Chapter 10 Maintenance
10-
２
10.3 Periodic Inspection
Check the following items once or twice every six months, and perform the needed corrective actions.
Check Items Checking Methods Judgment Corrective Actions
Ambient
temperature
0 ~ 55 °C
Ambient Humidity 5 ~ 95%RH
Ambient
Environme
nt
Ambience
Measure with
thermometer and
hygrometer measure
corrosive gas
There should be no corrosive
gases
Adjust to general standard
(Internal environmental standard of
control section)
Looseness, Ingress
The module should be move the
unit
The module should be mounted
securely.
PLC
Conditions
dust or
foreign material
Visual check No dust or foreign material
Retighten screws
Loose terminal
screws
Re-tighten screws Screws should not be loose Retighten
Distance between
terminals
Visual check Proper clearance Correct
Connecting
conditions
Loose connectors Visual check
Connectors should not be
loose.
Retighten connector mounting
screws
Line voltage check
Measure voltage between input
terminals
*85 ~ 264V AC
*20~28V DC
Change supply power
Battery
Battery time and battery capacity
life indicated, Change the
reduction
Check total power failure If
battery capacity time and the
specified source
Battery capacity reduction should not
be indicated battery when specified
service life is exceeded
Fuse Visual check No melting disconnection
If fuse melting disconnection, change
the fuse periodically because a surge
current can cause heat
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