21.
21 - 2
MAINTENANCE AND INSPECTION
21.2 Periodic Inspection
Inspection on items shown below should be conducted once or twice every six months to a
year. Conduct the inspection when the equipment is moved or modified, or wiring is
changed.
Table 21.2 Periodic inspection
Item Check item Check method Judgement Action
1
Ambient environment
Ambient temperature
Measure with
temperature and
humidity gauge.
Measure presence of
corrosive gases.
0 to 55
When used in a panel,
temperature inside the
panel is the ambient
temperature.
Ambient humidity 10 to 90%RH
Atmosphere
There is no corrosive
gas present.
2 Line voltage check
100/200VAC,
24VDC, 110VDC
Measure voltage across
100/200VAC terminals.
85 to 132VAC
Change the power
supply.
170 to 264VAC
15.6 to 31.2VDC
85 to 140VDC
3Fuse
Check if the fuse is
blown.
(Preventive
maintenance)
Even if a fuse has not
blown, the element may
have deteriorated due to
inrush current, and the
fuse should therefore be
changed at regular
intervals.
4
Installation condition
Loosening, backlash
Test by moving the
module.
Must be installed solidly.
Retighten the screw.
For CPU module, I/O
module, and power
supply modules check
all connections.
Adhesion of dirt or
foreign matters
Visual inspection No adhesion. Remove and clean.
5
Connection conditions
Loosening of
terminal screw
Retighten with a
screwdriver.
No loosening. Retighten.
Proximity of
solderless terminals
Visual inspection
There is an appropriate
distance.
Correct the distance.
Loosening of
connector
Visual inspection No loosening.
Retighten the connector
fixing screw.
6Battery
Confirm SM51 or SM52
is OFF with a peripheral
device in the monitoring
mode.
(Preventive
maintenance)
Even when there is no
low-battery display,
replace if specified life is
exceeded.
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