Description
Product Introduction
The Pacific Scientific 6440-001-K-N is a high-performance AC-input microstepping drive designed to power 2-phase hybrid stepper motors in demanding motion control systems. By accepting line-voltage AC power directly, it eliminates the need for bulky external DC bus power supplies, making it a space-saving solution for multi-axis enclosures and industrial machinery.
Unlike lower-voltage DC-fed drives that lose torque rapidly at elevated speeds, the 6440-001-K-N utilizes a high-voltage internal DC bus generated directly from the AC line. This elevated bus voltage drives current through the motor windings faster, significantly expanding the motor’s usable speed-torque curve while maintaining high positional resolution through microstepping.
Key Technical Specifications
| Parameter | Specification |
| Input Supply Voltage | 120/240 VAC (Nominal, 50/60 Hz) |
| Peak Output Current | Up to 7.1 A Peak (Selectable) |
| Continuous Output Current | 5.0 A RMS |
| Drive Architecture | Bipolar PWM chopper with high-voltage internal DC bus |
| Control Logic Inputs | Optically isolated Step, Direction, and Enable signals |
| Step Resolution | DIP switch configurable (Full step to microstepping) |
| Cooling Method | Chassis thermal dissipation / Natural convection |
| Protection Features | Over-temperature, output short-circuit, over/under-voltage |
| Operating Temperature | 0°C to 50°C ambient |
Application Scenarios & The “Trench” Experience
A major automotive stamping facility ran into a critical shutdown when an indexing feeder drive failed on an older transfer press line. The original panel was built around 240 VAC direct-line stepper drives, and modern DC drives wouldn’t fit without adding a huge 1000VA power supply inside an already crowded enclosure. Dropping in a replacement 6440-001-K-N restored the line in under an hour, avoiding tens of thousands of dollars in line-down penalties.
- Automated Material Handling – High-speed rotary indexing tables where maintaining torque at high speed is critical to cycle times.
- Textile & Printing Presses – Continuous web tensioning and registration adjustment requiring smooth microstepping resolution.
- Custom CNC & Woodworking Machinery – High-voltage feed drives providing high torque without stalling during rapid moves.
- Industrial Packaging Equipment – Case cartoners and product pushers needing high-duty-cycle reliability in continuous operation.
6440-001-K-N
6440-001-K-N
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual Pacific Scientific test stations. Every unit passes a rigorous five-step verification before shipping:
- Inbound Inspection: Full physical check for PCB damage, worn terminal blocks, heat sink corrosion, and OEM rating labels.
- High-Voltage Live Testing: Powered on at 120/240 VAC on a live test rack to verify internal bus rectifiers and logic power supplies.
- Motion Profile Validation: Coupled to a Pacific Scientific stepper motor and run through full-acceleration, decelerating, and high-speed directional profiles.
- Thermal & Electrical Stress: Monitored under load to check thermal performance and verify short-circuit protection circuits.
- ESD Packaging & QC: Rotary/DIP switches set back to factory defaults, cleaned, sealed in ESD shielding, and packed in heavy-duty foam casing.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ 120 VAC vs. 240 VAC Input Jumpers: Verify the main AC power selection jumpers/terminals before applying power! Feeding 240 VAC to a drive configured for 120 VAC will instantly pop the internal rectifier stage and blow main fuses.
- ❗ Never Disconnect Motor Cables Live: Disconnecting motor leads (A, A\setminus, B, B\setminus) while the AC mains are live causes high-voltage inductive kickback that will destroy the power MOSFET output stage instantly.
- ⚠️ DIP Switch Settings Match: Always document and mirror the DIP switch configuration (current limit, step resolution, idle current reduction) from the old unit. Setting motor current too high will overheat the motor within minutes.
- ❗ Heat Dissipation & Clearance: Because the 6440 generates internal heat from its built-in power supply, ensure at least 2 inches of vertical clearance above and below the chassis for natural convection cooling.
Frequently Asked Questions (FAQ)
Q: Does the 6440-001-K-N require a separate DC power supply?
A: No. The 6440 series connects directly to 120 or 240 VAC line power and generates its own internal high-voltage DC bus.
Q: Is this drive hot-swappable?
A: No. You must completely disconnect the AC line power and wait for the internal bus capacitors to discharge before removing or wiring the drive module.
Q: What is the benefit of the high-voltage AC input over a low-voltage DC drive?
A: Higher bus voltages overcome motor winding inductance faster. This allows the stepper motor to maintain higher torque at elevated RPMs compared to 24V or 48V DC drives.
Q: How does automatic idle current reduction work on this drive?
A: When enabled via the internal DIP switches, the drive automatically drops output current to 50% when no step pulses are received for a preset duration, significantly reducing motor heating while stopped.
Q: What condition are these drives supplied in, and what is the warranty?
A: As mature legacy hardware, these units are supplied as New Surplus or fully bench-tested Refurbished stock, backed by a comprehensive 12-month replacement warranty.
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