6420-001-N-N Pacific Scientific
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The Pacific Scientific 6420-001-N-N, part of the 6410 Stepper Drives series, has a peak current of 7.1 Amps and a motor phase current of 5 Amps RMS for two-phase motors. This drive features 8 discrete I/O lines, operates at a serial rate of 9600 bps, and has dimensions of 5 inches by 1.5 inches by 4.3 inches.
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Product Description:
The 6420-001-N-N stepper drive is manufactured by Pacific Scientific as part of the 6410 Stepper Drives series. It delivers programmed phase currents to a two-phase stepping motor, allowing precise incremental motion in indexing tables, feeders, and small gantries within automated equipment. The unit sits between a motion controller and the motor windings, converting digital step-and-direction signals into controlled current waveforms while helping protect the motor and field wiring. This arrangement supports repeatable starts, stops, and position changes in applications that use discrete motion commands.
Eight optically isolated discrete I/O lines accept control levels up to 30 VDC, with a logic high recognized above 3.7 V and a logic low accepted below 0.8 V. These thresholds help prevent false triggers when open-collector sensors release the line. Each output can sink 70 mA and saturates at 1.0 VDC, providing enough capacity to operate indicator LEDs or miniature relays without external buffers. Configuration and status data move through the asynchronous port at 9600 bps. For power delivery, the drive provides a continuous phase current of 5 A RMS to each of the 2 motor phases and can supply transient current up to 7.1 A during acceleration. A 5.7 VDC auxiliary terminal powers external sensors. The drive also includes 1792 bytes of nonvolatile RAM for storing motion profiles and parameter sets during a loss of input power.
The aluminum enclosure measures 1.5 in in width, 5 in in height, and 4.3 in in depth, permitting dense installation on DIN rails or panel plates. Reliable operation is maintained while the chassis surface remains below 60 °C. A sealed heat spreader couples the power devices to the housing so natural convection can dissipate generated heat. The narrow enclosure conserves lateral cabinet space while providing sufficient surface area for passive cooling. Its physical layout separates the control electronics from the primary heat-producing components, helping the internal circuitry remain within its permitted operating range.
