Mitsubishi Electric AE-SW Series Instruction Manual page 37

Type and condition
Defect/Probable cause
of abnormality
6.Abnormality Electron-
ic Trip Relay (ETR)
(1)Trip unnecessarily 1.Tripped at rated current or less
2.Tripped at starting of load
3.By Noise/Surge
1.The breaker does not trip even when an
(2)Abnormal char-
over current flows.
acteristics
2.The characteristics is abnormality. (By field
test device)
1.The trip indicator LED or alarm contact
(3)Abnormalities of
output does not work.
Indication func-
2.The display (DP1, DP2) does not function.
tion or contact
output
3.The ERR. LED lit up.
4.The RUN LED does not light up.
5.The display key operation is not possible.
1.The drawout handle cannot be inserted.
7 . D rawo u t / i n s e r t i o n
operation is not
possible.
2.The lock plate cannot be pushed in.
3.The lock plate does not come out at the
"TEST" or "CONNECT" position.
4.The stopper pin has broken and although
the lock plate protrudes out at the "TEST"
and "CONNECT" position, the insertion
operation does not lock.
5.The indication on the drawout indicator
does not change.
6.The drawout handle does not turn.
7.The junction is broken and is impairing the
drawout/insertion operation.
8.The control circuit terminal is broken and is
impairing the drawout/insertion operation.
9.ACB body fails to be inserted into the cradle.
ACB body stops in the middle during
drawout/insertion operation.
8.The safety shutter 1.The barrier of the safety shutter (SST) is
(SST) does not op- broken.
erate. 2.The rod of the safety shutter (SST) unit is
broken.
1.The molding of the control circuit terminal is
9.The control circuit termi-
nal does not make con- broken.
tact at the "TEST" and 2.The blade of the automatic connection
"CONNECT" positions. terminal is deformed.
10.The UVT does not 1.Applied voltage is too low. (Or applied
draw in (abnormality voltage is too high.)
in the UVT control-
2.The applied voltage capacity is insufficient.
ler).
3.The trip terminals, DT1 and DT2, are
opened.
11.The auxiliary switch 1.Breakage of the operating parts of the
auxiliary switch
does not operate.
Investigation/Primary treatment
Check the load current and characteristics
setting of the ETR.
Check the characteristics by the field test
device.
Check the inrush current and STD/INST
setting of the ETR.
Please shift the setting of the ETR to upper
level (temporary use).
Please check connection of the frame
ground terminal "P4".
Check the load current and characteristics
setting of the ETR.
Check the characteristics by the field test
device.
Check about the field test device setting.
Check the control power supply, ERR. LED
and RUN LED.
Check the cable from the control circuit
terminal when using DP2.
Check the characteristics setting of the
ETR.
Check the breaker condition for lighting LED
(Refer to page 20).
Refer to separate instruction manual of
Display (DP1, DP2).
Insert the drawout handle after pushing the
OFF button.
Turn the drawout handle slightly to the right
and left and push in the lock plate at a position
where the lock plate can be pushed in easily.
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Please contact our company.
Please contact our company.
Push in the lock plate.
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Please contact our company.
Please contact our company.
Please contact our company.
Please contact our company.
Please contact our company.
Please contact our company.
Check the applied voltage, and adjust
applied voltage in accordance to rated
voltage of UVT controller.
Check the capacity of the voltage supply.
Check whether the trip terminals (DT1 and
DT2) are shorted.
In case of using the push button for trip, use
a b-contact type (normally closed button).
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Treatment
Secondary treatment
Please contact our company if there are any
abnormalities.
Please contact our company if there are any
abnormalities.
Reducing the noise/surge, or adding the
surge absorber
Please contact our company if there are any
abnormalities.
Please contact our company if there are any
abnormalities.
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Please contact our company.
(The other factor, refer to page 20)
Please contact our company.
Please contact our company.
Please contact our company if the drawout
handle cannot be inserted even when the
OFF button is pushed.
Please contact our company if the lock plate
cannot be pushed in.
Please contact our company.
Please contact our company.
Please contact our company.
Please contact our company.
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