6445-001-k-n Pacific Scientific
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The 6445-001-k-n is a stepper drive from Pacific Scientific's 6410 Stepper Drives series. It operates with an AC input of 120 or 240 VAC and supports a chopper frequency of 20 kHz, with an internal bus voltage of 66 VDC. The drive features a peak current of 7.1 Amps and a rated current of 5.0 Amps RMS, along with 16 user inputs and 12 user outputs.
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Product Description:
The 6445-001-k-n is a microstepping drive manufactured by Pacific Scientific for the 6410 Stepper Drives series. Designed for motion axes that require fine incremental positioning, the unit converts logic-level step pulses into controlled phase currents that energize two-phase stepper motors in packaging, material-handling, or small CNC equipment. An internal single-phase rectifier allows direct connection to either 120 VAC or 240 VAC mains, so no external transformer is required to produce the regulated DC bus. This arrangement simplifies power distribution while supporting precise control of motor speed and position.
The rated input can be either 120 VAC or 240 VAC, and the drive generates an internal bus voltage of 66 VDC to energize the motor windings. The current waveform is pulse-width modulated at 20 kHz, keeping audible noise low while maintaining torque linearity. The peak phase current reaches 7.1 A, while continuous operation is limited to 5.0 A RMS to protect the motor insulation. Microstepping resolution is selectable down to 1/250 of a full step, reducing mid-band resonance in precision stages. The maximum input current is 5.0 A RMS, and the supported line frequency is 60 Hz with a 120 VAC supply or 50 Hz with a 240 VAC supply. The drive uses a chopper control scheme to regulate winding current as motor speed and load conditions change.
Control communication is handled through a 9600-baud serial port, and the pulse input channel accepts rates up to 500,000 pulses per second for high-speed index moves. Application programs of up to 12 KB are stored in nonvolatile memory, allowing stand-alone execution with 16 user inputs and 12 user outputs for connected sensors and actuators. The protective branch fuse is rated at 5 A Slo-Blo, 250 VAC, providing overcurrent protection for the incoming power circuit. Overall dimensions of 6.30 × 4.24 × 12.50 inches allow the drive to fit standard control panels without requiring a deep enclosure. The chassis dissipates heat generated during continuous operation, and adequate panel airflow helps keep the power electronics within their operating temperature range.
