Chapter 11 Maintenance MASTER-K
11-3
11.3 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
temperature
0 to 55°C
Ambient
humidity
5 to 95% RH
Ambient
environment
Ambiance
Measure with
thermometer and
hygrometer Measure
corrosive gas
There should be no corrosive
gases
Looseness, play Move the unit
The module should be
mounted securely
PLC
conditions
Ingress of dust
or foreign
material
Visual check No dust or foreign material
Retighten screws
Loose terminal
screws
Retighten Screws should not be loose Retighten
Distance
between
solderless
terminals
Visual check Proper clearance Correct
Connecting conditions
Loose connector Visual check
Connectors should not be
loose
Retighten connector
mounting screws
Line voltage check
Measure voltage across
110/ 220 VAC terminal
85 to 132VAC
170 to 264VAC
Change supply power
Battery
Check battery
replacement time and
battery capacity
reduction
• Check total power failure
time and the specified source
life
• Battery capacity reduction
should not be indicated
If battery capacity
reduction is not
indicated, Change the
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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