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7-4
Section
Inspection and Cleaning
279
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.
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 45
_
C (NT620S)
0 to 40
_
C (NT620C)
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
(NT620C)
Must be sufficiently bright.
Backlight life:
Brightness is halved after
about 10,000 hours in use.
Visual inspection
Brightness of EL display unit
(NT620S)
Must be sufficiently bright.
EL display unit life:
Brightness is reduced by 30%
after about 30,000 hours in
use.
Visual inspection
Caution
- 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.
Reference
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.
Содержание NT620C
Страница 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Страница 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
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Страница 326: ...Appendix K Option List 325 Battery 3G2A9 BAT08 This is a lithium battery used for memory backup...
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