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Pacific Scientific 6440-001-K-N
Pacific Scientific 6440-001-K-N

Pacific Scientific 6420-001-N-N

Product Name

Integrated Indexer Stepper Drive

Product Description

The Pacific Scientific 6420-001-N-N is an integrated microstepping indexer and drive unit that combines on-board motion programming with power drive electronics for two-phase stepper motors.

Category:
Description
Technical Specifications
  • Input Voltage: 24–75 VDC
  • Output Current: 0.625 A to 5 A RMS, adjustable
  • Step Resolution:
    • Fixed Resolution Mode: 200 to 51,200 steps/rev (binary), 200 to 50,000 steps/rev (decimal)
    • Variable Resolution Mode: 0.01 step resolution at 20–19,000 steps/second
  • Serial Communication: RS-232, RS-422, RS-485 at 9600 bps
  • Discrete I/O: 8 programmable bi-directional lines
  • Program Memory: 1792-byte non-volatile RAM
  • Operating Temperature: 0 °C to +50 °C
  • Maximum Chassis Temperature: 60 °C
  • Humidity: 10% to 90% non-condensing
  • Cooling: Natural convection with optional heat sink
Functional Features
  • Simple mnemonic programming language for standalone motion control
  • Trapezoidal velocity profiles with programmable acceleration/deceleration
  • Digital Electronic Damping eliminates mid-speed motor resonance
  • Idle current reduction reduces motor power dissipation at rest
  • Optically isolated I/O and serial ports for noise immunity
  • Multi-unit networking capability via serial bus
Application Scenarios
  • Standalone indexing and positioning systems
  • Conveyor material transfer and sorting
  • Packaging machine motion sequencing
  • Laboratory automation and test equipment
  • Precision dispensing and assembly systems
Performance Parameters
  • Step rate range: 0.08 to 19,000 steps/second
  • Acceleration factor range: 5 to 255
  • Serial command response time: <10 ms
Material Composition
  • Enclosure: Cold-rolled steel with corrosion-resistant finish
  • Heat sink: Extruded aluminum alloy
  • Circuit board: FR-4 epoxy substrate
  • Connectors: Screw terminals and D-sub connectors
Structural Features
  • Panel mount design with mounting flanges
  • Front panel status LEDs for power and fault indication
  • DIP switches for basic drive configuration
  • Single-unit integration of indexer and power stage
Working Principle

The built-in indexer executes motion programs stored in non-volatile memory or received via serial communication. It generates step pulse trains and direction signals based on programmed target positions, speeds and acceleration profiles. The drive stage converts these logic signals into regulated bipolar winding currents using 20 kHz PWM chopper technology. Digital Electronic Damping circuitry dynamically adjusts current waveforms to suppress motor vibration and resonance. Discrete I/O lines interface with external sensors and actuators for machine sequencing.

Installation Requirements
  • Mount vertically for optimal convection cooling
  • Connect DC power with properly sized over-current protection
  • Terminate RS-485 networks with 120 ohm resistors at both ends
  • Configure I/O direction via jumpers before application
Usage Notes
  • Do not operate above 50 °C ambient temperature
  • Program acceleration values within specified limits to avoid stalling
  • Ensure proper system grounding to prevent communication errors
  • Back up programs stored in NVRAM periodically
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