Toshiba Programmable Controller PROSEC T3 - Manual (Page 78)

S.Maintenance and Checking
5.2
Periodical checking
items
Check the T3 based on the following points every six months.
Also perform checks when the operating environment is changed.
Item Content of checking Corrective measures
Power supply Measure the voltage of the
power (at the terminal of the
module) 85 to 132/170 to 264 Vac
20.4 to 28.8 Vdc
Check that the terminal screw of
the module is not loose.
Check that the terminal screw of
the module is not loose.
Check that wiring cable is not
damaged. Check that wiring cable is not
damaged.
Installation
condition
Check that the basic unit is
installed securely. Not loose, no play
Check that the expansion unit is
installed securely.
Not loose, no play
Check that each module is
irrstalled securely. Not loose, no play
Check that each expan^n
cable connector is not loose; and
the cable is not damaged.
Not loose, not damaged
Programmer Check that the functions of the
programmer are norrrral. Try executing simple operations.
Check that the connector and the
cable are not damaged. Not damaged
I/O modules Measure the vdtage of each of
the I/O modules at the terminal
block.
The voltage must be within the
spedtied range.
Check the LED of the input
status display. The LED must light normally.
Check the LED of the output
status display.
The LED must light normally.
Check tiiat the I/O teminal block
is installed securely. Not loose, no play
Check that the terminal screw is
not loose and the terminal has a
sufficient distance to the next
terminal. Not loose, and not contacting the
next terminal
Check that the wiring cat^e is not
damaged. Not darrraged
Environment Check that the temperature,
humidity, vibration, dust, etc. are
within the specified range.
Must be within the general
specification range.
Program Check that the content of the
PLC program and the master
program (e.g., saved on a floppy
disk) are the same.
Check that these programs are
identical by comparison.
Battery Check whether the battery must
be replaced. (The installed date
is written on the rear of the CPU
battery cover.) Replace the current bettery if
more than two years has elapsed.
Check that the connector of the
battery is inserted firmly. Not loose
70
PROSEC T3