AC Input Circuits
This test can be performed by applying known values of voltage and current 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 6.4.2. A three-phase voltage source and a single-phase
current source are required.
Three-phase
voltage
source
A
Single-phase
current
source
+
DC
power
−
supply
• Check that the metering data is set to be expressed as secondary values on the "Metering switch"
screen.
"Settings" sub-menu → "Status" screen → "Metering switch" screen
If the setting is "Display Value = Primary", change the setting in the "Metering switch".
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
(*) : This connection is added for Model 200 and 400 series.
Figure 6.4.2 Testing AC Input Circuit
⎯
⎯
252
GRD150
V
TB 1
-11
-12
-13
-14
-15
-16
-17
φ
-18
TB1
-1
-2
-3
-4
-5
-6
-7
-8
-9
(*)
-10
TB4
-18
-19
-20
(E)
6 F 2 S 0 8 4 2
V a
V b
V c
V e or V s
I a
I b
I c
I e
I se
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