Periodic Maintenance And Inspection; Periodic Inspection Points - Omron NJ501-1 Series User Manual

6 Inspection and Maintenance
6-1

Periodic Maintenance and Inspection

Daily or periodic inspections are required in order to maintain the Controller's functions in peak operat-
ing condition.
6-1-1 Periodic Inspection
Although the major components in NJ-series Controllers have an extremely long life time, they can
deteriorate 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 Controller is in a control
panel.)
Check the ambient humidity.
(Inside the control panel if
the Controller is in a control
panel.)
Check that the Controller is
not in direct sunlight.
Check for accumulation of
dirt, dust, salt, metal powder,
etc.
Check for water, oil, or chem-
ical sprays hitting the Con-
troller.
Check for corrosive or flam-
mable gases in the area of
the Controller.
Check the level of vibration
or shock.
Check for noise sources near
the Controller.
6-2
Inspection
The voltage must be within
the allowable voltage fluctua-
tion range.
85 to 264 VAC (+10%/15%)
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
No corrosive or flammable
gases
Vibration resistance and
shock resistance 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
I/O power supply at the terminals.
Take necessary steps to bring volt-
age 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 Controller if necessary.
Clean and protect the Controller if
necessary.
Clean and protect the Controller if
necessary.
Check by smell or use a sensor.
Install cushioning or shock absorb-
ing equipment if necessary.
Either separate the Controller and
noise source or protect the Control-
ler.
NJ-series CPU Unit Hardware User's Manual (W500)
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