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MELSEC-Q
10 MAINTENANCE AND INSPECTION
10.2 Periodic Inspection
The items that must be inspected one or two times every 6 months to 1 year are listed
below.
When the equipment is moved or modified, or layout of the wiring is changed, also
perform this inspection.
Periodic Inspection
Item Inspection Item Inspection Judgment Criteria Remedy
Ambient
temperature
0 to 55 °C
Ambient humidity 5 to 95 %RH 1
1
Ambient environment
Atmosphere
Measure with a thermometer
and a hygrometer.
Measure corrosive gas.
Corrosive gas must not be
present.
When the sequencer is
used in the board, the
ambient temperature in
the board becomes the
ambient temperature.
85 to 132VAC
170 to 264VAC
2 Power voltage
Measure a voltage across the
terminals of 100/200VAC and
24VDC.
15.6 to 31.2VDC
Change the power
supply.
Looseness, rattling
Move the module to check for
looseness and rattling.
The module must be installed
fixedly.
Further tighten screws.
If the CPU, I/O, or power
supply module is loose,
fix it with screws.
3
Installation
Adhesion of dirt and
foreign matter
Check visually.
Dirt and foreign matter must
not be present.
Remove and clean.
Looseness of
terminal screws
Try to further tighten screws
with a screwdriver.
Screws must not be loose. Further tighten.
Proximity of
solderless terminals
to each other
Check visually.
Solderless terminals must be
positioned at proper intervals.
Correct.
4
Connection
Looseness of
connectors
Check visually. Connectors must not be loose.
Further tighten connector
fixing screws.
5 Battery
check on the monitor mode of
the GX Developer that SM51 or
SM52 is turned OFF.
(Preventive maintenance)
Even if the lowering of a
battery capacity is not
shown, replace the
battery with a new one if
a specified service life of
the battery is exceeded.
1 When AnS Series Module is included in the system, the judgement criteria will be from 10 to 90 % RH.