Description
Pacific Scientific 6445-001-K-N | Motion Controller Unit In Stock
Architect’s Product Breakdown
The Pacific Scientific 6445-001-K-N functions as a complete, standalone motion sub-system that merges a 300 W off-line switching power supply, an advanced microprocessor-based indexer, and a high-performance microstepping drive into a single hardware footprint. By utilizing onboard StepperBASIC firmware backed by 12 kB of battery-backed RAM, the unit executes complex motion profiles, conditional branching, and feed-to-length tasks without requiring continuous intervention from a host PLC. Its patented 4-phase bipolar chopping topology runs at 20 kHz to maximize back-EMF rejection while cutting low-speed ripple current and mid-range motor resonance.
Panel layout requires careful consideration of the unit’s substantial physical dimensions (6.3 by 4.25 by 12.5 inches) and direct AC mains wiring. Thermal dissipation relies on an internal cooling fan, demanding that cabinet ambient levels stay strictly between 0 °C and 50 °C to prevent premature thermal fault shutdowns. When retrofitting this module into older legacy architectures, technicians must meticulously map the 16 configurable digital inputs, 12 open-collector outputs, and quadrature encoder feedback lines to ensure reliable position verification and fault handling.
6445-001-K-N
Key Technical Specifications
| Parameter | Specification |
| AC Input Voltage | 120 / 240 VAC (+10%, -15%), 50/60 Hz (Switch Selectable) |
| Internal Power Rating | 300 W continuous internal switching supply |
| Continuous Phase Current | Adjustable from 0.625 A to 5.0 A RMS (in 0.625 A increments) |
| Peak Phase Current | 7.1 A Peak (Sine wave microstepping) |
| Auxiliary Axis Output (J6) | 66 VDC nominal (supplies power to an additional slave drive axis) |
| User Memory | 12 kB battery-backed RAM for parameters and move profiles |
| Programming Language | StepperBASIC (RS-232 / RS-485 at 9600 baud) |
| Discrete I/O | 16 programmable inputs (5 VDC pull-up) / 12 programmable outputs (100 mA sink max) |
| Microstepping Resolution | Up to 51,200 steps/rev (decimal increments for 1.8° motors) |
| Enclosure Dimensions | 6.30 in x 4.25 in x 12.50 in |
| Operating Temperature | 0 °C to 50 °C ambient (with internal fan active) |
| Weight | 10 lbs nominal |
Field Engineer’s Pitfall Guide
- WARNING: Unprotected Auxiliary 66VDC Bus. The J6 terminal outputs an unisolated 66 VDC rail intended solely to power a secondary slave drive module. Accidentally shorting this bus to control commons or ground while the main AC breaker is energized will instantly destroy the internal regulation path.
- CAUTION: RAM Battery Depletion. The 12 kB of RAM relies on an internal battery backup to retain stored StepperBASIC programs and custom parameters during power cycles. Ignoring a low-voltage battery warning means losing entire machine profiling scripts upon a routine plant power outage.
- NOTICE: Encoder Phasing & Line Drivers. The encoder interface strictly requires differential line-driven quadrature signals. Tying single-ended encoder outputs directly into these terminals introduces noise susceptibility, causing false stall detections and immediate positioning faults.
QA & Testing SOP
- Visual & Origin Inspection: Checked against OEM specifications for structural enclosure integrity, fan operation, internal jumper positions, and battery voltage levels.
- Live Test Bench Environment: Energized via an isolated 120/240 VAC variable supply to test internal switching power rails and processor boot logic.
- Communication & Memory Verification: Serial interfaces (RS-232/485) are tested at 9600 baud to validate command execution, program downloading, and RAM data retention.
- I/O and Encoder Handshake: All 16 inputs and 12 outputs are driven through simulation blocks, while quadrature encoder inputs are verified for correct position tracking and electronic gearing response.
- Packaging: Sealed within static-shielding material and packed inside heavy-duty foam inserts to absorb transit shocks.
Technical FAQ
Can I hot-swap this module while the process is running?
No. Plugging or unplugging the high-voltage AC input lines, pluggable Phoenix motor terminals, or the J6 auxiliary bus under power causes severe electrical arcing and will destroy internal switching components.
How do I back up my custom motion programs?
Programs and parameter variables are saved in the unit’s 12 kB battery-backed RAM. You must use a PC running PacCom or compatible terminal software over the RS-232/485 serial port to upload and save program text files externally.
Why is the drive throwing an over-temperature or foldback fault?
The 6445 relies on an internal cooling fan to clear heat from the 300 W power supply and drive stage. If the internal fan fails or panel louvers are blocked, internal ambient temperatures quickly exceed the 50 °C maximum limit, tripping thermal protection.
Can this drive control multiple motors simultaneously?
Yes. It supports a master/slave two-axis configuration. The primary drive handles the indexer logic and motion program while delivering auxiliary 66 VDC power and clock/direction signals to a compatible secondary slave drive.
