Configuring the Motor (STM)

To obtain the best performance from your STM without generating too much heat, you need to set three different currents.

Idle current reduction automatically reduces motor heating by lowering the current when the motor is at rest. In most cases, the default value of 50% works well. Again, you can reduce motor heating further by lowering the idle current percentage.

It is also possible to adjust the idle current delay, which is the delay between the instant the motor stops moving and the actual reduction of the current. It's good to allow a little time for the motor to settle out after a move before going into idle reduction. The default setting of 0.40 seconds is generally sufficient for this purpose.

Acceleration current is the current that is used when the motor is speeding up and slowing down. This is when the motor needs to produce the most torque, so set the Accel Current higher than the Running Current.

Running current is used when the motor is moving at a constant speed. In most applications, the torque requirement at speed is lower than it is during acceleration, so you can conserve power and keep the STM's temperature lower by setting the Running Current to a lower value than the Accel Current.

Load Inertia

The anti-resonance feature is most effective if you can precisely set the load inertia. If you know this value, click on the first option button, enter the inertia in the box and select the units (oz-in-sec2, g-cm2, etc) from the list. If you don't know the exact inertia of your load, but you want to try something and see how it works, choose the second option button and enter a load to motor inertia ratio in the box.