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10 Maintenance and Inspections
NX-series Communications Interface Units User’s Manual (W540)
10-1 Cleaning and Inspections
10
10-1-2 Periodic Inspection
Periodic Inspection Items
No. Item Inspection Criteria Correction
1 External
power
supplies
Measure the power supply
vol
tage at the terminal
blocks, and make sure that
they are within the criteria
voltage.
The voltage must be
withi
n the power supply
voltage range.
Use a voltage tester to check the
pow
er supply at the terminals. Take
necessary steps to bring voltage of
the supplied power to within the
power supply voltage range.
2 Ambient
en
viron-
ment
Check that the ambient oper-
ating temperature is within
the criteria.
0 to 55°C Use a thermometer to check the
te
mperature and ensure that the
ambient temperature remains within
the allowed range of 0 to 55°C.
Check that the ambient oper-
ating humidity is within the
criteria
.
10% to 95%
With no condensation.
Use a hygrometer to check the
humid
ity
and ensure that the ambi-
ent humidity remains between 10%
and
9
5%.
Make sure that condensation does
not occur due to rapid changes in
temperature.
Check that the CIF Unit is not
in
d
irect sunlight.
Not in direct sunlight Protect the CIF Unit if necessary.
Check for accumulation of
dirt, dust, salt, or metal pow-
der.
No accumulation Clean and protect the CIF Unit if
nece
ssary.
Check for water, oil, or chem-
ical sprays hitting the CIF
Un
it.
No spray Cle
an and protect the CIF Unit if
nece
s
sary.
Check for corrosive or flam-
mable gases in the area of
the CIF Uni
t
.
No corrosive or flam-
mable gases
Check by smell or use a gas sensor.
Check that the CIF Unit is not
subj
ect to direct vibration or
shock.
Vibration and shock
mu
st be within specifi-
cations.
Install cushioning or shock absorb-
ing equipment if necessary.
Check for noise sources
ne
arby th
e CIF Unit.
No significant noise
sources
Either separate the CIF Unit and
noise source or protect the CIF Unit.
3 Installa-
tion and
wirin
g
Check that the DIN Track
mou
n
ting hooks on all NX
Units are securely locked.
No looseness Securely lock all DIN Track mount-
ing hooks.
Check that cable connectors
are
full
y inserted and locked.
No looseness Correct any improperly installed
connectors.
Check that the screws on the
End Plates (PFP-M) are tight.
No looseness Tighten loose screws with a Phillips
screwdriver.
Check that each NX Unit is
connected along the hookup
guides, and fully inserted
until it contacts the DIN
Track.
The NX Units must be
conn
ected and
securely in place on the
DIN Track.
Connect each NX Unit along the
hoo
kup guides, and insert each NX
Unit until it contacts the DIN Track.
Check for damaged external
wiri
ng cables.
No visible damage Check visually and replace cables if
necessary.
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