Mitsubishi Electric AE-SW Series Instruction Manual page 39

4.2.5 Accessory (Please contact us for special accessories other than the ones listed below.)
Inspection items
1. Closing coil (CC)
Shunt trip device (SHT)
2. Auxiliary switch (AX/HAX)
3. Motor charging device (MD)
4. Undervoltage trip device (UVT)
5. Safety shutter (SST)
6. Cell switch (CL)
7. Mechanical interlock (MI)
4.3 Inspection after circuit breaking
If the breaker interrupts off the overload current or short-circuit current, check the periodic inspection items listed in
section 4.2.
The breaker can be used again if criteria are met.
Do not close the breaker again until the cause of the accident is confirmed and removed.
When a large fault current is estimated to be interrupted, it is recommended to replace the breaker as soon as possible.
Until replacement, use the breaker but monitor for an abnormal temperature rise or other abnormalities.
Level of breaking current and the treatment methods are listed below for reference.
Level of breaking current
1. 6 times the rated current or less
(LTD, STD range)
2. 70% of the rated breaking current or less
(STD, INST range)
3. Large fault current close to the rated breaking
current
(Note) 1. As for the cause of tripping, the level of breaking current can be determined from the trip cause indicator LEDs of ETR.
2. If the level of the fault current cannot be estimated, handle as in point 3 in section 4.3.
Inspection methods
Operates fully and smoothly in the
Electric operation
rated voltage range.
Fully switched over by the
Conduction check on AXa and AXb
opening/closing of the breaker.
Electric operation Charging is fully completed within the speci ed
time period (5 sec.) and the applicable voltage.
(1)Closing is not available at 45% or less of the
Electric operation
(2)Tripping is available at 45% to 70% of the
(1)No broken parts
Drawout/insert operation
(2)Drawout/insert operation can be
(3)The shutter closes in the disconnect/drawout
Be sure to fully switch over to one of
Drawout/insert operation
"DISCONNECT," "TEST," or "CONNECT" position.
Gap between the tripping pin and the lever: 0.2 to 1.2 mm
Interlock function check
For other installation and adjustment procedures, refer to
the MI installation manual.
Level of damage to the breaker
(1)No abnormality is seen on the Appearance by a
visual check.
(2)Wear and soot soiling on main contacts are light.
(1)Soiling on the entire exhaust port, which is
caused by soot, etc., is visible.
(2)Main contacts and the arc-extinguishing
chamber are lightly damaged.
(1)Entire exhaust port is heavily soiled by soot, etc.
(2)Main contacts and the arc-extinguishing chamber
are heavily damaged.
Criteria
rated voltage, and available at 85% or more.
rated voltage.
performed smoothly.
position, and the main circuit junction is not visible.
The breaker can be used again.
For the life of the opening/closing operation at the
rated current, refer to section 1.2.
The breaker can be used again.
The breaker can be used again if criteria in section
4.2 are met.
(1)Immediately replacement is recommended.
(2)If immediately replacement is not possible, use it
carefully at the reduced rated current on the
condition that criteria in section 4.2 are met.
As an additional test, perform the withstand voltage
test on the live parts of the breaker's main circuit at
twice the rated insulation voltage, which is 2000 V,
and no abnormality should be found.
However, replace it soon.
Treatment
If any abnormality is seen in the operation,
contact your local branch of ce or agency.
If any abnormality is seen in the operation,
contact your local branch of ce or agency.
If any abnormality is seen in the operation,
contact your local branch of ce or agency.
If any abnormality is seen in the operation,
contact your local branch of ce or agency.
If a broken part is found, contact your local
branch of ce or agency.
① If the drawout/insert operation is blocked
by a broken piece, remove the piece.
② If the drawout/insert operation cannot be performed,
contact your local branch of ce or agency.
If the shutter does not shut, contact your
local branch of ce or agency.
If any abnormality is seen in the operation,
contact your local branch of ce or agency.
If adjustment is not possible, contact your
local branch of ce or agency.
Treatment
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