Output Wiring; Relay Output - Mitsubishi Electric MELSEC iQ-F FX5U User Manual

6.6

Output Wiring

The output wiring of the CPU module, I/O modules, and terminal modules is explained below.

Relay output

For output specifications of the CPU module, refer to Page 25 Output Specifications.
For output specifications of the I/O modules, refer to Page 173 Output specifications.
For output specifications of the terminal modules, refer to Page 188 Output specifications.
Product life of relay output contacts
The product life of relay output contacts varies considerably depending on the load type used.
Note that loads generating reverse electromotive force or rush current may cause poor contact or welding of contacts which
may lead to considerable reduction of the contact product life.
■Inductive load
Inductive loads generate large reverse electromotive force between contacts at shutdown, which may cause arc discharge. At
a fixed current consumption, as the power factor (phase between current and voltage) gets smaller, the arc energy gets larger.
The following table shows the standard life of contacts used for inductive loads, such as contactors and solenoid valves.
Model
CPU module, FX5-EYR/ES, FX5-32ER/S
Terminal module
The following table shows the approximate life of a relay based on the results of an operation life test.
• Test condition: 1 sec. ON/1 sec. OFF
Load capacity
■CPU module, FX5-EYR/ES, FX5-32ER/S
20 VA
35 VA
80 VA
■Terminal module
35 VA
80 VA
120 VA
The product life of relay contacts becomes considerably shorter than the above conditions when the rush overcurrent is shut
down.
Please refer to the following measures regarding the inductive load.
Page 116 Contact protection circuit for inductive loads
Some types of inductive loads generate rush current 5 to 15 times the stationary current at activation. Make sure that the rush
current does not exceed the current corresponding to the maximum specified resistance load.
■Lamp load
Lamp loads generally generate rush current 10 to 15 times the stationary current. Make sure that the rush current does not
exceed the current corresponding to the maximum specified resistance load.
6 WIRING
114
6.6 Output Wiring
Inductive load
20 VA
35 VA
0.2 A/100 V AC
0.1 A/200 V AC
0.35 A/100 V AC
0.17 A/200 V AC
0.8 A/100 V AC
0.4 A/200 V AC
0.35 A/100 V AC
0.17 A/200 V AC
0.8 A/100 V AC
0.4 A/200 V AC
1.2 A/100 V AC
0.6 A/200 V AC
Standard life
500,000 times
Contact life
3,000,000 times
1,000,000 times
200,000 times
3,000,000 times
1,000,000 times
200,000 times