56
When an inductive load is connected to an I/O Unit, it is necessary to connect a
surge suppressor or diode in parallel with the load as shown below. This is so
that the back EMF generated by the load will be absorbed.
Contact Output Unit
Transistor Output Unit
L
OUT
COM
Surge suppressor
L
OUT
COM
Contact Output Unit
Triac Output Unit
+
Diode
L
IN
COM
Diode
DC input
Use surge suppressors and diodes with the following specifications.
Surge Suppressor
Resistance: 50 Ω
Capacitor: 0.47 µF
Voltage: 200 V
Diode
Leading-edge peak inverse voltage: At least 3 times load voltage
Average rectified current: 1 A
Inductive Load Surge
Suppressor
Output Circuits Section 4-9
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