82
•
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 item
Inspection content
Criterion
Remarks
Power supply
Measure at the power supply terminal block. Are
voltage fluctuations within the criterion?
Voltage fluctuation range
(85 VAC to 264 VAC)
Tester
Operating
environment
Is the ambient temperature (the temperature inside
of the panel) suitable?
5
%
C to 40
%
C
Thermometer
Is the ambient humidity (the humidity inside of the
panel) suitable?
35% to 85% There should
be no condensation.
Hydroscope
Is dust collecting?
There should be no dust.
Visual
Installation
Is each Terminal firmly secured?
There should be no loose
screws.
Accessory
tool
Are the connectors for the connecting cable inserted
perfectly and locked?
There should be no loose
screws.
---
Are any screws for the external wiring coming loose? There should be no loose
screws.
Phillips
screwdriver
Is any external wiring loose or disconnected?
There should be no external
abnormalities.
Visual
Replaceable
parts
Can you read the characters on the liquid crystal
display?
Is the backlight illumination as bright as it should be?
Average life expectancy of
liquid crystal:
50,000 hrs
Average life expectancy of
backlight:
20,000 hrs
Visual
Tools for Inspection
•
Phillips and Flat-blade screwdrivers
•
Voltage tester or digital voltmeter
•
Industrial alcohol and all-cotton cloth
Measuring Instruments (Depending on Case)
•
Synchroscope
•
Oscilloscope with pen output
•
Thermometer
•
Hydroscope
Precautions for Handling
•
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.
8-3-3
Precautions When Cleaning the PT Screen
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.
Maintenance and Inspection
Section 8-3
Содержание NT600M Series
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