Toshiba V Series User Manual page 120

Chapter 8 Maintenance and Inspection
8.2 Periodic Check
Check the following items periodically (every 6 months).
• Saving Memory Program Data
Save the user memory data and user program data. Use then Engineering Tool to save
them.
• Shutdown of plant operation
After saving the memory program data, carefully check the shutdown procedures for each
system, then shut down the plant.
• Cleaning modules/units
To clean a module, remove it from the terminal block, blow the module with air, for example,
to remove dust from the module. After cleaning, mount the module back in its original
position.
• Checking units for their installation
Check the terminal block unit and DIN rails how they are mounted. Check that they are not
loose. Retighten the screws, if loose.
• Checking modules for their installation
Check that the fixing screws are neither loose nor missing. Retighten the screws if loose.
• Checking cables
Check the individual cables that they are free of damage. Replace damaged cables if any.
• Checking input power terminal screw
Check that it is not loose. Retighten the screw if loose.
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• Before checking, make sure that input power has been turned off (the switch on the
• There is the danger of electric shock.
• Measuring input voltage
Measure the voltage of DC power supply input for LC51* and check that the voltage is
within the voltage range shown below.
If the voltage is out of the range specified above, check external power line.
• Battery voltage
When the battery voltage drops below 2.8 V, the system finds it as a battery voltage drop,
and the HARD-LED on LC51* blinks.
• Checking battery module replacement date
Check the replacement date of the lithium battery in the battery module EBAT1, and replace
it periodically (about every 2 years).
• Confirming installation environment
Check that the installation environment is appropriate in terms of temperature, humidity,
vibration and dust.
• Checking the process input/output function
It is recommended that you check the accuracy and the operation of input/output when a
periodic inspection is performed, etc.
• Clean the ventilation holes periodically.
• Check that the terminal screws of input power supply, external signals and transmission
signals are not loosened. If any of these screws are loosened, tighten them again.
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incoming/ distributing unit is in the OFF position.
Warning
Model 1000 Loop Controller L1 LC511, 512 User's Manual