Omron CJ1W-MA - REV 10-2008, Operation Manual

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Inspection Section 13-1
13-1 Inspection
Perform daily or periodic inspections to make sure that the PCU continues
operating in its optimum condition.
13-2 Inspection Points
The main components of the PCU are semiconductors, which have a long
service life. These components may deteriorate faster, however, due to factors
such as the operating environment. Therefore, routine inspection is required.
The standard inspection schedule is once every six months to one year. More
frequent inspections may be advisable depending on the operating environ-
ment.
Maintain the inspection schedule once it has been set.
Routine Inspection Points
No. Inspection
point
Details Criteria Remarks
1 I/O Power Sup-
ply Measure the voltage varia-
tions at the I/O power supply
terminal block. Do they meet
the standards? 24 V DC:
21.6 to 26.4 V DC Using a voltage tester, check between
the terminals adjusting to make sure
that the power supply is within the
acceptable range.
2 Environment
conditions Is the ambient temperature
within the acceptable range?
(When used in a panel, the
ambient temperature of the
PCU inside the panel must be
checked.) 0 to 55
°
C Using a thermometer, check the ambi-
ent temperature inside the panel and
make sure that it is within the accept-
able range.
Is the ambient humidity
(humidity within panel) within
the acceptable range? (When
used in a panel, the ambient
humidity of the PCU inside the
panel must be checked.) 10% to 90% (with no con-
densation) Using a hygrometer, check the ambient
humidity inside the panel and make
sure that it is within the acceptable
range. In particular, check that there is
no condensation due to sudden
changes in temperature.
Is the PCU exposed to direct
sunlight? The PCU must not be
exposed to direct sun-
light. Shield the PCU from direct sunlight.
Is there any accumulation of
dust (including iron dust) or
salts? There must be none of
these present. Remove any accumulation of dust
(including iron dust) or salts and protect
the PCU against them.
Is the PCU exposed to any
sprays of water, oil, or chemi-
cals? The PCU must not be
exposed to any of these. Protect the PCU against water, oil, and
chemicals.
Is the PCU installed in a loca-
tion subject to corrosive or
flammable gases? The PCU must not be
exposed to any of these. Check for odors by smelling or using a
gas sensor.
Is the PCU installed in a loca-
tion subject to shock or vibra-
tion? The amount of shock or
vibration must be within
the acceptable ranges
given in the specifica-
tions. Install a cushion or other device to
reduce shock and vibration.
Is the PCU installed in a loca-
tion near any source of noise? There must be no noise. Remove the PCU from the noise
source or take countermeasures to
protect the PCU from noise.
3 Installation and
wiring Is the PCU securely
mounted? The mounting must not
be loose. Lock the sliders securely.
Are the cable connectors
properly inserted and locked? The mounting must not
be loose. Insert and lock all cable connectors
properly.
Are any external cables dis-
connected? There must be no exter-
nal abnormalities. Do a visual check and connect or
replace cables as required.