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(2) Periodic inspection
The following table lists the items that must be inspected one or two times every
half year to a year. When the equipment has been relocated or modified, or
wiring layout has been changed, perform this inspection.
Table 9.2 Periodic inspection
Item Inspection item Inspection contents Judgment criterion Measures
Ambient
temperature
0 to 55 °C
Ambient humidity 5 to 95% RH
*1
1
Ambient environment
Ambience
Measure the
temperature and
humidity with a
thermometer and a
hygrometer.
Measure corrosive gas.
Corrosive gas must not
be present.
When the
programmable
controller is used in the
board, the ambient
humidity in the board is
the ambient humidity.
85 to 132VAC
2
Power supply voltage
Measure the voltage
across the terminals of
100/200VAC.
170 to 264VAC
Change the power
supply.
Looseness, rattling
Move the module to
check for looseness and
rattling.
The module must be
installed securely.
Retighten the 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 the
dirt and foreign matter.
Looseness of
terminal screws
Retighten screws with a
screwdriver.
Screws must not be
loose.
Retighten the terminal
screws.
Distance between
solderless
terminals
Check visually.
The proper distance
must be provided
between solderless
terminals.
Set the proper distance.
4
Connection conditions
Looseness of
connectors
Check visually.
Connectors must not be
loose.
Retighten the connector
fixing screws.
5
Battery
Check that SM51 or
SM52 is turned off with
GX Works2.
(Preventive
maintenance)
Even if the lowering of a
battery capacity is not
displayed, replace the
battery with a new one i
f
the specified service life
of the battery is
exceeded.
6
Spare product
Install the product on
the actual
programmable
controller and check the
operation.
The operation must
meet the specifications.
Use the normal product
on the actual
programmable
controller as a spare
product.
7
Check the stored
program
Compare the stored
program with the
running program.
The two programs must
be identical.
Correct if any difference
is found.
8
Fan (heat exchanger)
filter
Rotation status
Rotation sound
Clogging
The fan must rotate
without abnormal
sounds.
The fan must rotate
without clogging.
Replace if any error is
found.
Clean.
9
Analog I/O
Check the offset/gain
value.
The value must be
identical with the
specifications (design
value).
Correct if any difference
is found.
*1: When AnS Series Module is used in the system, the judgment criteria will be from 10 to 90% RH.
9.3 Consumable Product
Backup batteries on programmable controllers are consumable products.