Mitsubishi Electric AE-SW Series Instruction Manual page 36

5. Fault Diagnosis
Type and condition
of abnormality
1.Cannot close. 1.The closing operation cannot be performed.
(1) The OFF-lock device (CYL,CAL,Padlock)
is not released.
(2) The drawout position is not appropriate.
(3) The drawout handle is inserted.
(4) Voltage is not applied to the UVT.
(5) The closing spring is not charged.
(6) The closing coil does not operate.
(Manual closing operation can be performed.)
2.The closing operation is performed.
(1) Tripping (OFF) is performed simultaneously
with the closing operation.
(2) Turns OFF when charging after a closing
operation.
3.The ON button is broken.
4.The ON button cannot be pressed.
2.At the completion of External scheme (sequence)
charge, tripping per-
forms at the same
time.
3.OFF disabled. 1.The contact does not open even after
pushing the OFF button.
2. The SHT does not operate.
(Manual OFF operation can be performed.)
3.The OFF button cannot be pushed.
4. The OFF button is broken.
1.Cannot perform manual charging operation.
4.Charging disabled.
2.Electrical charging cannot be performed.
3.The motor turns but closing spring does not charge.
5.Unusual tempera- 1.The fastening of the connecting conductor
ture rise is loose.
2.The contact pressure flat spring of the
junction is damaged.
3.The contact resistance of the contact has
increased.
4.The wear of the contact is severe.
5.Over loaded.
(Note 1) When you drawout the breaker forcefully, do it after releasing higher breaker. Drawing out the breaker when it is energized may cause
serious accident.
E − 36
Defect/Probable cause
Release the OFF-lock device.
(CYL,CAL,Padlock)
Set to either of the "DISCONNECT",
"TEST" or the "CONNECT" positions.
Remove the drawout handle.
Apply voltage to the UVT.
Charging operation
1.If the voltage is not applied, examine the
2.In the case of voltage is applied, the
Please contact our company.
Please contact our company.
Please contact our company.
Please contact our company.
Please examine the external scheme (sequence).
(Note 1)
Please contact our company.
1.If the voltage is not applied, examine the
2.In the case of voltage applied, the breaker
Please contact our company.
Please contact our company.
Please contact our company.
1.Examine the power supply of control circuit.
2.Examine rated voltage.
Please contact our company.
Retighten.
Please contact our company.
Clean the contact surface (by using wire
brush).
Replace the ACB.
Check the load equipments.
Investigation/Primary treatment
control circuit.
breaker has some failure.
Please contact our company.
control circuit.
has some failure.
Please contact our company.
Treatment
Secondary treatment
Please contact our company if closing
cannot be performed even after completing
the primary treatment.
Refer to the section "Abnormalities of the
UVT" if there is an abnormality of the UVT.
1.Please contact our company if charging
cannot be performed manually.
2.Refer to the section "Charging disabled" if
electrical charging is not possible.
Please contact our company.
Faulty operating mechanism if the external
scheme has no trouble.
Please contact our company.
In the case of correct voltage is applied, the
breaker has some failure.
Please contact our company.
Please contact our company if discoloration of
the conductor or the terminal molding is noted.
Please contact our company
temperature does not fall even after
cleaning the contact surface.
if the