Inspections; Inspection Points - Omron CJ2 User Manual

7 Inspection and Maintenance
7-1

Inspections

Daily or periodic inspections are required in order to maintain the PLC's functions in peak operating
condition.
7-1-1

Inspection Points

Although the major components in CJ-series PLCs have an extremely long life time, they can deterio-
rate under improper environmental conditions. Periodic inspections are thus required to ensure that the
required conditions are being kept.
Inspection is recommended at least once every six months to a year, but more frequent inspections will
be necessary in adverse environments.
Take immediate steps to correct the situation if any of the conditions in the following table are not met.
Periodic Inspection Points
No. Item
1 Source Power Check for voltage fluctua-
Supply tions at the power supply ter-
minals.
2 I/O Power Supply Check for voltage fluctua-
tions at the I/O terminals.
3 Ambient environ- Check the ambient tempera-
ment ture. (Inside the control panel
if the PLC is in a control
panel.)
Check the ambient humidity.
(Inside the control panel if
the PLC is in a control
panel.)
Check that the PLC is not in
direct sunlight.
Check for accumulation of
dirt, dust, salt, metal filings,
etc.
Check for water, oil, or chem-
ical sprays hitting the PLC.
Check for corrosive or flam-
mable gases in the area of
the PLC.
Check the level of vibration
or shock.
Check for noise sources near
the PLC.
7-2
Inspection
The voltage must be within
the allowable voltage fluctua-
tion range.
Voltages must be within
specifications for each Unit.
0 to 55°C
Relative humidity must be
10% to 90% with no conden-
sation.
Not in direct sunlight
No accumulation
No spray on the PLC
No corrosive or flammable
gases
Vibration and shock must be
within specifications.
No significant noise sources
Criteria
Use a voltage tester to check the
power supply at the terminals. Take
necessary steps to bring voltage
fluctuations within limits.
Use a voltage tester to check the
power supply at the terminals. Take
necessary steps to bring voltage
fluctuations within limits.
Use a thermometer to check the
temperature and ensure that the
ambient temperature remains
within the allowed range of 0 to
55°C.
Use a hygrometer to check the
humidity and ensure that the ambi-
ent humidity remains between 10%
and 90%. Make sure that conden-
sation does not occur due to rapid
changes in temperature.
Protect the PLC if necessary.
Clean and protect the PLC if nec-
essary.
Clean and protect the PLC if nec-
essary.
Check by smell or use a sensor.
Install cushioning or shock absorb-
ing equipment if necessary.
Either separate the PLC and noise
source or protect the PLC.
CJ2 CPU Unit Hardware User's Manual
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