Is 3-phase
220V (60Hz), 380V
(50/60Hz), 415V (50Hz) measured at
power source box
RST ?
RSTlines are
broken or contact is
defective.
UVW
lines are broken
or contact is defective.
NO
YES
Is
3-phase 220V (60Hz),
380V (50/60Hz), 415V (50Hz)
measured at
RST
of MS1 or MS2
electromagnetic switch
primary
• Breaker is defective.
• Power source cord is
broken or contact is
defective.
Contract point of MS1
or MS2
electromagnetic
switch is defective.
Check motor and repair.
• Check operation electric
current (15A).
• Setting or OCR is defective if
it operates under the above
current.
NO
Check OCR operation
Abnormal
YES
Normal
OCR is defective.
NO
YES
Is
3-phase 220V
(60Hz), 380V (50/60Hz), 415V
(50Hz) measured at UVW of MS
1 or MS2
electromagnetic switch
secondary side?
NO
Is 3-phase
220V (60Hz), 380V
(50/60Hz), 415V (50Hz) at terminals
UVW
of
motor side?
NO
YES
YES
OCR operation indication lamp
lights.
Note: For re-operation push
manual reset button.
Note: Operate and check.
Are OCR terminals
and electrified?
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