The Pacific Scientific 6415 Microstep Drives are economical two-phase stepper drive modules that combine a microstepping power stage with an integral ramped oscillator card that generates step pulses and direction signals from a voltage-controlled speed command.
The drive converts those step/direction commands into regulated motor winding currents for controlling a two-phase stepper motor, using a bipolar chopper PWM current-regulation scheme operating at approximately 20 kHz. Motion profiling is built in, with adjustable acceleration and deceleration controls and two selectable run-speed levels that can be switched to improve stop-position repeatability or function as a secondary speed. The series supports switch-selectable microstepping across a wide range of step resolutions and includes a digital electronic damping function intended to reduce mid-range instability, torque loss, or stalling that can occur in open-loop stepper systems. Electrically, the 6415 operates from a 24–75 VDC bus, provides optically isolated control inputs, and offers DIP-switch selectable output current settings from 0.625 A RMS up to 5.0 A RMS to match compatible motor windings.
