Mitsubishi Electric AE-SW Series Instruction Manual page 41

Types and states
Faulty behaviors/estimated causes
of abnormality
1. It trips unnecessarily under normal load.
6. Electronic trip relay (ETR)
(1)It trips
unnecessarily.
2. It trips unnecessarily when the load is
started.
3. Unnecessary operation due to noise/surge
(2)Abnormality in 1. It does not trip with overcurrent.
operation
characteristics
2. The characteristic is not observed during
testing with a eld test device.
(3)Abnormality in
1. Trip cause LEDs and the pre-alarm
display functions
contact outputs are not working.
and contact
2. Display (DP1, DP2) does not operate.
outputs
3. ERR. LED is lit.
4. RUN LED does not turn on.
5. Keypad operation on the display is not available.
1. Drawout handle cannot be inserted.
7. Drawout/insert
operation can be
performed.
2. Drawout handle cannot be rotated.
3. The lock plate cannot be pressed in.
4. Lock plate does not get protruded at
"TEST" and "CONNECT" positions.
5. The lock plate is protruded at "TEST" and
"CONNECT" positions, but the drawout/insert
operation does not get locked.
6. Drawout position indicator does not change.
7. The main circuit junction is broken and
interrupting the drawout/insert operation.
8. The control circuit terminal block is broken
and interrupting the drawout/insert operation.
9. The breaker cannot be inserted.
The breaker stops in the middle of insertion.
Safety shutter (SST) barrier or unit rod is
8. Safety shutter (SST)
does not operate. broken.
9. Control circuit terminal
1. Mold of the control circuit terminal block is broken.
block is not conducted
at "TEST" or
"CONNECT" position. 2. Terminals of the control circuit terminal block are broken.
10. UVT does not
1. Applied voltage is too low
draw in.
(or too high).
(Abnormality in the
UVT controller)
2. Power supply capacity is not suf cient.
3. Trip terminal DT1 and DT2 are open.
11. Auxiliary switch
1. Abnormality in auxiliary switch parts
does not turn over.
(inside the breaker)
Investigation/primary treatment
Check that the load current and ETR are set
correctly.
Check the trip characteristic with a eld test
device.
If the INST and STD settings are overlapping
with the start inrush current, raise the settings.
Temporarily raise the setting values of ETR.
Connect the control power supply frame ground.
Check that the load current and ETR are set
correctly.
Check the trip characteristic with a eld test device.
Check the setting value of the eld test device.
Check that the control power supply is correctly
applied and check ERR. LED and RUN LED.
For DP2, check the wiring to DP2 from the
control circuit terminal block.
Setting check: Check if Ii is set to the "Do
not set" position.
Check the light up conditions (lit when the
control power supply is applied or when the
load current is 10% or more)
Check the instruction manual of the display again.
Insert the drawout handle while pressing
the OFF button.
Check if the lock plate is pushed in.
For AE4000-SW ~ AE6300-SW, check if the
xing bolts on both sides of the cradle are
released.
Slightly rotate the drawout handles to the right
and left, and push the lock plate into a position
where it goes in slightly.
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.
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.
Contact your local branch of ce or agency.
Check the applied voltage, and change the
applied voltage in accordance with the UVT
controller speci cations.
Check the power supply capacity.
Short-circuit between the trip terminal DT1
and DT2.
When using a push button switch for
tripping, check the push button switch.
Contact your local branch of ce or agency.
Treatment
Secondary treatment
If any abnormality is found
characteristics, contact your local branch
of ce or agency.
If any abnormality is found, contact your
local branch of ce or agency.
Suppress noise/surge sources.
noise/surge absorber.
If no abnormality is found on ETR and the
cause is unknown, contact your local
branch of ce or agency.
If any abnormality is found
characteristics, contact your local branch
of ce or agency.
If any abnormality is found, contact your
local branch of ce or agency.
Contact your local branch of ce or agency.
(For the causes, refer to P.21.)
Contact your local branch of ce or agency.
Contact your local branch of ce or agency.
If the drawout handle still cannot be inserted
while pressing the OFF button, contact your local
branch of ce or agency.
Contact your local branch of ce or agency.
If it cannot be pushed in, contact your local
branch of ce or agency.
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Contact your local branch of ce or agency.
Contact your local branch of ce or agency.
Contact your local branch of ce or agency.
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