Mitsubishi Electric Q173CPU User Manual page 172

6 INSPECTION AND MAINTENANCE
Item Inspection item
Input LED
4
Output LED
Cooling fan unit
5 (Q173CPU/Q172CPU
only)
Daily Inspection(continued)
Inspection
Check that the LED is
ON/OFF.
Check that the LED is
ON/OFF.
Check for vibration, howl
and noise.
Check that the connectors
for cooling fan unit is not
dislocated and the hooks
of cooling fan unit is
engaged correctly.
Criterion
The LED must be ON at input signal ON.
The LED must be OFF at input signal OFF.
(Abnormal if the LED does not turn ON or
turn OFF as indicated above.)
The LED must be ON at output signal ON.
The LED must be OFF at output signal OFF.
(Abnormal if the LED does not turn ON or
turn OFF as indicated above.)
No vibration, howl and noise.
(A service life time of the cooling fan unit :
when the number of the revolution lower than
the 20% of the initial time.)
The connectors for cooling fan unit and hooks
of cooling fan unit must be engaged and
installed correctly.
6 - 5
Action
Refer to
"I/O Module Type
Building Block
User's Manual".
Replace it with a
new one if a
service life time of
the cooling fan
unit is exceeded,
Engage the
connectors and
hooks correctly.