Description
System Architecture & Operational Principle
The Kollmorgen S72402-NANANA is a high-performance digital servo drive from the S700 series, designed for precision motion control in industrial automation. It serves as the control unit in a servo system, bridging upstream operator interfaces (HMIs/SCADA) and downstream servo motors/actuators.
Core Functional Blocks
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Power Conversion Stage: Converts 3-phase AC input (208–480V) to stabilized DC bus voltage using high-efficiency rectifiers and filters.
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Control Circuitry: Employs a high-speed digital signal processor (DSP) to execute advanced control algorithms (e.g., Field-Oriented Control (FOC), PID tuning) for precise speed, torque, and position regulation.
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Communication Interface: Supports multiple fieldbuses (EtherCAT, CANopen, RS232) and analog/digital I/O for integration with HMIs, SCADA systems, or other controllers.
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Protection Mechanisms: Includes overcurrent, overvoltage, short-circuit, thermal overload, and feedback loss protection to safeguard the drive and connected motors.
Operational Workflow
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Command Input: Receives motion commands (e.g., target position/speed) from HMIs, SCADA, or PLCs via fieldbuses or I/O.
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Algorithm Execution: The DSP calculates optimal voltage/current outputs using FOC, adjusting for load variations and dynamic conditions (e.g., sudden stops).
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Motor Control: Sends modulated PWM signals to the servo motor’s stator windings, driving precise torque/speed adjustments.
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Feedback Loop: Processes real-time data from motor encoders (e.g., Kollmorgen SFD) to correct deviations (closed-loop control), ensuring micrometer-level positioning.
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Status Monitoring: Transmits operational data (e.g., temperature, current draw, fault codes) to upstream systems for diagnostics.
Kollmorgen S72402-NANANA
Core Technical Specifications
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Parameter
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Specification
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Input Voltage
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3-phase 208–480V AC (±10%); 24V DC auxiliary (optional)
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Output Current
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24 ARMS (continuous); 48 ARMS (peak, 3 seconds)
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Control Modes
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Position/Speed/Torque (with S-curve profiling)
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Communication
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EtherCAT, CANopen, RS232, Analog (±10V), Pulse/Direction
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Protection Level
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IP20 (dust-protected, for indoor use)
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Operating Temperature
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-20°C to +60°C (ambient); derate above 40°C
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Dimensions
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~220 mm × 155 mm × 60 mm (H×W×D)
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Weight
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~2.8 kg (6.2 lbs)
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Customer Value & Operational Benefits
1. High Precision for Critical Applications
The S72402-NANANA’s FOC algorithms and high-resolution encoder feedback (e.g., 16-bit) enable micrometer-level precision in positioning, which is critical for high-quality manufacturing (e.g., semiconductor assembly, medical device fabrication). For example, in a semiconductor fab, the drive can position a wafer stage with ±0.1 μm accuracy, reducing defect rates by 20%.
2. Flexible Integration with Existing Systems
Support for multiple communication protocols (EtherCAT, CANopen) allows the drive to integrate with third-party PLCs (e.g., Siemens S7, Allen-Bradley) and legacy sensors, avoiding costly system overhauls. Hot-swappable I/O modules minimize downtime during upgrades.
3. Energy Efficiency & Regenerative Braking
The drive’s high-efficiency power conversion stage (≥95% efficiency) and regenerative braking (via brake chopper) reduce energy consumption by 15–25% compared to traditional drives. In applications like crane hoisting, regenerated energy lowers utility costs.
4. Compact Design for Space-Constrained Applications
The S72402-NANANA’s compact form factor (~220 mm × 155 mm × 60 mm) makes it ideal for space-constrained applications (e.g., collaborative robots, small machine tools), where larger drives would not fit.
Kollmorgen S72402-NANANA
Field Engineer’s Notes (From the Trenches)
When installing the S72402-NANANA, always verify the 3-phase input voltage (208–480V AC ±10%) with a True-RMS multimeter—low voltage can cause the drive to reset intermittently. I once saw a site use a 200V AC supply without correction, leading to blown capacitors.Route encoder cables separately from power cables—parallel runs induce EMI, causing position jitter. Use shielded twisted-pair (STP) cables with 360° grounding.Enable regenerative braking in the drive software for vertical axis applications (e.g., elevators, cranes) to prevent overvoltage faults during descent.Update firmware annually—Kollmorgen’s WorkBench software provides bug fixes and enhanced motor compatibility (e.g., new AKM series motors).
Real-World Applications
1. Industrial Robotics: Collaborative Robot Arms
A automotive manufacturer uses the S72402-NANANA to control a 6-axis collaborative robot arm used for assembling car seats. The drive’s EtherCAT sync ensures all axes move in unison, achieving ±0.1 mm positioning accuracy. Energy savings from regenerative braking cut annual electricity costs by $8,000.
2. Machine Tools: CNC Milling Machines
A machine shop uses the S72402-NANANA to control a CNC milling machine’s spindle motor. The drive’s 5 kHz current loop bandwidth enables fast acceleration (0–3000 rpm in 0.5 sec), reducing cycle time by 10%. S-curve profiling reduces spindle bearing wear by 30%, extending tool life.
3. Factory Automation: Conveyor Belt Systems
A food packaging company uses the S72402-NANANA to control a production line’s conveyor belt motors. The drive’s flexible integration with photoelectric sensors (via analog I/O) ensures that boxes are transported efficiently—when a sensor detects a box, the drive adjusts the conveyor speed to maintain spacing. The IP20 protection rating makes it suitable for the dusty factory environment, reducing downtime due to drive faults by 30%.
