Toshiba T2N - Manual (Page 87)

5.Maintenance and Checks
72 PROSEC T2N
Check the following items periodically (about once every 6 months).Check also
when the operating conditions/enviroment change.
Item Check Criteria
Power supply voltage (measure
at the module’s power supply
terminals.) 85
∼
264Vac
20.4
∼
28.8Vdc
Is there any slack in the power
supply terminal block screws ? Must not be loose.
Power Supply
Is there any damage to
the wires and cables ? Must not be damaged.
Is the basic unit firmly secured ? Must not be any slack or
play.
Are the expansion units firmly
secured ? Must not be any slack or
play.
Is each module firmly installed ? Must not be any slack or
play.
Mounting
Condition
Is there any slack in the
expansion cable connctors or
any damage to the cables ? Must not be any slack or
damage.
Is there any problem with the
programmer functions ? Execute simple
operations. Programmer
Is there any slack in the
connectors or damage to
the cable. Must not be any slack or
damage.
Measure the voltage at each I/O
terminal block. Must be within
the specified values.
Check the input state display
LEDs. Must light when normal.
Check the output state display
LEDs. Must light when normal.
Are the I/O terminal blocks
firmly secured ? Must not be any slack or
play.
Is there any slack in the terminal
screws, or is there any risk of
adjacent terminals touching
each other ? There must not be any
slack or risk of mutual
contact.
I/O Modules
Is there any damage to
the wires and cables ? Must not be any damage.
Environment Check that temperature,
humidity, vibration,dust,etc are
within the specified values. Must be within the
general specifications.
Program Check that the contents of the
basic program and the master
program (kept on a floppy disk
or the like) agree. Contents must agree
when carrying out
a comparative check
Does the battery require
changing ? (The battery
installation date is recorded on
the optional card cover). A change is
recommended if 2 years
have elapsed. Battery
Are the battery connctors firmly
connected ? Must not be any slack.
5.2
Periodic Checks