Periodic Inspection - Mitsubishi Electric Q172DCPU User Manual

6 INSPECTION AND MAINTENANCE

6.3 Periodic Inspection

Item Inspection item
Ambient temperature
1 Ambient humidity
Atmosphere
2
Power voltage
Looseness, rattling
3
Adhesion of dirt and
foreign matter
Looseness of terminal
screws
Proximity of solderless
4
terminals to each other
Looseness of
connectors
5
Battery
The items that must be inspected one or two times every 6 months to 1 year are listed
below. When the equipment is moved or modified, or layout of the wiring is changed,
also implement this inspection.
Table 6.2 Periodic Inspection
Inspection
Measure with a thermometer and a
hygrometer.
Measure corrosive gas.
Measure a voltage across the
terminals of 100/200VAC and
24VDC.
Move the module to check for
looseness and rattling.
Check visually.
Try to further tighten screws with a
screwdriver.
Check visually.
Check visually.
Check the 7-segment LED at the
front side of CPU module.
Check the length of term after
purchasing the battery
Check that SM51 or SM58 is
turned OFF using MT Developer in
monitor.
Judgment criteria
0 to 55 °C (32 to 131 °F)
5 to 95 % RH
No corrosive gases
85 to 132VAC
170 to 264VAC
15.6 to 31.2VDC
The module must be installed
solidly.
Dirt and foreign matter must not
be present.
Screws must not be loose.
Solderless terminals must be
positioned at proper intervals.
Connectors must not be loose.
Must be turned OFF "BT1" or
"BT2" display.
Must not be used more than 5
years.
Must be turned OFF.
6 - 5
Remedy
When the controller is used in
the board, the ambient
temperature in the board
becomes the ambient
temperature.
Change the power supply.
Retighten the screws.
If the CPU, I/O, or power supply
module is loose, fix it with
screws.
Remove and clean.
Retighten the terminal screws.
Correct.
Retighten the connector fixing
screws.
Even if the lowering of a battery
capacity is not shown, replace
the battery with a new one if a
service life time of the battery is
exceeded.
Replace the battery with a new
one when SM51 or SM58 is ON.