Kollmorgen SR03550

Kollmorgen SR03550

Product Overview The SR03550 is a digital servo drive from Kollmorgen’s SERVOSTAR S300 series, a compact and cost-effective drive family designed for general automation applications. This drive operates from 230 VAC single or three-phase power input and delivers 3.5 Amps continuous output current. The “SR” prefix indicates a standard drive with resolver feedback capability, while “03550” specifies the 3.5A current rating with 230V input and standard I/O configuration. The S300 series offers a balance of performance and affordability for applications not requiring the highest dynamic response.

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Description

Kollmorgen SR03550

Technical Specifications

Parameter Category Specific Specification
Manufacturer Kollmorgen (Danaher Motion)
Product Family SERVOSTAR S300 Series
Power Supply 1/3-Phase, 230 VAC nominal
Input Current 6.5/3.8 Amps (1-phase/3-phase)
Input Power 1.5 kVA
Output Voltage 3 x 230 VAC (variable frequency)
Output Current 3.5 Amps RMS continuous per phase
Peak Output Current 10.5 Amps RMS (2 seconds)
Output Power 1.1 kVA continuous
PWM Frequency 8 kHz
Control Modes Torque, velocity, position
Command Interface ±10V analog, step/direction
Feedback Resolver, incremental encoder
I/O 3 digital inputs, 2 digital outputs
Protection Overcurrent, overvoltage, undervoltage, overtemperature
Operating Temperature 0°C to +40°C
Storage Temperature -25°C to +55°C
Protection Class IP20

Key Features

  • Compact and Economical: The S300 series provides essential servo functionality in a compact, cost-optimized package
  • Resolver Feedback Standard: Built-in resolver-to-digital converter enables direct connection to resolver-equipped motors without external modules
  • Flexible Power Input: Accepts both single-phase and three-phase 230 VAC input, simplifying installation in facilities without three-phase power
  • Simple Commissioning: Auto-tune function and straightforward parameter structure reduce setup time
  • Reliable Performance: Proven drive platform with robust protection features ensures long service life in industrial environments
  • Basic I/O Integration: Standard digital I/O provides limit switch, home, and brake control functionality

Application Scenarios

  • Small machine tools: Powers benchtop mills, small lathes, and drill presses with servo-controlled axes
  • Conveyor systems: Controls variable-speed conveyor drives with precise speed regulation
  • Winding equipment: Maintains constant tension in wire, cable, and film winding applications
  • Feeding mechanisms: Drives material feed rollers in stamping, cutting, and forming equipment
  • Positioning tables: Controls X-Y positioning stages in inspection and assembly equipment
  • Pump and fan control: Provides variable-speed drive for process pumps and ventilation fans with servo precision
  • Small robotics: Powers educational and light industrial robot arms and gantries

Performance Parameters The S300 series achieves a speed loop bandwidth of 400 Hz, suitable for general positioning and velocity control applications. The current loop bandwidth is 1.5 kHz, providing adequate torque response for most loads. The 8 kHz PWM frequency balances motor performance with audible noise. Position loop update rate is 1 millisecond. The drive supports S-curve acceleration profiles with programmable jerk limitation. Velocity ripple is typically less than 0.5% of commanded speed at rated conditions.

Material Composition The drive enclosure is constructed from aluminum with a painted finish. Power semiconductors are compact IPM (Intelligent Power Module) packages integrating IGBT and drive circuitry. The control board uses a 4-layer PCB with mixed surface-mount and through-hole components. DC bus capacitors are compact snap-in electrolytic types. The heat sink is an extruded aluminum profile with moderate fin density. Front panel is plastic with LED indicators and optional display cutout.

Structural Characteristics The drive features a compact rectangular enclosure designed for DIN rail or panel mounting. Power terminals are screw-type spring clamps suitable for wire up to 2.5 mm². Control connectors are pluggable terminal blocks for easy wiring and maintenance. The front panel includes three status LEDs (power, run, fault) and a potentiometer for analog gain adjustment. Internal layout places the power stage at the bottom with the control board above, separated by a plastic insulator. Cooling is by natural convection with optional fan kit for high ambient temperatures.

Working Principle Single or three-phase 230 VAC input is rectified to approximately 325 VDC bus voltage. The IPM inverter stage generates variable-frequency three-phase output. The control processor implements V/Hz control for induction motors or vector control for servo motors based on configuration. Resolver feedback is converted to digital position information by an RDC (resolver-to-digital converter) chip. The velocity loop compares analog command input against actual velocity. The current loop regulates motor current through PWM duty cycle modulation. Protection circuits monitor bus voltage, output current, and internal temperature.

Installation Requirements

  • Mount on DIN rail or panel surface in an enclosure with minimum IP20 rating
  • Provide minimum 25 mm clearance on all sides for natural convection
  • Connect power through circuit breaker rated for drive input current
  • Use motor power cables of 1.5 mm² minimum cross-section
  • Connect resolver feedback using shielded cable with proper grounding
  • Separate power and control cables by minimum 100 mm
  • Configure drive using front panel or serial interface and Kollmorgen software
  • Set motor parameters (rated current, voltage, speed) before first operation
  • Verify proper grounding of drive chassis and motor frame

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