Recommended Update Interval; Maintenance And Inspection Check List - Mitsubishi Electric MS-T Series Instruction Manual

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

Magnetic starter, contactor relay
Class Inspection item
Abnormal
noise
Abnormal
odor
Appear-
ance
Clamp
screw
Metal
sections
Move-
ment of
movable
sections
Life and
function
deteriora-
tion
Purpose
Listen Abnormality
Smell Abnormality Generation of abnormal odor
Contamina-
tion
Visual
Breakage
Visual Loosening
Rusting,
Visual
corrosion
Manual
Movement
or
fault
electric
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
Mechanism
friction
Test
(Test at
Layer short
Mitsu-
circuit
bishi)
Contact
wear
Contact
operation
Life margin
Details of inspections
Generation of abnormal noise
(Abnormal noise caused by electromagnet
fault or damage, etc.)
Existence of water or oil adherence or fault
caused by dust
Existence of mold breakage, discoloration or
deformation
Are any of the clamp screws loose?
Is there any rust or corrosion?
Do movable sections move smoothly when
operated manually or electromagnetically?
(1) Contact resistance measurement –
Existence of contact resistance
abnormality
(2) Operation test – Existence of operating
voltage abnormality
(3) Coil characteristics test – resistance
value, current value, and existence of
abnormality
(4) Main dimension measurement – Is value
within tolerable value?
(5) Contact reliability test – Is value within
tolerable value? (reliability test)
(4) Coil life margin test
(high temperature continuity, surge test,
BDV pin hole test)
Date:
Write after inspecting
Remarks Results
Per
panel
(all)
Per
panel
(all)
Per
panel
(all)
Per
panel
(all)
All
All
All
Sampling
Sampling
Sampling
25