NI SMD-7610 User Manual
Contents
1. status LEDs STEP zi m ES lim Um Cio a m OUT De M _ Step Pulse Type 3 Getting Started You need the following to use your SMD 7610 stepper drive L 12 to 48 volt DC power supply Refer to Choosing a Power Supply for more information about choosing the right power supply one of the recommended motors a small flat blade screwdriver for tightening the connectors a source of step signals such as a PLC or motion controller NI SMD 7610 User Manual National Instruments 3 The connectors and other points of interest are illustrated below These are detailed later in the manual Figure 2 shows an overview of the connectors on the NI SMD 7610 stepper drive Figure 2 NI SMD 7610 Stepper Drive Connectors 4 Input and Output Signals 5 Drive Status LEDs 6 Drive Configuration DIP Switch Bank B 1 Chassis Grounding Screw 2 Motor and Power Supply Connector 3 Drive Configuration DIP Switch Bank A Mounting the Drive You can mount your drive on the wide or the narrow side of the chassis using 6 screws If possible the drive should be securely fastened to a smooth flat metal surface that will help conduct heat away from the chassis If this is not possible then forced airflow from a fan may be required to prevent the drive from overheating Refer to Drive Heating for more information e Never use your drive in a space where there is no air flow or where other devices cause the surrounding2. National Instruments corporate headquarters is located at 11500 North Mopac Expressway Austin Texas 78759 3504 National Instruments also has offices located around the world to help address your support needs For telephone support in the United States create your service request at ni com support and follow the calling instructions or dial 512 795 8248 For telephone support outside the United States visit the Worldwide Offices section of ni com niglobal to access the branch office Web sites which provide up to date contact information support phone numbers email addresses and current events Refer to the NI Trademarks and Logo Guidelines at ni com trademarks for more information on National Instruments trademarks Other product and company names mentioned herein are trademarks or trade names of their respective companies For patents covering National Instruments products technology refer to the appropriate location Help Patents in your software the patents txt file on your media or the National Instruments Patents Notice at ni com patents You can find information about end user license agreements EULAs and third party legal notices in the readme file for your NI product Refer to the Export Compliance Information at ni com legal export compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes ECCNs and other import export data 2013 National Instruments All rights rese
3. 23 Motor Heating Stepper motors convert electrical power from the driver into mechanical power to move a load Because stepper motors are not perfectly efficient some of the electrical power turns into heat on its way through the motor This heating is not so much dependent on the load being driven but rather the motor speed and power supply voltage There are certain combinations of speed and voltage at which a motor cannot be continuously operated without damage The following table and figures show the maximum duty cycle versus speed for each motor at commonly used power supply voltages Please refer to this information when planning your application A stepper motor typically reaches maximum temperature after 30 to 45 minutes of operation If you run the motor for one minute then let it sit idle for one minute that is a 50 duty cycle Five minutes on and five minutes off is also 50 duty However one hour on and one hour off has the effect of 100 duty because during the first hour the motor will reach full and possibly excessive temperature The actual temperature of the motor depends on how much heat is conducted convected or radiated out of it Our measurements were made in a 40 C 104 F environment with the motor mounted to an aluminum plate sized to provide a surface area consistent with the motor power dissipation Your results may vary Table 9 NI SMD 7610 Maximum Motor Duty Cycle Max Duty Max Duty Cycle at 40 C
4. 10 VDC Over voltage shutdown 52 VDC MOLOE CUT CIN auo eer eta obere qtia eade egende 0 3 to 2 2 A Feat tesioo diio eite te et diderded Digital MOSFET 16 kHz PWM Digital Inputs ISO AHOD onde t seta an Bn har Naa te Optical isolated Digital logic levels Minimum ON 4 VDC Maximum 30 VDC up CUTE IE oso crbe ae atto stat ences 5 mA typical at 4 VDC 15 mA typical at 30 VDC Maximum pulse frequency 150 kHz or 2 MHz set by switch Minimum pulse width 3 usec at 150 kHz setting 0 25 usec at 2 MHz setting PL ut DUE cascos tuto eecsacstevebe pita ates Photodarlington 80 mA 30 VDC max Voltage Crops cnan aecenas e so ee uet 1 2 V max at 80 mA ITM ENSTONS ERE 0 82 x 2 21 x 3 65 in 20 8 x 56 x 92 6 mm MeIDBE e d datei eee NS a uta Pert Oe 4 7 oz 133 g Operating temperature range 0 C to 50 C Mating connectors Motor power supply eseese Phoenix Contact 1803617 included I OMAIS iecietectea eiae Due AD Phoenix Contact 1840405 included Accessories Regeneration clamp sssss NI SMD 7700 NI part number 748908 01 Alarm Codes In the event of an error the green LED on the main board will flash one or two times followed by a series of red flashes The pattern repeats until the alarm is cleared Table 10 Status LED Blink Code Definitions Solid gre
5. Ambient at 40 Max Duty Cycle at 40 C Ambient Ambient Current oc onnecuon is 12 pees 24 VDC 48 VDC STI 4l 1004 1009 ML Se Ree NR The given power supply voltage is not recommended for this motor 24 nicom NISMD 7610 User Manual Figure 31 Duty Cycle for the ST 14 1 1 2 Amps phase 40 C ambient temp on 4 75 x 4 75 x 25 Aluminum Plate B 80 P 20 D 5 10 15 20 25 30 35 40 Speed RPS Figure 32 Duty Cycle for the ST17 1 12V 2 04 A phase parallel connected 34V 40 C ambient temp BV on 4 75 x 4 75 x 25 Aluminum Plate oy NG LLLA BD g 80 e i 20 10 18 20 25 aD 35 40 Speed RPS NI SMD 7610 User Manual National Instruments 25 Figure 33 Duty Cycle for the ST17 2 4 2 04A phase parallel connected 34V 40 C ambient temp ii on 4 75 x 4 75 x 25 Aluminum Plate 7100 NI Lf l amp D g 60 40 20 Oo 5 10 18 20 2 3n 35 40 Speed RPS Figure 34 Duty Cycle for the ST17 3 lv 2 04A phase parallel connected 34V 40 C ambient temp ABy on 4 75 x 4 75 x 25 Aluminum Plate 100 Nee 5 10 15 20 25 30 35 40 Duty Cycle 5 26 nicom NI SMD 7610 User Manual Drive Heating While NI SMD 7610 devices efficiently transmit power between the power supply and motor they do generate some heat in the process This will cause the temperature of the drive to rise above the surrounding air temperature and m
6. on the degree of enclosure protection the product can have bare components that are live or have hot surfaces Control and power cables can carry a high voltage even when the motor is not rotating e Never pull out or plug in the product while the system is live There is a danger of electric arcing and danger to persons and contacts e After powering down the product wait at least ten minutes before touching live sections of the equipment or undoing connections e g contacts screwed connections Capacitors can store dangerous voltages for long periods of time after power has been switched off To be safe measure the contact points with a meter before touching Be alert to the potential for personal injury Follow the recommended precautions and safe operating practices Safety notices in this manual provide important information Read and be familiar with these instructions before attempting installation operation or maintenance The 2 nicom NI SMD 7610 User Manual purpose of this section is to alert users to possible safety hazards associated with this equipment and the precautions that need to be taken to reduce the risk of personal injury and damage to the equipment Failure to observe these precautions could result in serious bodily injury damage to the equipment or operational difficulty Block Diagram Figure 1 NI SMD 7610 Block Diagram 12 48 VDC from external power supply A fe RE 1 oy al 1 Dy Regulators
7. USER MANUAL NI SMD 7610 This manual describes the NI SMD 7610 stepper motor drive It describes electrical and mechanical characteristics of the device as well as I O functionality Contents vie AM Oma O EE E N EEE 2 Blo ED A a EE E EE E E 3 E i o i ERER EA A AAE E E O AEEA TEET EEEE E O E 3 Moonie he DIY RS CRT EE EE 4 Connecting the Power Supply csreisiscesrarseouiessddrresser EP estt dora dete d peat vae eee shebeetelgucciodesdacsee 5 Choosing a Power Supply ccrccececececzcccececcesacsansacegsccdecicaseenzbacasgiedecccethectedenaseeeadeiesedehadenleedseasdeaeees 6 R 1 T AE E EE Oe A AE AA A T A ANE TETE 6 RS E E A E E E E T T T 6 Multiple Drives Sharing One Power Supply ccccccccccccccceecsseeesssssneeeeeeeeecesceseeesssnseaaes 7 Rezen aO sersscs cise aenes parse E 7 System Wiring Recommendations cccccccccccccceecsseessssceceeeeeceeeeseeeseeessaeeeeeeeeceeeseeseesssseaeaes T one A NO E ee 8 Connecine Input ON asic tse cence EEEE ER exustus E EERIE 9 FAUCET OUTE honie eee 11 ern edd eua load sccm DIV ROS ET NR eet eee eS 12 Step 1 Selecting a Motor and Setting the Current esses 12 Step 2 Fine Tuning the Motor Current sss 13 Step 3 Seine Tale C UtFetil eo ome ane eee ene eee eon eae luni suadeo nee ne eee nee 14 Bebe A Load IMEA siisi E a aa ganeeaeenedecascessoue 15 wils tS oo o o IAS NN PTT 15 pleno Step Pulse EVE eesseateseinvtismesantu
8. air to be more than 50 C Never put the drive where it can get wet or where metal or other electrically conductive particles can get on the circuitry Always provide air flow around the drive When mounting multiple drives near each other maintain at least one half inch of space between drives 4 ni ccom NI SMD 7610 User Manual Connecting the Power Supply If you need information about choosing a power supply refer to the Choosing a Power Supply section e Connect the power supply terminal to the connector terminal labeled V ee 99 e Connect power supply to the connector terminal labeled V e Connect the green ground screw on the corner of the chassis to earth ground e Use 18 or 20 gauge wire The NI SMD 7610 contains an internal fuse that connects to the power supply terminal This fuse is not user replaceable If you want to install a user serviceable fuse in your system install a fast acting 3 amp fuse in line with the power supply lead N Caution Do not reverse the wires Reverse connection will destroy your drive and void your warranty Figure 3 Power Supply and Ground Connections If you plan to use a regulated power supply you may encounter a problem with regeneration If you rapidly decelerate a load from a high speed much of the kinetic energy of that load is transferred back to the power supply This can trip the overvoltage protection of a switching power supply causing it to shut do
9. and DIR Figure 11 Connecting to Indexer with Sinking Outputs 10 nicom NISMD 7610 User Manual Enable Input Connecting the Enable input as shown in Figure 12 causes the drive to disable when the relay is closed and enable when the relay is open Figure 12 Connecting Enable to a Switch or Relay m m COMO 524 VDC switch or relay DRIVE Power closed logic low 3 Connecting the Enable signal as shown in Figure 13 causes the drive to disable when the proximity sensor activates Figure 13 Connecting an NPN Type Proximity Sensor to an Input FAULT Output The NI SMD 7610 has a digital FAULT output This output closes to signal a fault condition This output can be used to drive LEDs relays or the inputs of other electronic devices like PLCs The collector and emitter terminals of the output transistor are available at the connector This allows you to configure the output for current sourcing or sinking Refer to the following diagrams to configure the FAULT output N Caution Do not connect the output to more than 30 VDC The current through the output terminal must not exceed 80 mA Figure 14 FAULT Output Circuit Diagram NI SMD 7610 User Manual National Instruments 11 Figure 15 FAULT Output Configured for Sinking 5 24 VOC Power Supply 5 24 VDC Power Supply TT Configuring the D
10. ation and operation of your equipment These codes vary from area to area and it is your responsibility to determine which codes should be followed and to verify that the equipment installation and operation are in compliance with the latest revision of these codes Equipment damage or serious injury to personnel can result from the failure to follow all applicable codes and standards We do not guarantee the products described in this publication are suitable for your particular application nor do we assume any responsibility for your product design installation or operation e Read all available documentation before assembly and commissioning Incorrect handling of products in this manual can result in injury and damage to persons and machinery strictly adhere to the technical information on the installation requirements e tis vital to ensure that all system components are connected to earth ground Electrical safety is impossible without a low resistance earth connection e The SMD 7610 contains electrostatically sensitive components that can be damaged by incorrect handling Discharge yourself before touching the product Avoid contact with high insulating materials artificial fabrics plastic film etc Place the product on a conductive surface e During operation keep all covers and cabinet doors shut Otherwise there are deadly hazards that could possibly cause severe damage to health or the product e noperation depending
11. ay also require that the drive be mounted to a heat conducting metal surface To calculate the power dissipation and temperature rise the following information is provided Given drive power dissipation P4 versus motor refer to the figures below drive thermal constant Ro The final drive case temperature is given by Tc 7 T Ro X Pa where T is the ambient temperature of the surrounding air The case of the drive should not be allowed to exceed 70 C or the life of the product could be reduced Drive thermal constant Narrow side of drive mounted on a 3 5 x 13 5 in steel plate 0 070 in thick Rg 1 84 C W Narrow side of drive mounted on a non heat conducting surface Rg 3 99 C W Figure 35 Drive Thermal Losses matar current A NI SMD 7610 User Manual National Instruments 27 Mechanical Outlines Figure 36 Mechanical Dimensions Top View Soo Deed S7 Bub T T e e 122 34 5 eor eo L 0 14 3 5 EPLL t 0 42 10 5 MATING CUNNECTUOR REF Figure 37 Mechanical Dimensions Front View 0 18 44 5 3 45 87 6 gt P CS 0 44 11 3 USU Lie 0 98 14 6 0 86 L21 8 0 19 4 8 0 94 e3 0 92 lese Figure 38 Mechanical Dimensions Side View Use Leg Cj I 28 nicom NISMD 7610 User Manual Technical Specifications Amplifier SUDDIV VOlldPO Gaudi bt ome tst 12 to 48 VDC Under voltage alarm
12. ch as 200 steps rev full step and 400 steps rev half step motors run a little rough and produce more audible noise than when they are microstepped 2000 steps rev and beyond The NI SMD 7610 drives include a feature called microstep emulation also called step smoothing that can provide smooth motion when using full steps or half steps By selecting 200 smooth or 400 smooth this feature is automatically employed to provide the smoothest possible motion when using full steps or half steps NI SMD 7610 User Manual National Instruments 15 Table 6 Configuring Step Size on Switches A6 A7 and A8 Switch position Because a command filter is used as part of the step smoothing process there will be a slight delay in the motion If this delay is unsuitable for your application please choose the non filtered setting 200 or 400 The following figure shows an example ofthe delay that can occur from using the step smoothing filter Figure 18 Delay Due to Filtering revisec Step 6 Step Pulse Type Most indexers and motion controllers provide motion commands in the Step and Direction format The Step signal pulses once for each motor step and the direction signal commands direction Some PLCs may use a different type of command signal one signal pulses once for each desired step in the clockwise direction STEP CW while a second signal pulses for counterclockwise motion STEP CCW The NI SMD 7610 drives can accept this
13. de i iud Beside epa e 16 Sep 7 Step Pulse Noise Piller aote eerte etti unc De cerise Eee susa dba enen es ca Onda 17 wii MEI PM 18 TOROS Polos s BERT RTT m 18 hie royal a SA Ua e 24 Pive T UT a puse c umet tanum cete titu css sns bees eU eic uM REM LE DM inRALIE 27 Mechanica OULES a assise atis ts aei ess qut des sr bbvn DATES vier iade tiU UU Iano SH DM bebU s Ia Pe baia UE EU A DES RU 28 Techical SS CTC RO DI RERO RP 29 VATABRUCC OG cee eue enna ern ee od peas mda rarer Or Dre b rd abe dedii Dec un Passes b Rd en oC d eed ear nena ter See wer eer ae 29 Worldwide Support and Services c cccccccccccccesscssessnseceeeeeececeeeeseessesaeeeeeeeeeeeeeseeeeeessaaeeeeeeeeees 30 b d NATIONAL p INSTRUMENTS Safety Information Only qualified personnel are permitted to transport assemble commission and maintain this equipment Properly qualified personnel are persons who are familiar with the transport assembly installation commissioning and operation of motors and who have the appropriate qualifications for their jobs The qualified personnel must know and observe the following standards and regulations e JEC 364 resp CENELEC HD 384 or DIN VDE 0100 e IEC report 664 or DIN VDE 0110 e National regulations for safety and accident prevention or VBG 4 To minimize the risk of potential safety problems you should follow all applicable local and national codes that regulate the install
14. en No alarm motor disabled Flashing green No alarm motor enabled NI SMD 7610 User Manual National Instruments 29 Table 10 Status LED Blink Code Definitions Continued 3 red 2 green Internal voltage out of range 4 red 1 green Power supply voltage too high 5 red 1 green Over current short circuit 6 reds 1 green Open motor winding Worldwide Support and Services 4 red 2 green Power supply voltage too low The National Instruments Web site is your complete resource for technical support At ni com support you have access to everything from troubleshooting and application development self help resources to email and phone assistance from NI Application Engineers Visit ni com services for NI Factory Installation Services repairs extended warranty calibration and other services Visit ni com register to register your National Instruments 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 Council of the European Communities using the manufacturer s declaration of conformity This system affords the user protection for electromagnetic compatibility EMC and product safety You can obtain the DoC for your product by visiting ni com certification If your product supports calibration you can obtain the calibration certificate for your product at ni com calibration
15. itches A4 and A5 on the front of the SMD 7610 drive are used to set the percent of rated current that will be applied to the motor Refer to the table below to configure the switches Table 3 Configuring Current on Switch A4 and A5 Step 3 Setting Idle Current Motor heating and power consumption can also be reduced by lowering the motor current when it is not moving The SMD 7610 will automatically lower the motor current when it is idle to either 50 or 90 of the running current The 50 idle current setting will lower the holding torque to 50 which is enough to prevent the load from moving in most applications This reduces motor heating by 75 In some applications such as those supporting a vertical load it is necessary to provide a high holding torque In such cases the idle current can be set to 90 as shown below The idle current switch is located in switch bank A on the front of the SMD 7610 To set the idle current to 50 place Switch A3 in the down position To set the idle current to 90 place switch A3 in the up position Table 4 Configuring Idle Current on Switch A3 14 nicom NI SMD 7610 User Manual Step 4 Load Inertia The SMD 7610 includes anti resonance and electronic damping features which greatly improve motor performance To perform optimally the drive must understand the electromechanical characteristics of the motor and load Most of this is done automatically when you select the motor using swi
16. quency Table 7 Configuring the Step Pulse Noise Filter on Switch A2 NI SMD 7610 User Manual National Instruments 17 Step 8 Self Test If you are having trouble getting your motor to turn you may want to try the built in self test Setting switch A1 to the ON position causes the drive to automatically rotate the motor back and forth 2 5 turns in each direction This feature can be used to confirm that the motor is correctly wired selected and otherwise operational Table 8 Configuring the Self Test Function on Switch A1 Torque Speed Curves Figure 20 Torque Curve for ST8 1 with SMD 7610 Connection 4 leads 12 VDC 24 VDC Drive settings 0 42A phase 20000 steps rev 2 5 2 1 8 E 1 0 5 0 5 10 15 20 25 30 35 40 rps 18 nicom NISMD 7610 User Manual Figure 21 Torque Curve for ST8 2 with SMD 7610 Connection 4 leads 1i12 VDC 24 VDC Drive settings 0 42A phase 20000 steps rev 2 5 2 E 5 1 5 1 0 5 0 0 5 10 15 20 25 30 35 40 rps Figure 22 Torque Curve for ST11 1 with SMD 7610 Connection 4 leads 712 VDC 74 VDC Drive settings 1 2A phase 20000 steps rev oz in NI SMD 7610 User Manual National Instruments 19 Figure 23 Torque Curve for ST11 2 with SMD 7610 Connection 4 leads 12 VDC 324 VDC Drive settings 1 2A phase 20000 steps rev 14 12 10 oz in e 0 5 10 15 20 25 30 35 40 Figure 24 Torque Cu
17. r supply voltage exceeds the motor voltage the less current you ll need from the power supply A motor running from a 48 volt supply can be expected to draw only half the supply current that it would with a 24 volt supply We recommend the following selection procedure 1 Ifyou plan to use only a few drives get a power supply with at least twice per phase current rating ofthe stepper motor Example for a motor that s rated for 2 A phase use a 4 A power supply 2 Ifyou are designing for mass production and must minimize cost get one power supply with more than twice the rated current of the motor Install the motor in the application and monitor the current coming out of the power supply and into the drive at various motor loads This will tell you how much current you really need so you can design in a lower cost power supply 6 nicom NI SMD 7610 User Manual Table 1 lists the maximum current required for each motor at several common power supply voltages Please consider this information when choosing a power supply Table 1 NI SMD 7610 Cm me xw opm em ow sm see o oes ww Na sme see m ow e Na Multiple Drives Sharing One Power Supply You can use one power supply to power multiple drives When powering multiple drives ensure that the power supply s maximum current output is greater than the sum of the maximum current requirements for all connected drives Hegeneration When a motor rapidly decelera
18. rive This section contains a series of steps to configure the NI SMD 7610 Step 1 Selecting a Motor and Setting the Current The NI SMD 7610 is optimized for use with NI motors To select a motor move switches B1 B2 and B3 to the setting that corresponds to the motor of your choice You can do this while power is on but it is safer to select the motor before applying power to the drive so that you do not risk applying too much current to the motor 12 nicom NI SMD 7610 User Manual Table 2 Motor Specification Table Holding Rotor Model Current Torque Intertia Switch B Number Setting A oz in Position 4 leads 4 leads 4 leads Parallel Parallel Parallel Step 2 Fine Tuning the Motor Current The maximum current for the motor is set when Switch B is configured to select a motor You may want to reduce the current to save power or lower motor temperature This is important if the motor is not mounted to a surface that will help it dissipate heat or if the ambient temperature is expected to be high NI SMD 7610 User Manual National Instruments 13 Stepper motors produce torque in direct proportion to current but the amount of heat generated is roughly proportional to the square of the current If you operate the motor at 90 of rated current you ll get 90 of the rated torque but the motor will produce approximately 81 as much heat At 70 current the torque is reduced to 70 and the heating to about 50 Sw
19. rve for ST14 1 with SMD 7610 Connection 4 leads 12 VDC 24 VDC Drive settings 1 2A phase 20000 stepsirev 25 i 20 nicom NI SMD 7610 User Manual Figure 25 Torque Curve for ST17 1 with SMD 7610 Connection parallel 12 VDC 24 VDC 48 VDC Drive settings 1 61A phase 20000 steps rev 20 15 oz in 10 rps Figure 26 Torque Curve for ST17 2 with SMD 7610 Connection parallel 12 VDC 24 VDC 48 VDC Drive settings 2 04A phase 20000 steps rev 10 20 30 40 50 NI SMD 7610 User Manual National Instruments 21 60 22 ni com Figure 27 Torque Curve for ST17 3 with SMD 7610 12 VDC 24VDC 48 VDC Connection parallel Drive settings 2 04A phase 20000 steps rav 10 20 30 40 50 rps Figure 28 Torque Curve for ST23 2 with SMD 7610 Connection series 12 VDC 24 VDC 48 VDC Drive settings 2 2A phase 20000 steps rev NI SMD 7610 User Manual Figure 29 Torque Curve for ST23 4 with SMD 7610 Connection series 12 VDC 24 VDC 48 VDC Drive settings 2 2A phase 20000 steps rev 160 140 120 100 80 oz in 60 40 20 rps Figure 30 Torque Curve for ST23 6 with SMD 7610 Connection series 12 VDC 24 VDC 48 VDC Drive settings 2 2A phase 20000 steps rev 0 10 20 30 40 50 NI SMD 7610 User Manual National Instruments
20. rved 374106A 01 Aug13
21. s are correct for NI stepper motors compatible with the NI SMD 7611 7612 These wire colors may not match a third party stepper motor Figure 6 Four Lead Motor Connection NI SMD 7610 User Manual Eight Lead Motors Eight lead motors can be connected in series or parallel A series connected motor needs less current than one that is connected in parallel but it will not be able to run as fast Refer to the wiring diagrams below to connect an eight lead motor Figure 7 Eight Lead Motor Connected in Series Ac Org Wht 5 Blk Wht Orange Black Red Red yey Yellow pg Wht Wht p Figure 8 Eight Lead Motor Connected in Parallel K vel ant E Connecting Input Signals The NI SMD 7610 has three input channels e STEP A high speed digital input for step pulse commends 5 to 24 V logic e DIR A high speed digital input for the direction signal 5 to 24 V logic e EN A digital input for removing power from the motor 5 to 24 V logic Note STEP and DIR inputs can be converted to STEP CW and STEP CCW by configuring the internal jumper Refer to Step 6 Step Pulse Type for information NI SMD 7610 User Manual National Instruments 9 Figure 9 Input Connector Pin Diagram c c eco SHomSS UD Figure 10 Internal Circuit Diagram Connection Examples The following section demonstrates example signal connections Refer to System Wiring Recommendations for cable instructions STEP
22. tches B1 B2 and B3 To further enhance performance you must set switch B4 to indicate the approximate inertia ratio of the load and motor The ranges are 0 to 4X and 5 to 10X The motors table shown in Step 1 of this section includes the rotor inertia of each motor Please divide the load inertia by the rotor inertia to determine the ratio Set switch B4 in the down position to configure a ratio of 5X to 10X Set switch B4 in the up position to configure a ratio of 0 to 4X Table 5 Configuring Load Inertia on Switch B4 5 to 10X step 5 Step Size The SMD 7610 requires a source of step pulses to command motion This may be a PLC an indexer a motion controller or another type of device The only requirement is that the device be able to produce step pulses whose frequency is in proportion to the desired motor speed and be able to smoothly ramp the step speed up and down to produce smooth motor acceleration and deceleration Smaller step sizes result in smoother motion and more precise speed but also require a higher step pulse frequency to achieve maximum speed The smallest step size of the SMD 7610 is 1 20 000th of a motor turn To command a motor speed of 50 revolutions per second 3000 rpm the step pulses frequency must be 50 x 20 000 1 MHz Six different settings are provided in the SMD 7610 drive as shown in the table on the next page Choose the one that best matches the capability of your system At lower step resolutions su
23. tes from high speed under load the kinetic energy may be reconverted into electrical energy and transferred back to the power supply When using regulated power supplies this can trip the overvoltage protection and lead to a shutdown or cause damage to the system Unregulated power supplies do not typically have overvoltage protection and may store regenerated energy in capacitors system Wiring Recommendations Maintain at least 2 in separation between the power supply cable and input lines or encoder feedback All power supply cables should be properly shielded and the shield grounded at the power supply Signal cables should be shielded and grounded as close as possible to the signal source NI SMD 7610 User Manual National Instruments 7 8 ni com Connecting Motors A The following section explains how to connect motors to the NI SMD 7610 Refer to your motor documentation for any special considerations that may affect your configuration N Caution Never connect or disconnect the motor while the system is powered on ea Note Ensure any shield or grounding strap on the motor is connected to the chassis ground screw located near the motor power connector Figure 4 Motor Power Connector MOTOR eoe I Peo iF i t i Figure 5 Grounding Screw on the Chassis Four Lead Motors Four lead motors can only be configured according to the following diagram Ee Note Motor wire color
24. type of signal if you remove the drive cover and move jumper S3 from the default position on pins 1 and 2 to 16 nicom NI SMD 7610 User Manual the 1 3 position In STEP CW STEP CCW mode the CW signal should be connected to the STEP input and the CCW signal to the DIR input Configure the jumper as shown in Figure 19 Figure 19 Step Pulse Type Jumper STEP CW amp STEP CCW Step 7 Step Pulse Noise Filter Electrical noise can affect the STEP signal in a negative way causing the drive to think that one step pulse is two or more pulses This results in extra motion and inaccurate motor and load positioning To combat this problem the NI SMD 7610 drives include a digital noise filter on the STEP and DIR inputs There are two settings for this filter 150 kHz and 2 MHz 150 kHz works well for most applications If you are operating the SMD 7610 at a high number of steps rev and at high motor speeds you may be commanding the drive at step rates above 150 kHz In such cases you should use the 2 MHz setting as shown below The step noise filter is controlled by switch A2 To set the filter frequency to 150 kHz set switch A2 in the down position To set the filter frequency to 2 MHz set switch A2 to the up position Your maximum pulse rate will be the highest motor speed multiplied by the steps rev For example 40 revs second at 20 000 steps rev is 40 x 20 000 800 kHz Consider this when deciding if you must increase the filter fre
25. wn NI offers the SMD 7700 regeneration clamp to solve this problem If in doubt buy an SMD 7700 for your first installation If the regen LED on the SMD 7700 never flashes you don t need the clamp NI SMD 7610 User Manual National Instruments 5 Choosing a Power Supply When choosing a power supply there are many things to consider If you are manufacturing equipment that will be sold to others you probably want a supply with all the safety agency approvals If size and weight are an issue get a switching supply And you must decide what size of power supply in terms of voltage and current is needed for your application National Instruments offers two powers supplies that are excellent matches for the NI SMD 7610 drive PS 12 24V 6 3A and PS 13 48V 6 7A Voltage The motor can provide more torque at higher speeds if a higher power supply voltage is used Refer to the Torque Speed Curves section for guidance If you choose an unregulated power supply make sure the no load voltage of the supply does not exceed the drive s maximum input voltage specification Current The maximum supply current you could ever need is two times the motor current However you will generally need a lot less than that depending on the motor type voltage speed and load conditions That s because the NI SMD 7610 uses a switching amplifier converting a high voltage and low current into lower voltage and higher current The more the powe
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