Omron NT20S Operation Manual page 261

Inspection and Cleaning
Point Inspected
Power supply voltage
Ambient environmental
conditions
Mounting conditions
Components with limited
lives
Reference: When replacing the NT20S after discovering a fault during inspections, note the
242
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.
Inspection Details
Fluctuation in power supply
terminal voltage
Ambient temperature
(temperature in the operation
panel)
Ambient humidity
(humidity in the operation
panel)
Presence/absence of dust
Looseness of mounting
brackets etc.
Connector connections of
connecting cable
Looseness of screws in
external wiring
Conditions of external
connecting cables
Brightness of the backlight
S Do not attempt to disassemble the NT20S for repair or modification.
Note:
S 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.
following points:
S 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.
Criterion
Permissible voltage fluctuation
range
(24 VDC –15% +10%)
0 to 50_C
35% to 85%RH
Dust must not be settled
To be no looseness
To be fully inserted and locked,
with no looseness
To be no looseness
Faults such as incipient
disconnections.
Must be sufficiently bright.
Backlight life:
Brightness is halved after
about 20,000 hours in use.
Section 7-4
Inspection Instrument
Tester
Thermometer
Hygrometer
Visual inspection
Accessory tools
Philips screwdriver
Visual inspection
Visual inspection