Precautions When Cleaning The Pt Screen; Maintenance And Inspection - Omron NT600M Series Operation Manual

Maintenance and Inspection

Inspection item
Power supply Measure at the power supply terminal block. Are
voltage fluctuations within the criterion?
Operating Is the ambient temperature (the temperature inside
environment of the panel) suitable?
Is the ambient humidity (the humidity inside of the
panel) suitable?
Is dust collecting?
Installation Is each Terminal firmly secured?
Are the connectors for the connecting cable inserted
perfectly and locked?
Are any screws for the external wiring coming loose? There should be no loose
Is any external wiring loose or disconnected?
Replaceable Can you read the characters on the liquid crystal
parts display?
Is the backlight illumination as bright as it should be?
Tools for Inspection
Measuring Instruments (Depending on Case)
Precautions for Handling
8-3-3

Precautions When Cleaning the PT Screen

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The standard inspection period is once every 6 to 12 months, but it should
be moved up if the operating environment is harsh. If there is any deviation
from the criterion, then it should be corrected.
Inspection content
Phillips and Flat-blade screwdrivers
Voltage tester or digital voltmeter
Industrial alcohol and all-cotton cloth
Synchroscope
Oscilloscope with pen output
Thermometer
Hydroscope
Turn off the power before replacing Terminals.
When you discover a defective Terminal and replace it, check again to be
sure that the problem was actually with the Terminal.
When returning a defective Terminal for service, please describe the prob-
lem in as much detail as possible. Send the Terminal to the OMRON offices
closest to you.
If the NT600M screen gets dirty, it will become hard to read. Be careful of the
following points when cleaning it.
When cleaning, wipe with a dry, soft cloth. If the dirt does not come off, then
moisten the rag with water and rub hard.
Wiping with a chemical cloth or with volatile solutions such as benzine or
thinner may cause degeneration. A little alcohol may be used if necessary.
Prolonged contact with rubber, vinyl products, or tape may leave marks.
Criterion
Voltage fluctuation range
(85 VAC to 264 VAC)
5%C to 40%C
35% to 85% There should
be no condensation.
There should be no dust.
There should be no loose
screws.
There should be no loose
screws.
screws.
There should be no external
abnormalities.
Average life expectancy of
liquid crystal: 50,000 hrs
Average life expectancy of
backlight: 20,000 hrs
Section 8-3
Remarks
Tester
Thermometer
Hydroscope
Visual
Accessory
tool
---
Phillips
screwdriver
Visual
Visual