Omron CJ - 08-2008 Operation Manual page 634

Specifications of Basic I/O Units
About Contact Output Units
Service Life Expectancy of CJ1W-OC201/211 Relays
The service life expectancy of the relays (NY-24W-K-IE)
shown in the following diagrams. Use the diagrams to calculate the relay service life based on the operating
conditions, and replace the relay before the end of its service life.
Note The diagrams show the life expectancy of the relay itself. Do not use a contact current, therefore, that
exceeds the maximum switching capacity specified in the specifications for each Contact Output Unit. If
a switching capacity exceeding the specifications is used, the reliability and life expectancy of other
parts will be reduced and the Unit may malfunction.
Service Life with AC Load
240 V AC
cos φ = 0.4
Inductive Load
The life of the Relay varies with the load inductance. If any inductive load is connected to the Contact Output
Unit, use an arc killer with the Contact Output Unit using an inductive load.
Be sure to connect a diode in parallel with every DC inductive load that is connected to the Contact Output
Unit.
Contact Protection Circuit
Arc killers are used with the Contact Output Unit in order to prolong the life of each Relay mounted to the Con-
tact Output Unit, prevent noise, and reduce the generation of carbide and nitrate deposits. Arc killers can, how-
ever, reduce relay life if not use correctly.
Note Arc killers used with the Contact Output Unit can delay the resetting time required by each Relay
mounted to the Contact Output Unit.
586
120 V AC, resistive load
240 V AC, resistive load
120 V AC
cos φ = 0.4
Contact current (A)
CJ1W-OC201/211 Contact Output Units is
in the
Service Life with DC Load
24 V DC τ = 7 ms
Contact current (A)
Appendix A
24 V DC, resistive load