637
Inspection and Cleaning
Section 11-4
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 NT31/NT31C, for example by
re-tightening screws.
Point Inspected
Inspection Details
Criterion
Inspection
Instrument
Power supply
voltage
Fluctuation in power supply terminal
voltage
Permissible voltage fluctuation range
(24 VDC
−
15% to +10%)
Tester
Ambient
environmental
Ambient temperature (temperature in the
operation panel)
0 to 50
_
C
Thermometer
environmental
conditions
Ambient humidity (humidity in the
operation panel)
35% to 85% RH
Hygrometer
Presence/absence of dust
Dust must not be settled
Visual inspection
Mounting
Looseness of mounting brackets, etc.
To be no looseness
Philips screwdriver
conditions
Connector connections of connecting
cable
To be fully inserted and locked, with no
looseness
Philips screwdriver
Looseness of screws in external wiring
To be no looseness
Philips screwdriver
Conditions of external connecting cables
Faults such as incipient disconnection
Visual inspection
Components
with limited
lives
Brightness of the backlight
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.
Visual inspection
Note
- 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.
Reference: Desire on replacing the NT31/NT31C
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.
Summary of Contents for NT31 Series
Page 1: ...Cat No V043 E1 2 Programmable Terminal NT31 31C OPERATION MANUAL...
Page 2: ...iii NT31 31C Programmable Terminal Operation Manual Produced March 1999...
Page 41: ...30 Before Operating Section 1 5...
Page 75: ...64 Using a Memory Unit NT31 NT31C without V1 Section 3 6...
Page 160: ...149...
Page 174: ...163...
Page 193: ...182...
Page 211: ...200...
Page 235: ...224 c Return to the screen on which screens are specified...
Page 262: ...251...
Page 360: ...349 It is not possible to control a gloval window by touch switch operation...
Page 468: ...457 254 255 0 2 7 1 4 5 3 3 0 0 0 5 9 8 0 3...
Page 476: ...465 Special Functions Section 7 16...
Page 495: ...484 OFF...
Page 610: ...599 Commands Responses Section 9 3...
Page 630: ...619 Examples of Actual Applications of Memory Link Section 10 2...