Limit flyback voltages at the inductive load by installing one of
the following:
• For DC loads—Install a flyback diode within 45.72 cm of the
load.
• For AC loads—Install a metal oxide varistor (MOV) rated for
30 Vrms or slightly higher.
Figure 3. Contact Protection for DC Inductive Loads
+
–
CHa
CHb
Inductive
Load
NI 9485
Flyback Diode for
DC Inductive Loads
V
DC
14 | ni.com | NI 9485 Getting Started Guide
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