Practical Tips - Uno International Stepper Control Board Manual

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7. Practical tips

Run any new tubing in. New tubing is very stiff and requires a lot of torque from the motor. Once the tubing has
been "softened" you will be able to run at much higher speeds without problems. We suggest 100 revolutions to
run a tube in.
Adjust the run current to the speed of rotor. If you want to run the pump very slowly, for example at the min
speed of 50 steps/sec, reduce the Run Current to 500mA. Too much current causes the motor to shudder and
the processor to overheat. In most applications you will not need a higher supply current than 1500mA. You can
set a different Run Current for each protocol you run.
When a stepper motor slips, a high pitch noise can be heard and the motor stalls. Any of the variants can cause
a motor to slip. The optimal settings of the acceleration, the initial speed and the final speed are all crucial for
the best motor run.
Setting a high speed with too high initial speed will cause the motor to slip.
In very short rotations, for example 100 steps, the motor might not reach the requested speed.
Uno International Ltd.
Stepper Control Board Manual 14/21