RMS Technologies R208 DRIVER - Manual (Page 16)

RMS Technologies Page 16 Version 1.22
R208 Microstepping Driver Manual 8/31/2007
9. TROUBLESHOOTING & FAQ
When you first encounter a problem, the first step is to identify which component is
the cause of the problem. You can do this by swapping out individual components
and verifying if they work independently.
Make sure that you have connected all the wiring correctly, this is a common cause
of most problems
Problems and Solutions
• 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 does not help, is the external
+5 VDC Power connected? Is Pin 4 (enable/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 that you disable the motor from running (either turn off the
power, or use the disable pin), then change the step resolution
Will potential back-EMF from the step motor damage the R208?
The circuit on the board is protected and it should not be an issue if you are using
the driver properly.
How long are the DB-9 mating cable and crimp style motor cable? Are the
leads open on the other end?
Both cables are about 12 inches in length. The leads are open at the ends.
How many turns is the output current potentiometer?
The output current potentiometer is multi-turn. We recommend using a voltimeter if
you need to adjust the output current.
Is the R208 a logic sourcing or sinking?
The R208 is a Logic sinking driver. The R208 driver requires an external power
source - power is put into the driver, whereas a logic sourcing driver can provide a
power source.
What is the heat dissipation of the R208?
It has 35°C/Watt heat dissipation, which is very low compared to other drivers.