Daily Inspection; Periodic Inspection - Mitsubishi 900 Series User Manual

7 MAINTENANCE AND INSPECTION

7.2 Daily Inspection

Daily inspection items are as follows.
Number Inspection Item
1 Module mounting status
Loose
terminal
screws
Connection Proximate
2
status solderless
terminals
Loose
connectors

7.3 Periodic Inspection

Inspection items to be checked once or twice in six months or one year are as follows.
The following inspection should also be performed when equipment has been moved
or modified or the wiring changed.
Number Inspection Item
Ambient
temperature
Surround-
ing
1
environ-
Ambient
ment
humidity
Atmos-
phere
Power supply voltage
2
check
Looseness
Mounting
3 Dirt, foreign
status
matter
Loose
terminal
screws
Connection
Proximate
4
status solderless
terminals
Loose
connectors
7 - 2
Inspection Method
Check for loose mounting
screws and disconnected Securely mounted
cover
Retighten screws with
Not loose
screwdriver
Visual check Proper intervals
Visual check Not loose
Inspection Method
Display
section
Make measurement with Other
portions
thermometer or
hygrometer
10 to 90%RH
Measure corrosive gas
No corrosive gas
24VDC
Measure voltage across 20.4DC to 26.4V
terminals
Move module Should be mounted firmly Retighten screws
No dirt, foreign matter
Visual check
sticking
Retighten screws with
Not loose
screwdriver
Visual check Proper intervals
Visual check Not loose
MELSEC-GOT
Criterion Action
Retighten screws
Retighten terminal
screws
Correct
Retighten connector
fixing screws
Criterion Action
C
0 to 40
For use in enclosure,
C
0 to 55
temperature inside
enclosure is ambient
temperature
Change supply power
Remove, clean
Retighten terminal
screws
Correct
Retighten connector
fixing screws
7
7 - 2