RMS Technologies Products / Microstepping Drivers / R208 DRIVER
Bipolar Step Motor Driver
Operates from +12 to 24 VDC
Phase current ranges from 0.35 to 2.0 Amps Peak
Selectable Step Resolution from Full, Half, 1/4, and 1/8 microsteps
Optically isolated Step, Direction, and Disable/Enable Inputs
Selectable Current Reduction of 33%
Low Power Dissipation
Efficient Current Control
Thermal Shutdown, Under-voltage Protection
Power-on Indicator
Power Disable/Enable Control
Sinusoidal current waveform
Low Cost Driver


  • INPUT VOLTAGE: +12 to 24 VDC (Includes Unregulated Power Supplies)
  • DRIVE CURRENT(PER PHASE): 0.25 to 1.4 Amps RMS, 2 Amps Peak
  • ISOLATED INPUTS: Step Clock, Direction, Enable & Disable
  • STEP FREQUENCY (MAX): 25 kHz
  • STEPS PER REVOLUTION (1.8 MOTOR): 200, 400, 800, 1600
 
 
Pin Number Color(#26 AWG Lead) Function
1 Red +12 to 24 VDC
2 Black Step Resolution
3 Brown Step Resolution
4 Black/White Disable
5 Orange Direction
6 Green Power Ground
7 White Logic Ground
8 Blue Opto Supply
9 Yellow Step
 
List of Components:
  • R208 Driver
  • DB-9 cable (Included)
  • Power Supply (+12 to 24VDC)
  • Signal Generator (Pulse or Function Generator)
  • +5 VDC Power Supply
  • One 2-Phase Bipolar Step Motor
  • Voltmeter
Setting The Current:
  • Connect the DB-9 cable to the R208 Driver. Take your Voltmeter and place one probe on the White wire, Pin 7. This is logic ground.
  • Place the other probe on the potentiometer within the R208 Driver. Look at drawing to the right.
  • Then apply power to Pins 1 and 6 (Power and Ground respectively). Be sure the Power Supply is between +12 to 24 VDC.
  • Adjust the Potentiometer at the top of the R208 Driver using a small flat screwdriver. Use the following formula to get the correct Voltage reading
Connection Specifications:

1. Begin by connecting your R208 to the provided DB9 Mating Connector Cable.

2. If using a function generator, connect the positive end to Pin 9, Step. Connect the negative end of the generator to the negative of your 5 volt power supply.

3. Take the +5 VDC power supply, and connect the positive end to Pin 8, the Opto.

4. Finally, connect your main power supply. Use Pin 1 for the Positive Terminal and use Pin 6 for the Negative Terminal.

5. Refer to the User Manual for Input features.

 
  • The Motor is in Holding Position, but does not rotate:

    • This means that Power is being supplied to the driver and motor, so the power supply is OK. However, the signal generator might be causing the problem. Try changing the signal to TTL. If this doesn't help, is the external +5 VDC Power connected? Is Pin 4 (disable) touching Pin 7 (logic ground)? This will disable the driver from running.
  • When setting the Current to the R208, the voltmeter never gives a clear reading:

    • If the voltmeter is not giving a clear reading, and you are unable to reach the desired value for V, then the driver has been damaged.
  • The Microstepping doesn't always change to the correct step resolution:

    • Changing the microstepping "on the fly" might ruin the driver. It is recommended to disable the motor from running (either turn power off, or use the disable pin), then change the step resolution.
*PLEASE CHECK BACK FREQUENTLY FOR MORE TROUBLESHOOTING QUESTIONS
 
R208 Driver Comparison
R208-manual
PRODUCT NAME PRICES QTY  
R208 $89.95
 
877-301-3609
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