National Instruments NI-9477 Getting Started Manual Download Page 15 | Manualshive

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Protecting the Digital Outputs from Flyback
Voltages

If the channel is switching an inductive or energy-storing device

such as a solenoid, motor, or relay, and the device does not have

flyback protection, install an external flyback diode.

Figure 3.

Connecting a Flyback Diode

Inductive

Device

+

–

NI 9477

COM

DO

External
Power
Supply

Flyback

Diode

14

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ni.com

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NI 9477 Getting Started Guide

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Summary of Contents for NI-9477

Page 1: ...NI 9477...

Page 2: ...GETTING STARTED GUIDE NI 9477 32 DO 0 V to 60 V Sinking 8 s...

Page 3: ...Refer to the documentation for each component in the system to determine the safety and EMC ratings for the entire system Safety Guidelines Operate the NI 9477 only as described in this document Cauti...

Page 4: ...tand test Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage MAINS is a hazardous live electrica...

Page 5: ...circuits are not intended for direct connection to the MAINS building installations of Measurement Categories CAT II CAT III or CAT IV Safety Guidelines for Hazardous Locations The NI 9477 is suitabl...

Page 6: ...the system in an enclosure rated to at least IP54 as defined by IEC EN 60079 15 Caution For Division 2 and Zone 2 applications install a protection device across the external power supply and the COM...

Page 7: ...ces do not exceed 140 of the rated voltage Caution The system shall only be used in an area of not more than Pollution Degree 2 as defined in IEC 60664 1 Caution The system shall be mounted in an ATEX...

Page 8: ...television reception and prevent unacceptable performance degradation install and use this product in strict accordance with the instructions in the product documentation Furthermore any changes or mo...

Page 9: ...ure that the desired EMC performance is attained Preparing the Environment Ensure that the environment in which you are using the NI 9477 meets the following specifications Operating temperature IEC 6...

Page 10: ...O25 DO26 DO27 DO28 DO29 DO30 DO31 DO0 DO1 DO2 DO3 DO4 DO5 DO6 DO7 COM COM DO8 DO9 DO10 DO11 DO12 DO13 DO14 DO15 NC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 3...

Page 11: ...on NC No connection Connecting Digital Devices You can connect a variety of industrial devices such as solenoids motors actuators relays and lamps to the NI 9477 You must connect an external power sup...

Page 12: ...modules from your system if the external power supply connected to the Vsup and COM pins is powered on Ensure that the devices you connect to the NI 9477 are compatible with the output specifications...

Page 13: ...ou can connect any number of channels together in parallel For example if you want to drive 4 A of current connect DO0 through DO3 in parallel as shown in the following figure You must turn all parall...

Page 14: ...igure 2 Increasing the Current to a Device Connected to the NI 9477 NI 9477 DO3 DO1 DO0 DO2 4 A _ COM 1 A 1 A 1 A 1 A External Power Supply Device NI 9477 Getting Started Guide National Instruments 13...

Page 15: ...tive or energy storing device such as a solenoid motor or relay and the device does not have flyback protection install an external flyback diode Figure 3 Connecting a Flyback Diode Inductive Device N...

Page 16: ...ompactRIO NI CompactDAQ RELATED INFORMATION NI 9477 Datasheet NI RIO Help LabVIEW FPGA Help NI 9477 Datasheet NI DAQmx Help LabVIEW Help C Series Documentation Resources ni com info cseriesdoc Service...

Page 17: ...NI product Product registration facilitates technical support and ensures that you receive important information updates from NI A Declaration of Conformity DoC is our claim of compliance with the Co...

Page 18: ...tes create your service request at ni com support or dial 1 866 ASK MYNI 275 6964 For telephone support outside the United States visit the Worldwide Offices section of ni com niglobal to access the b...

Page 19: ...arty legal notices in the readme file for your NI product Refer to the Export Compliance Information at ni com legal export compliance for the NI global trade compliance policy and how to obtain relev...

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