Toshiba Programmable Controller PROSEC T3 Uživatelský manuál stáhnout pdf (Strana 60)

3. Precautions for I/O Modules

(4) If the AC lines are installed in parallel with high frequency or

power lines, induced current may cause erroneous input. In this

case, take necessary countermeasures as follows:

• Change the installation route of AC input lines so that

they are not parallel with power lines and high

frequency lines.

• Use twisted-pair cables as input lines.

• Use shielded cables as input lines.

• Use relays at the leading in the control panel (the relay

must satisfy larger ON current).

• Install a bleeder resistor to lower the input impedance.

(5) If the input module and an inductive load are connected in

parallel, a surge voltage generated at both-ends of the load

when the contact is changed to OFF may cause a malfunction of

the PLC. In this case, install a surge absorption element in

parallel with the load to suppress the surge voltage.

Input module

)

----------------------------------------------------------

-0^

Hl-O-

---------

Inductive load

^ ^ Surge absorption element (snubber circuit, etc.)

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Toshiba Programmable Controller PROSEC T3 Uživatelský manuál Strana 60