Mitsubishi Electric AE-SW Series Instruction Manual page 40

5. Handling of abnormal operations
Types and states
Faulty behaviors/estimated causes
of abnormality
1. Closing operation cannot be performed.
1. Unable to close
(1)OFF locking device (CYL. CAL, Padlock)
is not released.
(2)Drawout position is inappropriate.
(3)Drawout handle is inserted.
(4)No voltage is applied to UVT.
(5)Closing springs are not charged.
(6)Closing coil does not operate.
(It closes by manual operation.)
2. Closing can be performed.
(1)It trips (OFF) at the same time as closing.
(2)It turns OFF when charging after closing.
3. ON button is broken.
4. Unable to push the ON button.
External sequence could be the cause.
2. Closing trip occurs
when the charging
is completed.
1. Unable to open (OFF) even by pressing
3. Unable to open
the OFF button.
2. SHT does not operate.
(It opens by manual operation.)
3. Unable to push the OFF button.
4. OFF button is broken.
4. Unable to charge 1. Manual charging is not possible.
2. Motor charging is unavailable.
3. Motor operates but it does not charge.
1. Connection of the conductors is loose.
5. Abnormal
temperature rise
2. Main circuit junction is broken.
3. Flowing current is large.
Note 1: When drawing out the breaker forcefully, do so after opening upper breakers.
If it is drawn out in the energized state, a major accident could occur.
E-40
Investigation/primary treatment
Release the OFF locking device (CYL. CAL,
Padlock).
Be sure to be at one of "DISCONNECT,"
"TEST," or "CONNECT" position.
Take out the drawout handle.
Apply voltage to UVT.
Charge.
1. When no voltage is applied, investigate
the operation circuit.
2. When a voltage is applied, check that the
connector on the control circuit terminal
block is securely inserted.
Contact your local branch of ce or agency.
Contact your local branch of ce or agency.
Contact your local branch of ce or agency.
Contact your local branch of ce or agency.
Investigate the external sequence.
Contact your local branch of ce or agency.
Note 1
1. When no voltage is applied, investigate
the operation circuit.
2. When voltage is applied, contact your
local branch of ce or agency.
Contact your local branch of ce or agency.
Contact your local branch of ce or agency.
Contact your local branch of ce or agency.
1. Check the power supply from the control circuit.
2. Check the applicable voltage.
Contact your local branch of ce or agency.
Fasten them at the speci ed torque.
Contact your local branch of ce or agency.
Lower the owing current.
Treatment
Secondary treatment
If closing is still unavailable after the rst
treatment, contact your local branch of ce
or agency.
When the UVT is faulty, refer to the section
of "UVT does not draw in."
1. If manual charging is unavailable, contact
your local branch of ce or agency.
2. If motor charging is unavailable, refer to the
section of "Motor charging is unavailable."
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Contact your local branch of ce or agency.
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Contact your local branch of ce or agency.
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If the motor does not operate even though
the correct voltage is applied, contact your
local branch of ce or agency.
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If discoloration of conductors and terminal mold is
seen, contact your local branch of ce or agency.
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