Periodic Inspection - Mitsubishi Electric Q26UD(E)HCPU User Manual

13.2

Periodic Inspection

The items that must be inspected one or two times every 6 months to 1 year are listed below.
When the equipment has been relocated or modified, or wiring layout has been changed, perform this inspection.
No. Inspection item
Ambient temperature
Ambient humidity
1
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
6 PLC diagnostics
7 Maximum scan time
*1 When an AnS/A Series module is used in the system, the criteria will be from 10 to 90%RH.
*2 The ambient temperature is the temperature inside the control panel where the programmable controller is installed.
254
Inspection details
*2
Measure with a thermometer
and a hygrometer.
Measure corrosive gas.
Measure a voltage between 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 BAT. LED at the
front side of the CPU module.
Check the length of term after
purchasing the battery.
Check that SM51 or SM52 is
turned off using a programming
tool in monitor mode.
Check the Error log.
Check the values of SD526
and SD527 using a
programming tool in the
monitor mode.
Criteria
0 to 55°C
*1
5 to 95%RH
Corrosive gas must not be
present.
85 to 132VAC
170 to 264VAC
15.6 to 31.2VDC
The module must be installed
securely.
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.
The LED must be off.
Must not be used more than 5
years.
Must be turned off.
The Error log must not be
updated.
Maximum scan time must be
within the allowable range
given in the specification of the
system.
Action
Ensure that the ambient
environment meets the criteria.
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.
Replace the battery when the
BAT. LED is on.
Replace the battery if it has
been used more than 5 years.
Replace the battery when
SM51 or SM52 is on.
Page 282, Section 15.2
Specify factors that increase
the scan time.
(Check the operation status of
the trigger signal that passes
through a loop if loop positions
exist in the sequence
program.)