Daily Inspection - Mitsubishi MELSEC- Q Q12PHCPU User Manual

10 MAINTENANCE AND INSPECTION

10.1 Daily Inspection

The items that must be inspected daily are listed below.
Item Inspection Item
1 Installation of base unit
Installation of I/O
2
module
3 Connecting conditions
Power supply
" "
POWER LED
CPU
" "
RUN LED
CPU
" "
ERR. LED
CPU
" "
BAT. LED
4
Input LED
Output LED
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Daily inspection
Inspection
Check that fixing screws
The screws and cover must be installed
are not loose and the
securely.
cover is not dislocated.
Check that the module is
not dislocated and the The module fixing hook must be engaged
and installed securely.
module fixing hook is
engaged securely.
Check for loose terminal
Screws should not be loose.
screws.
Proximity of solderless The proper clearance should be provided
terminals to each other between Solderless terminals
Connectors of extension
Connections should no be loose.
cable
The LED must be ON. (Abnormal if the
Check that the LED is ON.
LED is OFF.)
Check that the LED is ON The LED must be ON. (Abnormal if the
in RUN status. LED is OFF.)
Check that the LED is The LED must be OFF. (Abnormal if the
OFF. LED is ON or flickering.)
Check that the LED is The LED must be OFF. (Abnormal if the
OFF. LED is ON.)
The LED must be ON when the input
power is turned ON.
Check that the LED turns The LED must be extinguished when the
ON and OFF. input power is turned OFF.
(Abnormal if the LED does not turn ON or
turn OFF as indicated above.)
The LED turns ON when the output power
is turned ON.
Check that the LED turns The LED must be extinguished when the
ON and OFF. output power is turned OFF.
(Abnormal if the LED does not turn ON or
turn OFF as indicated above.)
Judgment Criteria
MELSEC-Q
Remedy
Further tighten the
screws.
Securely engaged
the module fixing
hook.
Retighten terminal
screws
Correct.
Retighten connector
mounting screws.
Follow Section 11.2.
10
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