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242
Inspection and Cleaning
Section 7-4
S
Points inspected
Inspect the following points to determine if there is any divergence from the
stated criteria. If there is, either improve the surrounding environment so that
the values fall within the stated range, or adjust the NT20S.
Point Inspected
Inspection Details
Criterion
Inspection Instrument
Power supply voltage
Fluctuation in power supply
terminal voltage
Permissible voltage fluctuation
range
(24 VDC –15% +10%)
Tester
Ambient environmental
conditions
Ambient temperature
(temperature in the operation
panel)
0 to 50
_
C
Thermometer
Ambient humidity
(humidity in the operation
panel)
35% to 85%RH
Hygrometer
Presence/absence of dust
Dust must not be settled
Visual inspection
Mounting conditions
Looseness of mounting
brackets etc.
To be no looseness
Accessory tools
Connector connections of
connecting cable
To be fully inserted and locked,
with no looseness
Looseness of screws in
external wiring
To be no looseness
Philips screwdriver
Conditions of external
connecting cables
Faults such as incipient
disconnections.
Visual inspection
Components with limited
lives
Brightness of the backlight
Must be sufficiently bright.
Backlight life:
Brightness is halved after
about 20,000 hours in use.
Visual inspection
Note:
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Do not attempt to disassemble the NT20S for repair or modification.
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The disposal of the NT20S (and used backlights) may be regulated by national
or local authorities. Dispose of them in accordance with the laws and regulations
of the relevant country and local authority.
Reference: When replacing the NT20S after discovering a fault during inspections, note the
following points:
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Be sure to switch the power OFF before replacement.
S
After replacement, check that the new NT20S is not subject to the same error.
S
If a faulty unit is returned for repairs, write as detailed a description of the fault as
possible and send this description together with the unit to the OMRON address
indicated on the back cover of this book.
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