5Application Precautions
xiv
• Interlock
circuits, limit circuits,
and similar safety measures in external circuits
(i.e.,
not in the Programmable Controller) must be provided by the customer
.
• Always
use the power supply voltage specified in the operation manuals. An
incorrect voltage may result in malfunction or burning.
• Take
appropriate measures to ensure that the specified power with the rated
voltage
and frequency is supplied. Be particularly careful in places where the
power
supply is unstable. An incorrect power supply may result in malfunction.
• Install
external breakers and take other safety measures against short-circuit
-
ing
in external wiring. Insuf
ficient safety measures against short-circuiting may
result in burning.
• Do not apply voltages to the Input Units in excess of the rated input voltage.
Excess voltages may result in burning.
• Do not apply voltages or connect loads to the Output Units in excess of the
maximum switching capacity. Excess voltage or loads may result in burning.
• Disconnect
the functional ground terminal when
performing withstand voltage
tests.
Not disconnecting the functional ground terminal may result in burning.
• Install
the Unit properly as
specified in the operation manual. Improper installa
-
tion of the Unit may result in malfunction.
• Be sure that all the mounting screws, terminal screws, and cable connector
screws
are tightened to the torque specified in the
relevant manuals. Incorrect
tightening torque may result in malfunction.
• Leave
the label attached to
the Unit when wiring. Removing the label may re
-
sult in malfunction.
• Remove
the label after the completion of wiring to ensure proper heat dissipa
-
tion. Leaving the label attached may result in malfunction.
• Use
crimp terminals for wiring. Do not connect bare stranded wires directly to
terminals. Connection of bare stranded wires may result in burning.
• Double-check
all the wiring before turning ON the power supply
. Incorrect wir
-
ing may result in burning.
• Mount the Unit only after checking the terminal block completely.
• Be
sure that the terminal blocks, Memory
Units, expansion cables, and other
items with locking devices are properly locked into place. Improper locking
may result in malfunction.
• Check
the user program for proper execution before actually running it on the
Unit. Not checking the program may result in an unexpected operation.
• Confirm
that no adverse ef
fect will occur in the system before attempting any of
the following. Not doing so may result in an unexpected operation.
• Changing the operating mode of the PC.
• Force-setting/force-resetting any bit in memory.
• Changing the present value of any word or any set value in memory.
• Do
not pull on the cables or bend the cables beyond their natural limit.
Doing
either of these may break the cables.
• Do not place objects on top of the cables. Doing so may break the cables.
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