3.8 Open Phase Check
3-7
3.8
Open Phase Check
Open Phase Check List
Check Item Contents
Lead Cable Check Confirm if the lead cable for the power supply is wired as shown
in the following. If the wiring is wrong or broken, repair it.
Input Power Supply
Check
Check the open phase voltage of input power supply with an
electric tester.
(Normal value: 575/480/240V (+10%, -15%))
Disconnecting Switch
(QS1) Check
Turn on the control power supply and check the open phase volt-
age of “U,V,W” of the disconnecting switch (QS1) with an electric
tester. If abnormal, replace the disconnecting switch (QS1).
Converter
R
S
T
UV W
Circuit Protector
QF1
1KM
575/480/240 VAC Input
UVW
24
6
1
35
Disconnecting Switch
QS1
Power Supply Unit
L1 L2 L3
Transfomer (575-480-240V/208V)
T1
Circuit Protector
QF2
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