Daily Inspection - Mitsubishi Electric MELSEC Q Series User Manual

4 INSTALLATION, WIRING, START-UP, AND MAINTENANCE

4.6 Daily Inspection

Item Inspection item
1 Mounting of base unit
2 Installation of I/O module
3 Connecting conditions
Power
[POWER]
supply
LED
module
[MODE]
LED
[RUN] LED
PLC CPU
module
[ERR.] LED
4
[BAT.] LED
QD74MH [RUN] LED
Positioning
module
[ERR.] LED
Input LED
I/O module
Output LED
The items that must be inspected daily are shown below.
Table 4.4 Daily inspection
Inspection
Check that the fixing
screws are not loose
and the cover is not
dislocated.
Check that the module
is not dislocated and
the unit fixing hook is
engaged securely.
Check for loose
terminal screws.
Check for distance
between solderless
terminals.
Check the connector
part of the cable.
Check that the LED is
ON.
Check that the LED is
ON.
Check that the LED is
ON in RUN status.
Check that the LED is
OFF.
Check that the LED is
OFF.
Check that the LED is
ON.
Check that the LED is
OFF.
Check that the LED is
ON/OFF.
Check that the LED is
ON/OFF.
Criterion
The screws and cover must be mounted securely.
The module fixing hook must be engaged and installed
correctly.
Screws should not be loose.
The proper clearance should be provided between
solderless terminals.
Connections should not be loose.
The LED must be ON (green).
(Abnormal if the LED is OFF or ON (red)).
The LED must be ON (green).
(Abnormal if the LED is OFF or flickering.)
The LED must be ON.
(Abnormal if the LED is OFF.)
The LED must be OFF.
(Abnormal if the LED is ON or flickering.)
The LED must be OFF.
(Abnormal if the LED is ON.)
The LED must be ON.
(Abnormal if the LED is OFF.)
The LED must be OFF.
(Abnormal if the LED is ON or flickering.)
The LED must be ON when the input power is turned ON.
The LED must be OFF when the input power is turned OFF.
(Abnormal if the LED does not turn ON or turn OFF as
indicated above.)
The LED must be ON when the input power is turned ON.
The LED must be OFF when the input power is turned OFF.
(Abnormal if the LED does not turn ON or turn OFF as
indicated above.)
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MELSEC-Q
Action
Retighten the
screws.
Securely engaged
the module fixing
hook.
Retighten the
terminal screws.
Correct.
Retighten the
connector fixing
screws.
Refer to the
"QCPU User's
Manual (Function
Explanation,
Program
Fundamentals)".
Refer to Section
2.4
Refer to
"I/O Module Type
Building Block
User's Manual".