Omron CJ Series Operation Manual page 19

Application Precautions
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• Mount Units only after checking terminal blocks and connectors com-
pletely.
• 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 opera-
tion.
• Confirm that no adverse effect 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 PLC (including the Startup Mode)
• 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 or other wiring lines. Doing so
may break the cables.
• When replacing parts, be sure to confirm that the rating of a new part is
correct. Not doing so may result in malfunction or burning.
• Before touching a Unit, be sure to first touch a grounded metallic object in
order to discharge any static build-up. Not doing so may result in malfunc-
tion or damage.
• When transporting or storing circuit boards, cover them in antistatic mate-
rial to protect them from static electricity and maintain the proper storage
temperature.
• When transporting Units, pack them in the packing boxes designed for
them. Do not subject to excessive shock or vibration, or drop them, during
transport.
• Store the Unit between -20 and 75 ° C and 10% to 90% humidity (with no
icing or condensation).
• Do not drop the Unit or allow it to fall during installation.
• Always use the specified wiring material when connecting the Unit.
Terminal block on the Temperature Control Unit: AWG22 to AWG18 (0.32
2
to 8.2 mm ).
• When not using temperature input terminals, connect between 100 and
200 Ω between terminals A and B, as well as B and B' for platinum resis-
tance thermometer and short the input terminals for thermocouples. Do
not connect anything to terminals that are not being used.
• To prevent blocking heat distribution, do not block the exterior of the Tem-
perature Control Unit with other object or block the ventilation holes on the
Unit.
• Be sure that the rated voltage is reached within 2 seconds of turning ON
the power supply.
• Set the parameters of the Temperature Control Unit so that they are
appropriate for the system being controlled. Inappropriate settings can
lead to unexpected operation, which in turn can damage the product or
cause accidents.
• Turn ON the power supply to the load (e.g., heater) at the same time or
before turn ON the power supply to the Temperature Control Unit. Opti-
mum control may not be achieved if power is turned ON in the wrong
order.
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