YASKAWA Motoman UP6 Instructions Manual page 107

3.8
Open Phase Check
Check Item
Lead Cable Check
Input Power Supply
Check
Disconnecting Switch
(QS1) Check
Open Phase Check List
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.
Check the open phase voltage of input power supply with an
electric tester.
(Normal value: 575/480/240V (+10%, -15%))
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).
575/480/240 VAC Input
R S
T
1
3 5
Disconnecting Switch
QS1
2 4
6
U V W
Transfomer (575-480-240V/208V)
T1
7 8 9
Circuit Protector
QF1
Power Supply Unit
1KM
Circuit Protector
QF2
Contents
Converter
L1 L2
3-7
3.8 Open Phase Check
L3