Mitsubishi Electric MS-T Series, Instruction Manual

Page: 27 / 32

25
5. Recommended Update Interval
The recommended update timing for each device is 10 years or the specified number of switching times
listed in the catalog, etc.
This recommended update interval is not a value guaranteed in respect to the functions or performance.
Instead, it is an interval generally believed to be effective for replacing the part with a new part for economic
feasibility, and due to the deterioration of the device component’s materials when the product is used under
normal working conditions and the following maintenance and inspections are carried out.
6. Maintenance and Inspection Check List
Date:
Magnetic starter, contactor relay Write after inspecting
Class Inspection item Purpose Details of inspections Remarks Results
Abnormal
noise
Listen Abnormality
Generation of abnormal noise
(Abnormal noise caused by electromagnet
fault or damage, etc.) Per
panel
(all)
Abnormal
odor
Smell Abnormality Generation of abnormal odor
Per
panel
(all)
Contamina-
tion Existence of water or oil adherence or fault
caused by dust
Per
panel
(all)
Daily inspection Appear-
ance
Visual
Breakage
Existence of mold breakage, discoloration or
deformation
Per
panel
(all)
Clamp
screw
Visual Loosening Are any of the clamp screws loose? All
Metal
sections
Visual
Rusting,
corrosion
Is there any rust or corrosion? All
Periodic inspection (reference: every six months)
Move-
ment of
movable
sections
Manual
or
electric
Movement
fault Do movable sections move smoothly when
operated manually or electromagnetically?
All
The following section indicates the overview of the sampling tests for the items
requiring further inspection during the life margin estimation, daily inspection
and periodic inspection.
Contact
contamina-
tion
(1) Contact resistance measurement –
Existence of contact resistance
abnormality
Mechanism
friction (2) Operation test – Existence of operating
voltage abnormality
Layer short
circuit
(3) Coil characteristics test – resistance
value, current value, and existence of
abnormality Sampling
Contact
wear (4) Main dimension measurement – Is value
within tolerable value?
Contact
operation (5) Contact reliability test – Is value within
tolerable value? (reliability test)
Sampling
Detailed inspection
Life and
function
deteriora-
tion Test
(Test at
Mitsu-
bishi)
Life margin
(4) Coil life margin test
(high temperature continuity, surge test,
BDV pin hole test) Sampling