National Instruments nuDrive 4SX-411 Operation & User’s Manual

27 nuDrive Accessory User Guide Two-phase stepper motors come in 4-, 6-, and 8-wire variations. Figure 22 shows a 6-wire and an 8-wire stepper motor respectively. A 4-wire motor is the same as a 6-wire motor except that the center taps (CT) are not brought out. Figure 22. 6-Wire and 8-Wire Stepper Motors For maximum flexibility, you can connect 8-wire stepper motors in either a series or parallel configuration. Connecting the windings in series as shown in Figure 23 produces the most torque per amp, but has the disadvantage of higher inductance and poorer h ...

19 nuDrive Accessory User Guide The amplifier peak and continuous current limits and the current gain have been factory set for 5 A continuous and 10 A peak current output. Verify that these settings are appropriate for your application before powering your motors. Adjusting Current Gain and Current Limits You can adjust the current gain and current limits by changing the values of R6, R7, R40, and R42 on the servo amplifiers. The resistors are standard 1/4 W axial leaded type and are plugged into sockets on the PWM per axis servo drives. Note Some component ...

7 nuDrive Accessory User Guide Either switch can turn off the motors. However, as long as the nuDrive POWER switch is still on, independent power and enable circuits cause the incremental encoders to continue to track motor position while the amplifiers (drivers) are disabled by the ENABLE switch being off. Note The ENABLE switch illuminates whenever it is switched on. It does not indicate that the amplifiers/drivers are disabled under the following conditions: E-Stop active (see E-Stop Terminal Block), host bus interlock fault, or amplifier/driver protectio ...

29 nuDrive Accessory User Guide Figure 26 shows the wiring for a typical 4-wire motor. Figure 26. 4-Wire Motor Wiring Specifications The following specifications apply only to the nuDrive. To obtain a system specification, you must account for your motion controller. Please refer to your controller specifications to determine overall system specifications. Some signals have compatibility defined as signal pass-through. This means the nuDrive may have passive filtering on these signals but will not affect the voltage range or current handling capability. Con ...

23 nuDrive Accessory User Guide located slightly separate from the other two. This is the inhibit status LED (labeled INH). If a motor does not move when commanded and this LED is on, check that the nuDrive is enabled via the ENABLE switch, host interlock and external inhibit inputs, and not in an E-Stop condition. Stepper Driver Configurations The stepper nuDrive uses bipolar chopper two-phase microstepping drivers with a broad range of microstep ratios and current output settings. The factory-default settings are 10-times microstepping (2,000 steps/rev wit ...

13 nuDrive Accessory User Guide Caution The FlexMotion-6C board will be damaged if the isolated voltage selection jumpers on the board are set to use the internal voltage source and an external source is connected directly to these signals on the nuDrive. Be careful to review the configuration of the isolated voltage jumper section prior to powering any FlexMotion-6C circuits or the host PC containing the FlexMotion-6C board. I/O Terminal Blocks The I/O connectors are configured differently on different nuDrives, as described in the following sections. CX an ...

5 nuDrive Accessory User Guide What You Need to Get Started To set up and use your nuDrive accessory, you will need the following items: K The nuDrive accessory and nuDrive Accessory User Guide K Power cord (IEC type) K One or more of the following National Instruments cables and adapters: – SH68-68-S shielded cable, part number 185262-02 – NB1 ribbon cable, part number 180524-20 – SH50-50 shielded cable, part number 185319-02 – SH100-100-F shielded cable, part number 185095-02 – SH68-C68-S shielded cable, part number 186381-02 – 68M-50F step/ser ...