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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

System Wiring Recommendations ........................................................................................... 7

Connecting Motors ........................................................................................................... 8
Connecting Input Signals.................................................................................................. 9
FAULT Output ................................................................................................................. 11

Configuring the Drive............................................................................................................... 12

Содержание SMD-7610

Страница 1: ...ring One Power Supply 7 Regeneration 7 System Wiring Recommendations 7 Connecting Motors 8 Connecting Input Signals 9 FAULT Output 11 Configuring the Drive 12 Step 1 Selecting a Motor and Setting the Current 12 Step 2 Fine Tuning the Motor Current 13 Step 3 Setting Idle Current 14 Step 4 Load Inertia 15 Step 5 Step Size 15 Step 6 Step Pulse Type 16 Step 7 Step Pulse Noise Filter 17 Step 8 Self Tes...

Страница 2: ...persons and machinery Strictly adhere to the technical information on the installation requirements It is vital to ensure that all system components are connected to earth ground Electrical safety is impossible without a low resistance earth connection The SMD 7610 contains electrostatically sensitive components that can be damaged by incorrect handling Discharge yourself before touching the produ...

Страница 3: ...ions could result in serious bodily injury damage to the equipment or operational difficulty Block Diagram Figure 1 NI SMD 7610 Block Diagram Getting Started You need the following to use your SMD 7610 stepper drive 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 f...

Страница 4: ...irflow from a fan may be required to prevent the drive from overheating Refer to Drive Heating for more information Never use your drive in a space where there is no air flow or where other devices cause the surrounding 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 ...

Страница 5: ... serviceable fuse in your system install a fast acting 3 amp fuse in line with the power supply lead 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 ki...

Страница 6: ...he 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 power supply voltage exceeds the motor voltage the less current you ll need from the power supply A motor running fro...

Страница 7: ...hutdown 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 sh...

Страница 8: ...red on 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 Figure 5 Grounding Screw on the Chassis Four Lead Motors Four lead motors can only be configured according to the following diagram Note Motor wire colors are correct for NI stepper motors compatible with the NI SMD 7611 7612 T...

Страница 9: ...e 7 Eight Lead Motor Connected in Series Figure 8 Eight Lead Motor Connected in Parallel Connecting Input Signals The NI SMD 7610 has three input channels STEP A high speed digital input for step pulse commends 5 to 24 V logic DIR A high speed digital input for the direction signal 5 to 24 V logic EN A digital input for removing power from the motor 5 to 24 V logic Note STEP and DIR inputs can be ...

Страница 10: ...r Pin Diagram Figure 10 Internal Circuit Diagram Connection Examples The following section demonstrates example signal connections Refer to System Wiring Recommendations for cable instructions STEP and DIR Figure 11 Connecting to Indexer with Sinking Outputs ...

Страница 11: ...ity 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 ...

Страница 12: ...ries 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 curr...

Страница 13: ...at will help it dissipate heat or if the ambient temperature is expected to be high Table 2 Motor Specification Table Model Number Wiring Current Setting A Holding Torque oz in Rotor Intertia g cm2 Switch B Position ST8 1 4 leads 0 42 2 4 1 9 ST8 2 4 leads 0 42 4 4 4 0 ST11 1 4 leads 1 20 7 4 8 ST11 2 4 leads 1 20 15 3 18 ST14 1 4 leads 1 20 26 20 ST17 1 Parallel 1 61 31 38 ST17 2 Parallel 2 04 52...

Страница 14: ...o 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 vertica...

Страница 15: ...ep 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 ...

Страница 16: ...ide 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 type of signal if...

Страница 17: ...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 switc...

Страница 18: ...itch 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 Torque Speed Curves Figure 20 Torque Curve for ST8 1 with SMD 7610 Table 8 Configuring the Self Test Function on Switch A1 On Off 1 1 ...

Страница 19: ...NI SMD 7610 User Manual National Instruments 19 Figure 21 Torque Curve for ST8 2 with SMD 7610 Figure 22 Torque Curve for ST11 1 with SMD 7610 ...

Страница 20: ...20 ni com NI SMD 7610 User Manual Figure 23 Torque Curve for ST11 2 with SMD 7610 Figure 24 Torque Curve for ST14 1 with SMD 7610 ...

Страница 21: ...NI SMD 7610 User Manual National Instruments 21 Figure 25 Torque Curve for ST17 1 with SMD 7610 Figure 26 Torque Curve for ST17 2 with SMD 7610 ...

Страница 22: ...22 ni com NI SMD 7610 User Manual Figure 27 Torque Curve for ST17 3 with SMD 7610 Figure 28 Torque Curve for ST23 2 with SMD 7610 ...

Страница 23: ...NI SMD 7610 User Manual National Instruments 23 Figure 29 Torque Curve for ST23 4 with SMD 7610 Figure 30 Torque Curve for ST23 6 with SMD 7610 ...

Страница 24: ...e 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 ...

Страница 25: ...NI SMD 7610 User Manual National Instruments 25 Figure 31 Duty Cycle for the ST14 1 Figure 32 Duty Cycle for the ST17 1 ...

Страница 26: ...26 ni com NI SMD 7610 User Manual Figure 33 Duty Cycle for the ST17 2 Figure 34 Duty Cycle for the ST17 3 ...

Страница 27: ...ation and temperature rise the following information is provided Given drive power dissipation Pd versus motor refer to the figures below drive thermal constant RQ The final drive case temperature is given by TC Ta RQ Pd where Ta 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 con...

Страница 28: ...28 ni com NI SMD 7610 User Manual Mechanical Outlines Figure 36 Mechanical Dimensions Top View Figure 37 Mechanical Dimensions Front View Figure 38 Mechanical Dimensions Side View 1 2 3 4 5 6 7 8 ...

Страница 29: ...output Photodarlington 80 mA 30 VDC max Voltage drop 1 2 V max at 80 mA Dimensions 0 82 2 21 3 65 in 20 8 56 92 6 mm Weight 4 7 oz 133 g Operating temperature range 0 C to 50 C Mating connectors Motor power supply Phoenix Contact 1803617 included Signals Phoenix Contact 1840405 included Accessories Regeneration clamp NI SMD 7700 NI part number 748908 01 Alarm Codes In the event of an error the gre...

Страница 30: ... 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 ...

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