Omron NX-PA Series User Manual page 143

Periodic Inspection Items
Inspec-
No.
tion item
1 External
power
supply
2 I/O power
supply
3 Ambient
environ-
ment
4 Installa-
tion and
wiring
NX-series CPU Unit Hardware User's Manual (W535)
Inspection details
Check for voltage fluctua-
tions at the power supply ter-
minals.
Check for voltage fluctua-
tions at the I/O terminals.
Check the ambient tempera-
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.
Check that each Unit is con-
nected and locked to the next
Unit securely.
Check that cable connectors
are fully inserted and locked.
Check for loose screws in
external wiring.
Check crimp connectors in
external wiring.
Check for damaged external
wiring cables.
6 Inspection and Maintenance
Criteria
The voltage must be Use a voltage tester to check the
within the allowable power supply at the terminals. Take
voltage fluctuation necessary steps to bring voltage of
range. the supplied power to within the
allowable voltage fluctuation range.
Voltages must be within Use a voltage tester to check the I/O
specifications for each power supply at the terminals. Take
Unit. necessary steps to bring voltage
fluctuations within limits.
0 to 55°C Use a thermometer to check the
temperature and ensure that the
ambient temperature remains within
the allowed range of 0 to 55°C.
Relative humidity must Use a hygrometer to check the
be 10% to 95% with no humidity and ensure that the ambi-
condensation. ent operating humidity remains
between 10% and 95%.
Make sure that condensation does
not occur due to rapid changes in
temperature.
Not in direct sunlight Protect the Controller if necessary.
No accumulation Clean and protect the Controller if
necessary.
No spray Clean and protect the Controller if
necessary.
No corrosive or flam- Check by smell or use a gas sensor.
mable gases
Vibration resistance Install cushioning or shock absorb-
and shock resistance ing equipment if necessary.
must be within specifi-
cations.
No significant noise Either separate the Controller and
sources noise source or protect the Control-
ler.
No looseness Press the connectors together com-
pletely and lock them with the slid-
ers.
No looseness Correct any improperly installed
connectors.
No looseness Tighten loose screws with a Phil-
lips-head screwdriver.
Adequate spacing Check visually and adjust if neces-
between connectors sary.
No visible damage Check visually and replace cables if
necessary.
Correction
6 - 3
6