Kollmorgen S7240S-NAF2NA

Kollmorgen S7240S-NAF2NA

Product Introduction
The S7240S-NAF2NA is a high-performance digital servo amplifier in the Kollmorgen SERVOSTAR S700 family, belonging to the S7240S size class. The “NAF2NA” designation indicates the standard European/international configuration with CANopen and EtherCAT onboard, dual-channel STO, 208–480 V mains voltage, and the F2 controlled fan option factory-installed in Slot 2. This model provides the full S7240S feature set with the added benefit of noise-reduced cooling.

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Description

Kollmorgen S7240S-NAF2NA

Technical Specifications

  • Product Family: SERVOSTAR S700 Series
  • Size Class: S7240S
  • Device Designation: S7240S-NAF2NA
  • Product Category: Digital servo amplifier
  • Rated Line Voltage: 3×208 V (−10%) to 3×480 V (+10%)
  • Rated DC Bus Voltage: 290–675 VDC
  • Safety: Dual-channel STO (Safe Torque Off)
  • Onboard Communication: CANopen and EtherCAT
  • Expansion Card: F2 controlled fan option installed in Slot 2
  • Certifications: CE, UL, TÜV

Functional Features

  • Controlled Fan (F2 Option in Slot 2): Fan switches on/off or runs at 50% speed based on heat sink temperature and brake power, reducing average noise emission
  • Fan Switching Thresholds: Fan off below 55°C heat sink / 60°C internal / 20 W brake power; fan at 50% around 58°C / 65°C / 30 W; fan fully on above 65°C / 75°C / 45 W
  • Multi-Loop Control: High-speed current, velocity, and position control loops
  • Autotuning: Automatic PID parameter and feedforward adjustment
  • Cogging Suppression: Minimized motor cogging for smooth operation
  • Macro Programming: IEC 61131-3 structured text with 128 KB code memory
  • Multi-Feedback Support: Up to three simultaneous feedback systems
  • Dual-Channel STO: SIL2/PLd compliant safe torque off
  • Dynamic Braking: Integrated braking circuit with standard internal braking resistor
  • MMC Storage Card Slot: Parameter and firmware backup

Application Scenarios

  • Noise-Sensitive Environments: Laboratories, cleanrooms, medical facilities, and office-adjacent production areas
  • Multi-Function Systems: Applications requiring controlled fan noise reduction with Slot 3 remaining free for additional expansion cards
  • Heavy-Duty Automation: Large-scale conveyor systems, heavy material handling, and high-throughput assembly lines
  • Machine Tools: High-power feed axes, spindle drives, and multi-axis CNC systems
  • Industrial Robotics: Heavy-duty robotic arms, gantry systems, and palletizing robots
  • Metal Forming: Press feeds, shearing machines, and bending equipment
  • Woodworking and Plastics: Router drives, extruder feeds, and injection molding actuators

Performance Parameters

  • Drive Type: Digital servo amplifier with IGBT power stage
  • Control Modes: Torque, speed, and position control
  • Switching Frequency: High-frequency PWM for low acoustic noise
  • Protection Features: Overcurrent, overvoltage, undervoltage, overtemperature, phase loss, short circuit, and soft start
  • Motor Overload Protection: Solid-state protection at 130% of full load current
  • Short Circuit Rating: Suitable for circuits delivering not more than 42 kA rms symmetrical amperes at max 480 VAC

Material Composition

  • Durable metal enclosure housing integrated power electronics (IGBT module with floating current measurement), control circuitry, EMC filter, heat dissipation components, and F2 controlled fan option card in Slot 2

Structural Features

  • Form Factor: Compact single-channel servo amplifier
  • Mounting: Panel mounting inside control cabinets
  • Expansion Slots: Slot 1 (empty), Slot 2 (F2 controlled fan card installed), Slot 3 (available for user expansion)
  • Connectors: Power input/output terminals, motor connection terminals, feedback connector, STO inputs, and fieldbus interface
  • Shield Connections: All shield connections made directly to the amplifier

Working Principle
The S7240S-NAF2NA receives three-phase AC power, rectifies it to a DC bus voltage, and drives the connected servo motor through its IGBT power stage. The drive uses closed-loop feedback control for precise torque, speed, and position regulation. The F2 option card in Slot 2 monitors internal temperature, heat sink temperature, and brake resistor power dissipation to dynamically control the cooling fan speed, optimizing the balance between thermal management and acoustic noise.

Installation Requirements

  • Mount inside a closed switchgear cabinet free from conductive or corrosive materials
  • Use non-painted (conductive) mounting plates for proper EMC grounding
  • Ensure adequate clearance above and below the amplifier for unimpeded ventilation
  • Keep the ambient temperature within the permitted range (0°C to 40°C, up to 45°C with derating)
  • Connect power supply with appropriate fusing
  • Use 60°C or 75°C copper wire only; use Class 1 wire only
  • Use shielded cables for motor and feedback connections
  • Do not mount devices producing strong magnetic fields directly beside the amplifier

Usage Notes

  • The F2 option card is factory-installed in Slot 2 and cannot be added later; verify this configuration at ordering
  • Slot 3 is available for additional expansion cards such as PosI/O or PosI/O-Monitor
  • Monitor the fan operation through the LED display and drive parameters
  • Run the autotuning procedure after mechanical installation
  • If STO is not required, connect STO1-ENABLE and STO2-ENABLE directly to +24 VDC
  • Do not disconnect motor or power cables while the drive is energized
  • Use the MMC storage card to back up parameters before firmware updates
  • Wait 10 minutes after removing power before touching potentially live sections due to residual voltage

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