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USER MANUAL
NI SMD-7611/7612
This manual contains information about the configuration and use of the National Instruments
SMD-7611 and SMD-7612. They are referred to inclusively as the NI SMD-7611/7612.
Functionality on these devices are roughly equivalent. The NI SMD-7611 operates from 24 to
48 VDC, and has a running current of up to 4.5 A per phase. The SMD-7612 operates from 24 to
60 VDC, and runs current up to 7.8 A per phase.
Contents
Safety Information .................................................................................................................... 2
Block Diagram.......................................................................................................................... 3
Getting Started.......................................................................................................................... 3
Mounting the Drive .................................................................................................................. 4
Connecting the Power Supply .................................................................................................. 4
Drive CE Requirements............................................................................................................ 5
Choosing a Power Supply......................................................................................................... 5
Voltage.............................................................................................................................. 6
Current .............................................................................................................................. 6
Regeneration..................................................................................................................... 8
System Wiring Recommendations ........................................................................................... 8
Connecting Motors ........................................................................................................... 8
Connecting Input Signals.................................................................................................. 10
FAULT Output ......................................................................................................................... 13
Configuring the Drive............................................................................................................... 14
Step 1: Selecting a Motor and Setting the Current ........................................................... 14
Step 2: Fine Tuning the Motor Current ............................................................................ 16
Step 3: Setting Idle Current .............................................................................................. 17
Step 4: Load Inertia .......................................................................................................... 17
Step 5: Step Size ............................................................................................................... 18
Step 6: Step Pulse Type .................................................................................................... 19
Step 7: Step Pulse Noise Filter ......................................................................................... 20
Step 8: Self Test................................................................................................................ 21
Torque Speed Curves................................................................................................................ 21
Motor Heating........................................................................................................................... 28
Drive Heating ........................................................................................................................... 39
Mechanical Outline................................................................................................................... 40
Technical Specifications........................................................................................................... 41
Alarm Codes ............................................................................................................................. 42
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Summary of Contents for NI SMD-7611
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Page 1: Table Of Contents
SMD-7611 and SMD-7612. They are referred to inclusively as the NI SMD-7611/7612. Functionality on these devices are roughly equivalent. The NI SMD-7611 operates from 24 to 48 VDC, and has a running current of up to 4.5 A per phase. The SMD-7612 operates from 24 to 60 VDC, and runs current up to 7.8 A per phase. -
Page 2: Safety Information
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 | ni.com | NI SMD-7611/7612 User Manual... -
Page 3: Block Diagram
Getting Started You need the following to use your NI SMD-7611/7612 stepper drive: a 12 to 48 VDC power supply (60 V max for NI SMD-7612). Refer to Choosing a Power Supply for help in choosing the right power supply ... -
Page 4: Mounting The Drive
• Use 18 or 20 gauge wire. The NI SMD-7611/7612 drives contain 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 fuse in line with the + power supply lead. -
Page 5: Drive Ce Requirements
This can trip the overvoltage protection of a switching power supply, causing it to shut down. 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. -
Page 6: Voltage
That’s because the NI SMD-7611/7612 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. - Page 7 Max Power Supply Current (A) Drive Current (A), Switch Motor peak of sine 24 VDC 48 VDC 60 VDC Reserved for custom motors ST23-8 ST23-1 ST23-4 ST23-6 ST24-1 3.36 ST24-2 ST24-3 ST34-2 ST34-5 ST34-8 NI SMD-7611/7612 User Manual | © National Instruments | 7...
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Page 8: Regeneration
Connecting Motors This section explains how to connect motors to the NI SMD-7611/7612. Refer to your motor documentation for any special considerations that may affect your configuration. Never connect or disconnect the motor while the system is powered on. - Page 9 Four lead motors can only be configured according to the following diagram. Motor wire colors are correct for NI stepper motors compatible with the Note NI SMD-7611/7612. These wire colors may not match a third-party stepper motor. Figure 6. Four Lead Motor Connection Eight Lead Motors Eight lead motors can be connected in series or parallel.
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Page 10: Connecting Input Signals
STEP and DIR inputs can be converted to STEP CW and STEP CCW by Note configuring the internal jumper. Refer to Step 6: Step Pulse Type for more information. Figure 9. Input Connector Pin Diagram 10 | ni.com | NI SMD-7611/7612 User Manual... - Page 11 The following section demonstrates example signal connections. Refer to System Wiring Recommendations for cable instructions. STEP and DIR Figure 11. Connecting to Indexer with Sourcing Outputs Figure 12. Connecting to Indexer with Sinking Outputs NI SMD-7611/7612 User Manual | © National Instruments | 11...
- Page 12 Figure 15. Connecting a Second Drive to EN Connecting the Enable signal as shown in Figure 16 causes the drive to disable when the proximity sensor activates. Figure 16. Connecting an NPN Type Proximity Sensor to an Input 12 | ni.com | NI SMD-7611/7612 User Manual...
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Page 13: Fault Output
Figure 17. Connecting a PNP Type Proximity Sensor to an Input FAULT Output The NI SMD-7611/7612 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. -
Page 14: Configuring The Drive
Step 1: Selecting a Motor and Setting the Current The NI SMD-7611/7612 is optimized for use with NI motors. To select a motor, move the rotary switch 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. - Page 15 Table 4. SMD-7612 Motor Specification Table Drive Current Rotor Model (A), peak of Holding Intertia Number Wiring sine Torque (oz-in.) (g-cm Switch Reserved for custom motors ST23-8 Parallel 35.4 ST23-1 Parallel 76.6 ST23-4 Parallel NI SMD-7611/7612 User Manual | © National Instruments | 15...
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Page 16: Step 2: Fine Tuning The Motor Current
At 70% current, the torque is reduced to 70% and the heating to about 50%. Switches 1 and 2 on the front of the SMD-7611/7612 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. -
Page 17: 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-7611/7612 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. -
Page 18: Step 5: Step Size
Step 5: Step Size The SMD-7611/7612 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. -
Page 19: Step 6: Step Pulse Type
(STEP CW), while a second signal pulses for counterclockwise motion (STEP CCW). The SMD-7611/7612 drives can accept this type of signal if you remove the drive cover and move jumper S3 from the default position on pins 1 and 2 to the 1-3 position. -
Page 20: Step 7: Step Pulse Noise Filter
DIR inputs. There are two settings for this filter: 150 kHz and 2 MHz. 150 kHz, the factory default, works well for most applications. If you are operating the SMD-7611/7612 at a high number of steps/rev and at high motor speeds, you may be commanding the drive at step rates above 150 kHz. -
Page 21: Step 8: Self Test
Table 9 shows the DIP switch positions. Table 9. Configuring the Self Test Function on Switch 8 Torque Speed Curves Figure 25. Torque Curve for ST17 with SMD-7611 at 24 V ST17 with SMD-7611 ST17-1 ST17-2... - Page 22 Figure 26. Torque Curve for ST17 with SMD-7611 at 48 V ST17-1 ST17 with SMD-7611 ST17-2 ST17-3 ST17-4 Figure 27. Torque Curve for ST23 with SMD-7611/7612 at 24 V ST23 with SMD-7611/7612 ST23-1 (SMD-7611) ST23-4 (SMD-7611) ST23-6 (SMD-7611) ST23-8 (SMD-7612)
- Page 23 Figure 28. Torque Curve for ST23 with SMD-7611/7612 at 48 V ST23-1 (SMD-7611) ST23 with SMD-7611/7612 ST23-4 (SMD-7611) ST23-6 (SMD-7611) ST23-8 (SMD-7612) Figure 29. Torque Curve for ST24 with SMD-7612 at 24 V ST24 with SMD-7611 ST24-1 ST24-2 ST24-3 NI SMD-7611/7612 User Manual | © National Instruments | 23...
- Page 24 Figure 30. Torque Curve for ST24 with SMD-7612 at 48 V ST24 with SMD-7611 ST24-1 ST24-2 ST24-3 Figure 31. Torque Curve for ST34 with SMD-7611 at 48 V ST34 with SMD-7611 ST34-1 ST34-2 ST34-4 ST34-5 24 | ni.com | NI SMD-7611/7612 User Manual...
- Page 25 Figure 32. Torque Curve for ST34-1, ST34-4, and ST34-7 with SMD-7612 at 24 V ST34 with SMD-7612 ST34-1 ST34-4 ST34-7 Figure 33. Torque Curve for ST34-1, ST34-4, and ST34-7 with SMD-7612 at 48 V ST34 with SMD-7612 ST34-1 ST34-4 ST34-7 NI SMD-7611/7612 User Manual | © National Instruments | 25...
- Page 26 Figure 34. Torque Curve for ST34-1, ST34-4, and ST34-7 with SMD-7612 at 60 V ST34 with SMD-7612 ST34-1 ST34-4 ST34-7 Figure 35. Torque Curve for ST34-2, ST34-5, and ST34-9 with SMD-7612 at 24 V ST34 with SMD-7612 ST34-2 ST34-5 ST34-8 26 | ni.com | NI SMD-7611/7612 User Manual...
- Page 27 Figure 36. Torque Curve for ST34-2, ST34-5, and ST34-9 with SMD-7612 at 48 V ST34 with SMD-7612 ST34-2 ST34-5 ST34-8 Figure 37. Torque Curve for ST34-2, ST34-5, and ST34-9 with SMD-7612 at 60 V ST34 with SMD-7612 ST34-2 ST34-5 ST34-8 NI SMD-7611/7612 User Manual | © National Instruments | 27...
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Page 28: Motor Heating
ST24-2 4 leads 100% See chart ST24-3 4 leads 100% See chart ST34-2 Series 100% 100% ST34-5 Series See chart See chart ST34-1 Series 3.816 100% 100% ST34-4 Series 3.816 100% 100% 28 | ni.com | NI SMD-7611/7612 User Manual... - Page 29 Parallel 7.56 100% 100% See chart ST34-7 Parallel 6.72 100% 100% 100% Figure 38. Duty Cycle for the ST17-1 with the SMD-7611 ST17-1 Max Duty Cycle vs Speed 48 VDC NI SMD-7611/7612 User Manual | © National Instruments | 29...
- Page 30 Figure 39. Duty Cycle for the ST17-2 with the SMD-7611 ST17-2 Max Duty Cycle vs Speed 48 VDC Figure 40. Duty Cycle for the ST17-3 with the SMD-7611 ST17-3 Max Duty Cycle vs Speed 48 VDC Figure 41. Duty Cycle for the ST17-4 with the SMD-7611...
- Page 31 Figure 42. Duty Cycle for the ST23-1 with the SMD-7611 ST23-1 Max Duty Cycle vs Speed SMD-7611 48 VDC Figure 43. Duty Cycle for the ST23-1 with the SMD-7612 ST23-1 Max Duty Cycle vs Speed SMD-7612 60 VDC Figure 44. Duty Cycle for the ST23-4 with the SMD-7612 at 48 VDC...
- Page 32 Figure 46. Duty Cycle for the ST23-6 with the SMD-7612 at 48 VDC ST23-6 Max Duty Cycle vs Speed SMD-7612 48 VDC Figure 47. Duty Cycle for the ST23-6 with the SMD-7612 at 60 VDC ST23-6 Max Duty Cycle vs Speed SMD-7612 60 VDC 32 | ni.com | NI SMD-7611/7612 User Manual...
- Page 33 ST23-8 Max Duty Cycle vs Speed SMD-7612 60 VDC Figure 50. Duty Cycle for the ST24-1 with the SMD-7612 at 60 VDC ST24-1 Max Duty Cycle vs Speed SMD-7612 60 VDC NI SMD-7611/7612 User Manual | © National Instruments | 33...
- Page 34 Figure 52. Duty Cycle for the ST24-2 with the SMD-7612 at 60 VDC ST24-2 Max Duty Cycle vs Speed SMD-7612 60 VDC Figure 53. Duty Cycle for the ST24-3 at 48 VDC ST24-3 Max Duty Cycle vs Speed 48 VDC, 4.8A 40 ºC Ambient 34 | ni.com | NI SMD-7611/7612 User Manual...
- Page 35 Figure 55. Duty Cycle for the ST34-2 with the SMD-7612 at 48 VDC ST34-2 Max Duty Cycle vs Speed Figure 56. Duty Cycle for the ST34-2 with the SMD-7612 at 60 VDC ST34-2 Max Duty Cycle vs Speed NI SMD-7611/7612 User Manual | © National Instruments | 35...
- Page 36 Figure 58. Duty Cycle for the ST34-5 at 48 VDC (Parallel Connection) ST34-5 Max Duty Cycle vs Speed Figure 59. Duty Cycle for the ST34-5 at 60 VDC (Parallel Connection) ST34-5 Max Duty Cycle vs Speed 36 | ni.com | NI SMD-7611/7612 User Manual...
- Page 37 Figure 61. Duty Cycle for the ST34-5 at 48 VDC (Series Connection) ST34-5 Max Duty Cycle vs Speed Figure 62. Duty Cycle for the ST34-8 at 24 VDC ST34-8 Max Duty Cycle vs Speed NI SMD-7611/7612 User Manual | © National Instruments | 37...
- Page 38 Figure 64. Duty Cycle for the ST34-8 at 60 VDC ST34-8 Max Duty Cycle vs Speed Figure 65. Duty Cycle for the ST34-4 at 60 VDC ST34-4 Max Duty Cycle vs Speed 38 | ni.com | NI SMD-7611/7612 User Manual...
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Page 39: Drive Heating
Drive Heating While NI SMD-7611/7612 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 may also require that the drive be mounted to a heat conducting metal surface. -
Page 40: Mechanical Outline
0.89” (22.5 mm) .125” (3.2 mm) 4.65” (118 mm) Figure 68. Mechanical Dimensions (Top View) 4.42 (112 mm) 4X DIA .137” (3.5 mm) 0.887” (22.5 mm) 0.996” (25.3 mm) 0.35” (8.9 mm) 40 | ni.com | NI SMD-7611/7612 User Manual... -
Page 41: Technical Specifications
Fault output............Photodarlington, 80 mA, 30 VDC max. Voltage drop..........1.2 V max at 80 mA Dimensions ............1.3 × 3.0 × 4.65 inches (33 × 75.5 × 118 mm) NI SMD-7611/7612 User Manual | © National Instruments | 41... -
Page 42: Alarm Codes
Open motor winding 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...
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