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National Instruments NI USB-6525, USB-6525 data aquisition (DAQ) device Figure 7. Contact Protection for DC Inductive Loads, Figure 8. Contact Protection for AC Inductive Loads

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USB-6525 User Guide and Specifications 8 ni.com

Figures 7 and 8 show examples of using an external flyback diode to protect DC inductive loads and an MOV to protect AC inductive loads, respectively.

Figure 7. Contact Protection for DC Inductive Loads

Figure 8. Contact Protection for AC Inductive Loads

Inductive

Load

USB-6525

Flyback Diode for

DC Inductive Loads

VDC

–

P0.

Inductive

Load

USB-6525

MOV for AC

Inductive Loads

VAC

P0.

Contents

Main USER GUIDE AND SPECIFICATIONS NI USB-6525 Introduction Installing Software Hardware Setting Up Hardware I/O Connector Signal Descriptions Digital I/O Optically Isolated Inputs Sensing DC Voltages Signal Connection Example Solid-State Relay (SSR) Outputs Power-On and Power-Off Conditions Protecting Inductive Loads Figure 7. Contact Protection for DC Inductive Loads Figure 8. Contact Protection for AC Inductive Loads Using the USB-6525 as a TTL Output Device Event Counter Specifications Isolated Inputs Solid-State Relay Outputs Counter Bus Interface Power Requirements Physical Characteristics Safety Standards Isolation Hazardous Locations Environmental Electromagnetic Compatibility CE Compliance Safety Guidelines Page Where to Go for Support