Inspection And Maintenance - Mitsubishi Electric AE-SW Series Instruction Manual

Inspection and Maintenance

1. Guidelines for Inspection and Maintenance .... 32
2. External view and Internal construction ..... 33
3. Preparation before Inspection ............... 33
The maintenance and inspection frequency and content are different depending on the working conditions. Read through the
following for details of sufficient maintenance and inspection requirements.
¡ The personnel having expertise concerned shall perform any maintenance/inspection. Note that there are the risk
of electrical shock.
¡ Any maintenance/inspections shall be performed after cutting off the master circuit-breaker and making sure that
there is no current flowing. Note that there are the risk of electrical shock.
If maintenance and/or inspection should be carried out without cutting of the power supply in an unavoidable cases, wear
rubber gloves and insulated boots laying rubber mat on the floor. Use insulated tools and instruments only. An access to the
live parts is necessary in this maintenance and inspection work, when workers' full attention should be paid to the insulation of
human body from the live parts.
Any normal opening/closing may be done safely because the live parts are covered with insulated molded case or the like.
1. Guidelines for Inspection and Maintenance
Inspection : ACBs are inspected to detect part that may be deteriorating at an early stage, to maintain the performance of the
ACB through timely renewal of consumable and deteriorating parts and to prevent accidents that could other-
wise arise as the breaker approaches the end of lifetime.
Maintenance : Maintenance is necessary in order to maintain the performance of the ACB at every two times of inspection, ex.
grease lubrication. Please contact to our service network.
1.1 Guidelines for Inspection and Replacement according to the period of use and the environment of usage
It is recommended that periodic inspections are performed about once a month commencing use thereafter according to the
guidelines for inspection, maintenance and renewal to ensure a stable, long-term use of the ACB.
Environments
1 Places with ever clear and dry air.
Reference
atmosphere
Indoor Where there is no corrosive gas and little
2
dust.
Places with little dust but with such gases as salty,
sulfurous acid, hydrogen sulfide, high matures.
1
Places average over 24hours of ambient air
Adverse
temperature exceed + 35°C.
environment
Locations with especially service corrosive gas
2 and dust conditions and where humans cannot
stay for a long period of time.
1.2 Guidelines for Inspection and Replacement according to the number of operating cycles
Number of
Model operating cycles
with rated current
∗
1
AE630-SW
AE1000-SW
AE1250-SW
500 cycles
AE1600-SW
AE2000-SWA
AE2000-SW
AE2500-SW 150 cycles
AE3200-SW every 100 cycles
AE4000-SWA every 50 cycles
AE4000-SW 3P
AE5000-SW 3P
AE6300-SW 3P
AE4000-SW 4P 100 cycles
AE5000-SW 4P
AE6300-SW 4P
∗
1 Operating cycles shall be regarded as being with rated current, even if the current is much less than the maximum rated current of the breaker.
∗
2 Guidances for maintenance is every 2000 cycles terms of the number of operating cycles for all models.
E − 32
Guidelines for inspection
Number of
Limit of number of operating cycles with rated current
operating cycles
without rated
With rated current
∗
current 2
every
every
2,000 cycles
every
every
1,000 cycles
every
every
500 cycles
4. Inspection Details .................................. 33
5. Fault Diagnosis ..................................... 36
CAUTION
Specific examples
Dustproof and air-conditioned
electrical rooms, etc.
Distribution panels in individual
electrical rooms that are not
dustproof and air-conditioned.
Geothermal power plants, waste
water treatment, steel miles, paper
factories, pulp factories, etc.
Chemical factories, quarries,
mining areas, etc.
Product performance
Without current
5,000 20,000
23,500
1,500
18,500
1,000 19,000
500 19,500
9,000
1,000
4,000
Guidances for Guidances for Guidances for
inspection maintenance replacement
Within approx.
15 years
Once every Once every
2 to 3 years 2 inspection
Within approx.
7 to 15 years
Once Once every
Within approx.
a year 2 years
3 to 7 years
Once every Once
Within approx.
half year a year
1 to 3 years
Limit of number of operating cycles
with overload
Number of
Total Current
operating cycles
25,000
6 times the rated
20,000
current
10,000
5,000
12 cycles
3 cycles