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National Instruments NI 6520 User Manual page 19

Contains five form a single-pole single-throw (spst) non-latching relay outputs, three form c single-pole double-throw (spdt) non-latching relay outputs, and eight channel-to-channel isolated industrial inputs
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© National Instruments Corporation
To limit these flyback voltages at the inductive load, install a flyback diode
for DC loads or a metal oxide varistor (MOV) for AC loads. For best results,
mount the flyback diode within 18 inches of the load. Figure 12 shows an
external flyback diode installed across an inductive load for DC loads.
Figure 13 shows a MOV installed across an inductive load for AC loads.
Figure 12. Contact Protection for DC Inductive Loads
Figure 13. Contact Protection for AC Inductive Loads
Flyback Diode
V
+
–
VDC
MOV
Inductive Load
VAC
19
NI 6520/6521
CHAN
GND
NI 6520/6521
CHAN
GND
NI 6520/6521 User Guide

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