Omron ZEN - Page 77

53
Wiring Section 2-2
Output Wiring Precautions
(1) Output Short Circuit Protection
We recommend adding a protective fuse to all output circuits to
protect the output elements and PCBs from burning if the load
connected to the output terminal short-circuits.
(2) Inductive Loads
When connecting an inductive load to an input, connect a surge
protector or diode in parallel with the load.
The surge protector’s components should have the following ratings:
The diode should satisfy the following requirements:
Peak reverse-breakdown voltage must be at least 3 times the load
voltage.
Average rectified current must be 1 A.
OUT
COM
ZEN
Surge protector
Relay Output
(+)
(−)
ZEN
Diode
Relay Output
(Transistor Output)
(+)
(−)
ZEN
Relay Output
(Transistor Output)
Diode
Z211-E1-03.book Page 53 Friday, November 21, 2008 10:38 AM