Omron NT31 Operation Manuals page 648

Inspection and Cleaning
Point Inspected
Power supply Fluctuation in power supply terminal
voltage voltage
Ambient Ambient temperature (temperature in the
environmental environmental operation panel)
conditions
Ambient humidity (humidity in the
operation panel)
Presence/absence of dust
Mounting Looseness of mounting brackets, etc.
conditions
Connector connections of connecting
cable
Looseness of screws in external wiring
Conditions of external connecting cables Faults such as incipient disconnection
Components Brightness of the backlight
with limited
lives
Note
Reference: Desire on replacing the NT31/NT31C
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 NT31/NT31C, for example by
re-tightening screws.
Inspection Details
- Do not disassemble for repairs or modification.
- The disposal of the unit (including batteries to be disposed and backlight) 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.
When replacing the NT31/NT31C after discovering a fault during inspections,
note the following points:
- Be sure to switch the power OFF before starting replacement.
- After replacement, check that the new NT31/NT31C 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 address
indicated on the back cover of this book.
Criterion
Permissible voltage fluctuation range
(24 VDC −15% to +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
Must be sufficiently bright.
Backlight life:
Brightness is halved after about 25,000
hours in use at medium brightness, or
about 10,000 hours in use at high
brightness.
Section 11-4
Inspection
Instrument
Tester
Thermometer
Hygrometer
Visual inspection
Philips screwdriver
Philips screwdriver
Philips screwdriver
Visual inspection
Visual inspection
637