YASKAWA YASNAC XRC - Page 367

8.8 Open Phase Check
8-7
8.8
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: 200-220V (+10%, -15%))
Circuit Breaker (QF1)
Check
Turn on the control power supply and check the open phase volt-
age of “U,V,W” of the circuit breaker (QF1) with an electric tester.
If abnormal, replace the circuit breaker (QF1).
R
S
T
UV
W
R
S
T
U
V
W
CIRCUIT
BREAKER
(QF1)
CONTACTER
(1KM)
CONVERTER
Input 200/220VAC