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National Instruments NI 9478 manual

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Table of contents for the manual

  • Page 1

    OPERATING INSTRUCTIONS AND S PECIFICATIONS NI 9478 16-Channel, 0–50 V, Sinking Digital Output Module with Programmable Current Limits ni.com/manuals Deutsch Français[...]

  • Page 2

    NI 9478 Operating I nstruction s and Specificati ons 2 ni.com This doc u ment describes ho w to u se the National Instr u ments 9478 and incl u des specif ications and pin assignments for the NI 9478. Vi s i t ni.com/info and enter rd s oftwarever s ion to determine which software yo u need for the mod u les yo u are u sing. For information abo u t[...]

  • Page 3

    © National Inst ruments Corp. 3 NI 9478 Operating Instructi ons and Specific ations Safety Guidelines Operate the NI 9478 only as described in these operating instr u ctions. Hot Surface This icon denotes that the component may be hot. T o u ching this component may res u lt in bodily inj u ry . Safety Guidelines fo r Hazardous Loca tions The NI 9[...]

  • Page 4

    NI 9478 Operating I nstruction s and Specificati ons 4 ni.com Caution S u bstit u tion of components may impair s u itability for Class I, Division 2. Caution For Zone 2 applications, install the system in an enclos u re rated to at least IP 54 as defined b y IEC 60529 an d EN 60529 . Caution For Zone 2 applications, install a protection device acr[...]

  • Page 5

    © National Inst ruments Corp. 5 NI 9478 Operating Instructi ons and Specific ations Special Conditions fo r Marine Appli cations Some mod u les are Lloyd’ s Re gister (LR) T ype Approv ed for marine applications. T o verify Lloyd’ s Register certification, visit ni.com/certification and search for the LR certif icate, or look for th e Lloyd’[...]

  • Page 6

    NI 9478 Operating I nstruction s and Specificati ons 6 ni.com Connecting the NI 9478 The NI 9478 has a 37-pin DSUB connector that pro vides connections for the 16 digital o u tp u t channels. Figure 1. NI 9478 Pin Assignm ents DO0 DO1 DO2 DO3 DO4 DO5 DO6 DO7 Vsup Vsup DO8 DO9 DO10 DO11 DO12 DO13 DO14 DO15 NC COM COM COM COM COM COM COM COM Vsup Vsu[...]

  • Page 7

    © National Inst ruments Corp. 7 NI 9478 Operating Instructi ons and Specific ations Each channel of the NI 9478 has a DO pin to which yo u can connect the load yo u want to control. Each channel also has a COM pin. National Instr u ments recommends yo u provide independent COM wiring for each channel to min imize c u rrent flo w in the COM wiring.[...]

  • Page 8

    NI 9478 Operating I nstruction s and Specificati ons 8 ni.com Connect the de vice to DO and the positi ve lead o f the po wer s u pply . Refer to Fig u re 2 for an ill u stration of how to connect a device to the NI 9478. Figure 2. Connecting a Device to the NI 9478 Yo u m u st connect the V s u p pin to the po wer s u pply to enable a weak cable c[...]

  • Page 9

    © National Inst ruments Corp. 9 NI 9478 Operating Instructi ons and Specific ations Protecting the Mo dule from Flyback V oltage s If the mod u le is switching an ind u ctive or ener gy-storing device s u ch as a solenoid, motor , or relay , and the device does not ha ve flyback protection, install an exte rnal flyback diode as sho wn in Fig u re [...]

  • Page 10

    NI 9478 Operating I nstruction s and Specificati ons 10 ni.com Using Long Cables The ind u ctance of the ca bling that co nnects the NI 947 8, the loads, and the e xternal s u pply stores u p ener gy when a channel is on and passing c u rrent thro u gh the cables. Eac h time a channel is t u rned off, the ener gy stored in the cables is released as[...]

  • Page 11

    © National Inst ruments Corp. 11 NI 9478 Operating Instructi ons and Specific ations Yo u can red u ce the ef fect iv e length of the cabl e by adding a capacitor close to the NI 9478 across the power s u pply leads and adding a diode from the digital o u tp u t line to the V s u p pin line. National Instr u ments recommends that yo u u se a capac[...]

  • Page 12

    NI 9478 Operating I nstructions and Specifications 12 ni .com I/O Protection The NI 9478 pro vides protection against overc u rrent and short-circ u it conditions. Output Current Limit Thresholds The NI 9478 pro vides two config u rable c u rrent limit thresholds for the mod u le, Limit A and Limit B. The NI 9478 contin u o u sly monitors the c u r[...]

  • Page 13

    © National Inst ruments Corp. 13 NI 9478 Operating Instructions and Specific ations Some applications req u ire a large inr u sh c u rrent when a channel is fir st t u rned on. If this inr u sh c u rre nt exce eds the ma xim u m c u rrent limit threshold, yo u may need to disable o verc u rrent protection by programming the channel to ha ve no c u[...]

  • Page 14

    NI 9478 Operating I nstructions and Specifications 14 ni .com Overcurrent Refresh The NI 9478 pro vides an overc u rrent refresh setting that enables a channel to a u tomatically reco ver within the specif ied overc u rrent refresh period if the channel e xceeds its c u rrent limit threshold. If ov erc u rrent refresh is disabled, the channel remai[...]

  • Page 15

    © National Inst ruments Corp. 15 NI 9478 Operating Instructions and Specific ations for that ch annel. Use the fo llowing eq u ation to ca lc u late the percentage of the total po wer b u dget each o u tp u t channel u ses in yo u r application. T o verify that yo u r application keeps the NI 9478 within safe operating specif ications, calc u late[...]

  • Page 16

    NI 9478 Operating I nstructions and Specifications 16 ni .com Example One Yo u are driving a load with 2.0 meters of cable thro u gh a cy cle in which the NI 9478 is on and passing 1.25 A of c u rrent for 40 μ s, then off for 10 μ s. The o u tp u t period is 50 μ s (40 μ s + 10 μ s) so the o u tp u t freq u ency is 20 kHz. The channel u ses 14[...]

  • Page 17

    © National Inst ruments Corp. 17 NI 9478 Operating Instructions and Specific ations Example T wo Yo u are driving a load with 2.0 meters of cable thro u gh a cy cle in which the NI 9478 first is constantly on and passing 3 A of c u rrent for 0.25 seconds, then dri ves th e load at 20 kHz with 1.25 A c u rrent for 1.25 seconds, then driv es the loa[...]

  • Page 18

    NI 9478 Operating I nstructions and Specifications 18 ni.com Sleep Mode This mod u le s u pports a low-po wer sleep mode. S u pport for sleep mode at the system le vel depe nds on the chassis that the mod u le is pl u gged into. Refer to the chassis man u al for information abo u t s u pport for sleep mode. If the chassis s u pports sleep mode, ref[...]

  • Page 19

    © National Inst ruments Corp. 19 NI 9478 Operating Instructions and Specific ations Specifications The follo wing specificat ions are typical for the range – 40 to 70 °C u nless otherwise noted. All v oltages are relativ e to COM u nless otherwise noted. Output Characteristics N u mber of channels ..... ........... .......... 16 digital o u tp [...]

  • Page 20

    NI 9478 Operating I nstructions and Specifications 20 ni.com Switched o u tp u t c u rrent (10 kHz) 1 , per channel All channels on .......... ............ ..... 1 A max Fo u r channels on ................ ........ 2 A max One channel on . ............ ........... ... 4 A max Switched o u tp u t c u rrent (20 kHz) 1 , per channel All channels on ..[...]

  • Page 21

    © National Inst ruments Corp. 21 NI 9478 Operating Instructions and Specific ations Overc u rrent protection threshold selection per ch annel........ ............ ..... Limit A, Limit B, or No Limit Overc u rrent sh u tof f response time .... 1 μ s Overc u rrent refresh conf ig u ration .... Enabled or Disabled Overc u rrent refresh period ......[...]

  • Page 22

    NI 9478 Operating I nstructions and Specifications 22 ni.com Power Requirements Power cons u mption fr om chassis Active mode ............ ........... ........ 1 W max Sleep mode .......... ......... ........... ... 25 μ W max Thermal dissipation (at 70 °C) Active mode ........ ......... ........... ... 1.5 W max Sleep mode .......... ......... .[...]

  • Page 23

    © National Inst ruments Corp. 23 NI 9478 Operating Instructions and Specific ations Safety Maximum Voltage 1 Connect only v oltages that are within the follo wing limits. V s u p -to-COM... ........... ........... ........... . 50 VDC, Meas u rement Category I Meas u rement Cate gory I is for meas u rements performed on circ u its not directly con[...]

  • Page 24

    NI 9478 Operating I nstructions and Specifications 24 ni.com Isolation Voltages Channel-to-channel ...... ............. ........ No isolation bet ween channels Channel-to-earth gro u nd Contin u o u s ................... ......... ..... 60 VDC, Meas u rement Category I W ithstand ............... ........... .......... 1,000 V , v erifi ed by a 5 s [...]

  • Page 25

    © National Inst ruments Corp. 25 NI 9478 Operating Instructions and Specific ations Hazardous Locations U.S. (UL) ........ ........... ......... ........... ... Class I, Di vision 2, Gro u ps A, B, C, D, T4; Class I, Zone 2, AEx nA IIC T4 Canada (C-UL) .......... ........... ........... . Cla ss I, Division 2, Gro u ps A, B, C, D, T4; Class I, Zon[...]

  • Page 26

    NI 9478 Operating I nstructions and Specifications 26 ni.com Operating h u midity (IEC 60068-2-56)....... ........... ............ 10 to 90% RH, noncondensing Storage h u midity (IEC 60068-2-56)....... ........... ............ 5 to 95% RH, noncondensing Maxim u m altit u de.......... ......... .......... 2,000 m Poll u tion Degree (IEC 60664) .....[...]

  • Page 27

    © National Inst ruments Corp. 27 NI 9478 Operating Instructions and Specific ations Electromagnetic Compatibility This prod u ct is designed to meet the req u ire ments of the following standards of EMC for electrical eq u ipment for meas u remen t, control, and laboratory u se: • EN 61326 EMC req u irements; Ind u strial Imm u nity • EN 55011[...]

  • Page 28

    NI 9478 Operating I nstructions and Specifications 28 ni.com ni.com/certification , search by mod u le n u mber or prod u ct line, and click the appropriate link in the Certification col u mn. Environmental Mana gement National Instr u ments is committe d to designing and man u fact u ring prod u cts in an en vironmentally res ponsible manner . NI [...]

  • Page 29

    © National Inst ruments Corp. 29 NI 9478 Operating Instructions and Specific ations ⬉ᄤֵᙃѻક∵ᶧ᥻ࠊㅵ⧚ࡲ⊩ ˄Ё ೑ RoHS ˅ Ё೑ᅶ᠋ National Instruments ヺড়Ё೑⬉ᄤֵᙃ ѻકЁ䰤ࠊՓ⫼ᶤѯ᳝ᆇ⠽䋼ᣛҸ (RoHS) DŽ݇Ѣ National Instruments Ё೑ RoHS ড়㾘ᗻֵᙃˈ䇋ⱏᔩ ni.com/environmen t /rohs_china DŽ (Fo[...]

  • Page 30

    NI 9478 Operating I nstructions and Specifications 30 ni.com Where to Go for Support The National Instr u ments W eb site is yo u r complete reso u rce for technical s u pport. At ni.com/ s upport yo u have access to ev erything from tro u bleshooting and applic ation de velopment self-help reso u rces to email and phone assistance from NI Applicat[...]

  • Page 31

    © National Inst ruments Corp. 31 NI 9478 Operating Instructions and Specific ations K orea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28, Malaysia 1800 887710, Mexico 0 1 800 010 0793, Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322, Norway 47 (0) 66 90 76 60, Poland 48 22 3390150, Port u gal 351 210 311 210, R u ssia 7 495 783 6851, Singap[...]

  • Page 32

    © 2007–2008 Nati onal Instruments Corp. All rights reserved. 374612D-01 Feb08 National Instruments, NI, n i.com, and LabVIEW are trademarks of National Instruments C orporation. Refer to the Terms of Use section on ni.com/legal for more information about National Instruments trademarks. O ther product and company names ment ioned herein are trad[...]