Omron NT620S Operation Manual page 289

Inspection and Cleaning
Point Inspected
Power supply voltage
Ambient environmental
conditions
Mounting conditions
Components with limited
lives
Caution
Reference
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 NT620S/620C.
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
(NT620C)
Brightness of EL display unit
(NT620S)
- Be sure to switch the power OFF before replacement.
- Do not disassemble for repairs or modification. Otherwise, the product may
malfunction.
- The disposal of the NT620S/NT620C (and used backlights) may be regulated
by national and local authorities. Dispose of them in accordance with the laws
and regulations of the relevant country and local authority.
Cautions on replacing the NT620S/620C
When replacing the NT620S/620C after discovering a fault during inspections,
note the following points:
- After replacement, check that the new NT620S/620C is not subject to the same
error.
- 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 ad-
dress indicated on the back cover of this book.
Criterion
Permissible voltage fluctuation
range
(24 VDC –15% +10%)
0 to 45_C (NT620S)
0 to 40_C (NT620C)
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 10,000 hours in use.
Must be sufficiently bright.
EL display unit life:
Brightness is reduced by 30%
after about 30,000 hours in
use.
Section 7-4
Inspection Instrument
Tester
Thermometer
Hygrometer
Visual inspection
Accessory tools
Philips screwdriver
Visual inspection
Visual inspection
Visual inspection
279