Product Description:

The 6415-001-N-H-K is a microstep drive manufactured by Pacific Scientific for the 6415 Microstep Drives series. It controls two-phase stepper motors, translating step and direction commands from a PLC into precisely scaled phase currents so automation equipment can index, profile, or hold exact rotor positions. Its two-phase bipolar chopper topology provides smooth low-speed motion without mechanical gearing, making the unit suitable for semiconductor handlers, small conveyors, and laboratory actuators. It accepts optically isolated logic inputs to help guard against ground loops.

Current regulation is handled by a two-phase bipolar chopper circuit that switches at 20 kHz, keeping audible noise low and minimizing ripple torque. The output range extends from 0.625 A RMS per phase up to 5 A RMS, allowing the unit to drive small NEMA-17 motors as well as larger NEMA-34 frames. For rapid acceleration, the current limit can rise to 7.1 A, while a separate 8 V reference supplies 50 mA at 25 °C for potentiometer control. The minimum selectable microstep current of 0.88 A supports fine resolution without overheating small motors. Analog velocity or torque commands enter through a 20 kΩ input, and optically isolated step outputs can source 100 mA for follower axes.

An over-voltage circuit trips at 83 Vdc to protect the power bus, and the thermal sensor stops operation if the aluminum chassis reaches 60 °C. Pulse inputs are accepted at rates up to 500 kHz, while direction changes require a setup time of only 50 µs, making the drive suitable for high-speed positioning tables. To prevent sudden torque spikes, the built-in ramp generator enforces a minimum acceleration period of 50 ms between speed commands. The isolated control lines tolerate up to 5 V of reverse bias, and the drive has a mass of 1.0 lb for panel mounting in multi-axis racks.