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National Instruments 7604 manual

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Table of contents for the manual

  • Page 1

    National Instruments™, NI™, and ni.com™ are t rademarks of National Instruments Corporation. Product and company names mentioned herein are trademarks or tra de names of their respectiv e companies. 322454C-01 Copyright © 1999, 2001 National Instr uments Corp. All rig hts reserved. July 2001 USER GUIDE MID-7604/7602 P OWER D RIVE This user g[...]

  • Page 2

    MID-7604/7602 Power Drive 2 ni.com Technical Support Resources ............. ............... ........... .............. .............31 NI Web Support......................... ........... ........... .............. ............ .......31 Worldwide Support .......................................................................... 31 Compliance FCC/C[...]

  • Page 3

    © National Instruments Corporation 3 MID-7604/7602 Power Drive • Connect the equipment into an outlet on a circuit diffe rent from that to which the rec eiver is connected. • Consult the dealer or an experienced radio/TV technician for help. Canadian Depart ment of Communications This Class B digital apparatus meets all requirements of the Can[...]

  • Page 4

    MID-7604/7602 Power Drive 4 ni.com Introduction National Instruments ’ MID-7 604/7602 power dri ve is a complete po wer amplifier and system interface for use with four or two axes of simultaneous stepper motion c ontrol. Ideally suited to indu strial and laboratory applications, the MID-7604/7602 has ev erything you need to connect motors, encod[...]

  • Page 5

    © National Instruments Corporation 5 MID-7604/7602 Power Drive ❑ One of the follo wing shielded cable assemblies, as applicable: – SH68-C68-S (part number 186381 -02) – SHC68-C68-S (part number 186380-02) Deta i l ed speci f i ca t ions f o r t he MID- 7 604 / 76 0 2 a re in the S p ecif i c a ti o ns section in this guide. Safety Informatio[...]

  • Page 6

    MID-7604/7602 Power Drive 6 ni.com • Pollution D egree 2 — Normally only noncon ductiv e pollu tion occurs. Occasionally , noncon ducti ve pollution becomes conducti ve because of condensation. • Pollution D egree 3 — Conductiv e poll ution or dry , n onconductiv e pollution occurs. Nonconduct i ve pollution becom es conductiv e because of [...]

  • Page 7

    © National Instruments Corporation 7 MID-7604/7602 Power Drive The following is a diagram of a sample installati on. Warning The stepper motor connectors on this dri ve are energized when the unit is powered on. Disconnect the MID-7604/7602 unit from t he po w er outlet before connecting wires to or disconnecting wires from the stepper connectors.[...]

  • Page 8

    MID-7604/7602 Power Drive 8 ni.com The two rock er switches on the MID-7604/7602 front panel are the A C POWER and EN ABLE. Figure 1 sho ws the location of these switch es. The A C PO W ER switch energizes the motor bus (+24 V) and the logic (+5 V) pow er supplies. When switched on, the green po wer LED labeled +5 V illuminates. If this LED fails t[...]

  • Page 9

    © National Instruments Corporation 9 MID-7604/7602 Power Drive Caution Be sure to turn off the EN ABLE switch and the main A C power to your MID-7604/7602 and host comput er before connecting the accessory to your motion controller . Warning The stepper motor connectors on this dri ve are energized when the unit is powered on. Disconnect the MID-7[...]

  • Page 10

    MID-7604/7602 Power Drive 10 ni.com If the DC power supplies are acti ve, the green po wer LED illuminates. If this LED fails to illuminate, check the power cord and the main input fuse on the f ront panel. The LED status array is arranged b y motor axes. Each of the four columns represents an axis, and each of the three rows represents a particula[...]

  • Page 11

    © National Instruments Corporation 11 MID-7604/7602 Power Drive Front Panel DIP Switch Settings The MID-7604/7602 front panel has a detachable metal plate that when remov ed provides access to four 10-position DIP switch banks. Refer to Figure 1 for the location of t hese switches. Use the first nine DIP switches on each 10-pos ition DIP switch ba[...]

  • Page 12

    MID-7604/7602 Power Drive 12 ni.com Microstepping Selection The MID-7604/7602 uses bipolar chopper, tw o -phase microsteppi ng dri vers with a broad range of microstep rates. The factory default setting is 10-times microstepping (2,000 steps/rev with standard 1.8 º stepper motors). T able 2 shows the DIP switch settings for all possible microstep [...]

  • Page 13

    © National Instruments Corporation 13 MID-7604/7602 Power Drive Output Current Settings The MID-7604/7602 can provide 0.20 – 1.4 A peak (0.14 – 1AR M S ) , depending on the peak output current DIP switch settings for each axis. DIP switches 1 through 4 control the peak o utput current. T able 3 shows the DIP switch settings for all p ossible p[...]

  • Page 14

    MID-7604/7602 Power Drive 14 ni.com T o determine the maximum total power dissipation of all of the m otors combined, add up the maximum po wer each motor can dissipate. If this v alue is less than or equal to 80 W continuous, you will not exceed the capabilities of the MID -7604/7602. If the v alue is greater than 80 W continuous, you may sti ll b[...]

  • Page 15

    © National Instruments Corporation 15 MID-7604/7602 Power Drive Inhibit Input Polarity Setting The MID-7604/7602 has a DIP switch that globall y sets the polarity f or the inhibit input for all axes. DIP switch 10 on the axis 1 DIP switch ban k controls this setting. Refer to Figures 1 and 3 for the location of this switch. The factory default set[...]

  • Page 16

    MID-7604/7602 Power Drive 16 ni.com Back Panel Connector Wiring Motor Power T erminal Blocks Each axis on the MID-7604/7602 has a separat e 5-position remov able scre w terminal block for motor power wiring. Figure 4 sho ws a typical stepper motor configuration pin assignment. Note The dotted loop indicates a shielded cable. A line abo ve a signal [...]

  • Page 17

    © National Instruments Corporation 17 MID-7604/7602 Power Drive Caution Ne ver connect unused cent er taps or winding terminals to pin 3 ( ground) or to each other . Encoder T erminal Blocks For quadrature incremental encoder signals, each MID-760 4/7602 axis has a separate 8-position remov able screw terminal block. Where applicable, the MID-7604[...]

  • Page 18

    MID-7604/7602 Power Drive 18 ni.com If the encoder cable length is great er than 10 ft, use encoders wit h line dri ver outputs for your applicatio ns. Po wer for a +5 V encoder — generated by a po wer supply inside the M ID-7604/760 2 — is a vailable on pin 7 . Note If you require other encoder power v oltages, reference an external po wer sup[...]

  • Page 19

    © National Instruments Corporation 19 MID-7604/7602 Power Drive Figure 8 shows clockwise and counter- clockwise motor rotatio n. Figure 8. Clockwise and Counter -Clockwise Motor Rotation When connecting the enco der wiring to your MID-7604 /7602, use shielded wire of at least 24 A WG. Analog noise filters filter the encoder inputs in the MID-7604/[...]

  • Page 20

    MID-7604/7602 Power Drive 20 ni.com Limit Switch T erminal Blocks For end-of-tra vel limit, home, inhibit in put, and inhibit output connecti ons, MID-7604/7602 axes hav e a separate, 6-position removable scre w terminal connector block. Figure 10 shows the limit switch terminal block pin assignments. Figure 10. Limit Switch T erminal Block Pin Ass[...]

  • Page 21

    © National Instruments Corporation 21 MID-7604/7602 Power Drive Figure 11. T rigger T erminal Block Pin Assignment Figure 12. Breakpoint T erminal Block Pin Assignment Analog I/O T erminal Blocks The MID-7604/7602 has two analog I/O connectors. The analog i nput connector uses a 6-pin removable terminal block, and the analog output connector uses [...]

  • Page 22

    MID-7604/7602 Power Drive 22 ni.com Accessories for Optional Use Strain-Relief Bar The strain-relief bar provid es strain relief for wiring t o the back panel terminals of the MID-7604 /7602. The arms of the strain-relief bar attach to the s ides of the MID-76 04/7602 with the thumb nuts facing upward, as shown in Figure 15. Using the provided scre[...]

  • Page 23

    © National Instruments Corporation 23 MID-7604/7602 Power Drive Panel-Mount Kit (Included) The panel-mount kit allows you to m ount the MID-7604/7602 i nside a cabinet or enclosure. Using the provided screws, attach the panel-mount kit to the rear and front set of screw holes on the side p anels of the MID-7604/7602, as sh own in Figure 16. Figure[...]

  • Page 24

    MID-7604/7602 Power Drive 24 ni.com Stepper Motor Configurations This section describes the various industry-stand ard winding configurations for stepper motors and sho ws how to connect them to a MID-7604/7602. The MID -7604/7602 is compatible with all configurations of two-phase stepper motors. Note The MID-7604/7602 is not compatible with 5-lead[...]

  • Page 25

    © National Instruments Corporation 25 MID-7604/7602 Power Drive For maximum fle xibility , y ou can connect 8-wire stepper motors in either a series or parallel configuration. Connecting the windings in series as sho wn in Figure 18 produces the most torque per amp, b ut has the disadv antage of higher inductance and poorer high-sp eed performance[...]

  • Page 26

    MID-7604/7602 Power Drive 26 ni.com Notice that an 8-wire motor wired in series is virtually identical to a 6-wire motor and typically has the same high-torque b ut lo w-speed characteristics. While a parallel configuration is not possible with a 6-wire mot or , you can usually obtain high-speed perform ance with the half-coil co nnection shown in [...]

  • Page 27

    © National Instruments Corporation 27 MID-7604/7602 Power Drive Specifications The follo wing specifications apply only to the MID-7604/7602. T o obtain a system specification, you must account for your motion controller . Refer to your controller specifications to determine o verall system specifications . Some signals have compatibility defined [...]

  • Page 28

    MID-7604/7602 Power Drive 28 ni.com Inhibit Inputs Voltage range ........................ ..................0 – 12 VDC Inhibit low voltage ................... ...............0.8 V Inhibit high voltage ........................ .........2 V Inhibit Output Voltage range ........................ ..................0 – 5V D C Output low voltage .....[...]

  • Page 29

    © National Instruments Corporation 29 MID-7604/7602 Power Drive Breakpoints ............ ......................... ....... 6-position m ini-combicon 3.81 mm plug (1 total) Triggers ............ ............... .............. ......... 6-position mini-combicon 3.81 mm plug (1 total) Analog input .................... .............. ......... 6-posit[...]

  • Page 30

    MID-7604/7602 Power Drive 30 ni.com Environment Operating temperature ................... ......... 0 to 40 º C (32 to 104 º F) Storage temperature .............. .................. – 20 to 70 º C( – 4t o1 5 8 º F) Humidity .................... .............. .............. . 10 to 90% RH, noncondensing Maximum altitude ................. ..[...]

  • Page 31

    © National Instruments Corporation 31 MID-7604/7602 Power Drive T echnical Support Resources NI We b Support National Instruments W eb support is yo ur first stop for help in solving installation, configuration, and application problems a nd questions. Online problem-solving and diagnost ic resources include frequently asked questions, knowledge b[...]