7-2 Inspection and Cleaning
• Inspection Items
Inspect the PT for the following items to check whether the PT is operating within the speci-
fied criteria. If the PT is outside the criteria, use measures such as improving the operating
environment to conform to the standards, or tightening screws.
Inspection
items
Inspection details Criteria Inspection means
Power
supply
Power terminal voltage
fluctuation
Allowable voltage range
(24 VDC ±15%)
Tester
Ambient temperature
(temperature in control panel)
0 to 50°C
(Refer to Appendix 1.)
Thermometer
Ambient humidity
(temperature in control panel)
35% to 85%
(Refer to Appendix 1.)
Temperature meter
Presence of dust No dust accumulated. Visual inspection
Ambient
environment
Presence of oil No oil between front panel sheet
and molding.
Visual inspection
Looseness of fixed mounting
bracket
Specified torque. Phillips screwdriver
Connection status of
Connecting Cable
Connectors
Fully inserted, locked, and with
No looseness.
Phillips screwdriver
Looseness of external wiring
screws
No looseness. Phillips screwdriver
Mounting
conditions
Status of external connecting
cables
No breaks or other damage Visual inspection,
tester
Backlight brightness Sufficient brightness.
Backlight life (at room tempera-
ture of 25°C) is 50,000 hours,
as a guideline.
Visual inspection
Parts with
limited
service life
Battery 5 years (at room temperature of
25°C).
Replace every 5
years
Note
• Do not disassemble, repair, or modify the PT.
• Follow all local government regulations, where applicable, when disposing of the Unit and
used batteries.
7-5
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