Toshiba nv Series Instruction Manual page 134

Appendix C Notes on Applying the I/O Modules
116
6F8C1575
Where
2
(100[V])
P= × (2.5〜3) ≒ 3 [W]
10[kΩ]
In addition, you must make sure that when the bleeder resistor is selected as
above, the output current at sensor ON time is within the tolerance.
Sensor output current
(3) If a log external wiring of AC input is routed, an induced current may flow from the
charging wiring to the open-circuited wiring because of the capacity across the
cable. In this case, input OFF may be unable to be read although the
corresponding output is OFF. You should make provisions for this case generally
by installing a bleeder resistor between the input terminals to lower the input
impedance. In addition, you may need to consider applying DC input in some
cases. (For selecting the bleeder resistor, see Subsection (2) above.)
Capacitive coupling
(4) If an external wiring of an AC input is routed across a long distance along a power
line or high-frequency signal line, input errors may occur due to an induced current.
In this case, consider the following measures:
・ Reconsider the AC input wiring route to avoid parallel routing to a power line or
high-frequency signal line.
・ Use a twisted pair cable as the input wiring.
・ Use a shielded cable as the input wiring.
・ Relay the cable at the inlet to the control board. (Use a relay with large ON
current.)
・ Install the bleeder resistor to lower the input impedance.
(5) If the input module and inductive load are connected in parallel, with the input
contact, the controller may malfunction due to the surge voltage generated
between the two ends of the load at contact OFF time. In this case, install a surge
absorbing element in parallel to the load to suppress the surge voltage.
Bleeder resistor
容量性結合 ブリーダ抵抗
Figure C-7 Routing provisions
Input module
入力モジュール