SDC107 –DC motor driver user manual
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7
OFF
ON
Speed control
Current limitation
ON
ON
Current limitation
Speed control
In cases of using the built-in 10-turn potentiometer to set the desired current:
turn the potentiometer maximally to the left (make 10 turns or until you feel resistance)
turn the potentiometer clockwise X times 0.5 A (e.g. for 2 A current turn 4 turns).
A) Example: Speed regulation by an external potentiometer and current limitation using built-in
Picture. 3 Speed regulation by external potentiometer with current limitation.
B) Example: Speed control with built-in potentiometer without current limitation max. (~ 6 A)
Picture. 4 Speed control with built-in potentiometer.
3.2
SOFT-START function (SOFT-START - S3)
The S3 switch enables activation of the SOFT-START function, which causes a soft start of the motor (the delay in
reaching the maximum speed is about 2 seconds).
Activation of the function may be necessary when controlling motors with more power or driving mechanisms with
greater inertia. Otherwise, the driver may indicate overload during the start or reversing at a higher speed.
3.3
Dynamic brake function (BRAKE-STOP – S4)
Switching S4 to ON enables the dynamic braking function. Then, removing the ENABLE signal or giving a signal to
the limit input (LIMIT N or P) causes the motor to stop abruptly. During such braking, the energy from the motor is
returned by the driver to the power source.
CAUTION!
During dynamic braking, the energy of the accelerated motor is returned by the driver in the form
of voltage to the power source (the motor then works as a generator). Therefore, it is necessary to
provide power supply to the driver to collect reverse energy - e.g. equip the power supply with large
electrolytic capacitors. Therefore, the use of switched-mode power supplies is also not
recommended.
