Description
- Model: Pacific Scientific 6445-001-K-N
- Brand: Pacific Scientific (now part of Kollmorgen)
- Series: 6400 Series Servo Drive
- Core Function: Brushless DC servo drive for velocity and torque control
- Product Type: Servo Controller / Drive Module
- Key Specs: Input: 120/240 V AC, Current rating: 5/10 A (peak/continuous), Feedback: Resolver
- Input Power: 120 V AC or 240 V AC, 50/60 Hz
- Output Current: 5 A continuous / 10 A peak
- Feedback Compatibility: Resolver-based feedback
- Control Loop: PI (Proportional-Integral) velocity loop
- Communication Interface: Analog command signal (±10 V)
- Protection Features: Over-voltage, under-voltage, and short-circuit protection
- Operating Temperature: 0°C to 50°C
- Mounting: Vertical panel mount (chassis)
Application Scenarios & Engineering Pain Points
The 6445-001-K-N is a legacy drive often found in CNC machinery, packaging lines, and robotics manufactured in the late 90s to early 2000s. When these units fail, the machine is often held hostage by obsolete electronics. Retrofitting a new drive can cost thousands in engineering time and re-programming, making a drop-in replacement of the original drive the most cost-effective path to restoring uptime.
Typical Application Scenarios:
- Metal Fabrication – CNC Turret Punches Used for high-speed axis positioning where resolver feedback is required for absolute position integrity.
- Packaging Industry – Form-Fill-Seal Machines Provides the precise torque and velocity control needed for high-cycle sealing jaws.
- Material Handling – Automated Conveyor Sorting Controls the acceleration and deceleration ramps required for product indexing.
Case Study: Legacy CNC Machine Recovery A regional metal fabrication shop experienced a failure in their primary axis drive (6445-001-K-N). The original equipment manufacturer (OEM) had declared the drive obsolete. The alternative was a multi-thousand dollar system upgrade requiring new motors and a complete PLC code rewrite. By sourcing our tested surplus unit, the customer swapped the module, adjusted the internal potentiometer settings to match their backup documentation, and had the machine operational in under 4 hours.
Troubleshooting Quick Reference
If you are facing a machine stoppage, follow this prioritized checklist to determine if the drive itself is the culprit.
| Failure Symptom | Possible Cause | Quick Check Method | Recommended Action |
|---|---|---|---|
| No Status LEDs | Loss of Control Power | Check 24 V DC supply at logic terminals | Inspect input power/transformer |
| Drive Fault (Red LED) | Over-current or Short | Disconnect motor, power up. If clear, check motor cable | Check motor winding insulation |
| Motor Runaway | Feedback/Resolver Issue | Monitor velocity signal (pins 10/11) | Verify resolver excitation signal |
| Jitter/Instability | Gain/Potentiometer Drift | Check current loop/velocity loop pots | Recalibrate according to manual |
Engineer’s Note: ❗ Critical Warning: The 6445-001-K-N uses electrolytic capacitors that age over time. If your unit has been sitting in storage for more than 5 years, do not apply full line voltage immediately. “Forming” the capacitors by slowly ramping up the voltage via a Variac is highly recommended to prevent internal shorts.
