Product Description:

The 6410-020-N-N-N is a stepper motor drive produced by Pacific Scientific within the 6410 Stepper Drives series. As a two-quadrant current chopper, it converts a regulated DC bus into phase currents that advance hybrid stepper motors in open-loop indexing systems. In industrial automation, the unit delivers precise incremental motion for packaging tables, laboratory dispensers, and other light-duty axes where encoder feedback is unnecessary. Because it operates without closed-loop feedback, motion quality depends on the commanded pulse train and the motor-to-load match rather than encoder correction.

The drive includes over-voltage protection at the input to protect internal devices from excessive bus stress. Internally, a chopper oscillator runs at 20 kHz, and this frequency lowers current ripple in the motor windings. The drive accepts step commands up to 2.0 MHz, yet limits internal updates to 500 kHz to suppress line noise. Each phase can be driven continuously to 5 A rms, with short bursts reaching the 7.1 A peak rating for acceleration. Reliable edge detection requires a minimum pulse width of 250 ns and a direction signal held for 50 µs before the next step, allowing accurate microstepping at full speed. This operating method helps the motor run more smoothly at low and moderate speeds while keeping winding current under control.

The housing measures 5 × 1.5 × 4.3 in, and its aluminum base keeps the weight to 1 lb for installation on narrow DIN rails or directly on machine panels. Pacific Scientific supplies this version without a connector kit and without a cover, so field wiring is done through 26-pin headers that mount directly to the board, and external strain relief is required. The open-board connection style is better suited to protected electrical enclosures than exposed mounting locations. Because there is no heat sink option, chassis temperature must stay below 60 °C, and the enabled output transistor drop is limited to 35 V maximum. When the motor is idle, the drive automatically reduces current to 50 %, lowering dissipation while maintaining holding torque. The bus disables if the DC level exceeds 83 Vdc, so the power supply must be clamped during deceleration.