KOLLMORGEN DIGIFAS 7200 Digital Servo Amplifier – DIGIFAS Series

KOLLMORGEN DIGIFAS 7200 — Full-Digital Servo Amplifier for Deterministic Motion Control

In closed-loop servo architectures, the amplifier stage is the final arbitration point between a motion controller’s commanded trajectory and the physical response of the motor shaft. Any latency, gain instability, or current-loop bandwidth limitation at this stage propagates directly into positioning error, velocity ripple, and ultimately, process defects. The KOLLMORGEN DIGIFAS 7200 addresses this constraint through a fully digital control topology that eliminates the thermal drift and component aging inherent in analog current-loop implementations, delivering consistent closed-loop bandwidth across the operational lifetime of the drive.

The DIGIFAS 7200 belongs to KOLLMORGEN’s DIGIFAS series — a product line developed to serve mid-to-high power servo applications in machine tools, robotics, semiconductor handling, and packaging automation. KOLLMORGEN’s servo engineering heritage, spanning several decades of OEM deployments across North America, Europe, and Asia-Pacific, is embedded in the DIGIFAS architecture: the drive is designed not as a general-purpose inverter with servo firmware, but as a purpose-built servo amplifier where current-loop execution, feedback processing, and fault management are co-designed at the hardware level.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Detailed sub-variant electrical ratings (AC input voltage range, peak/continuous output current, bus voltage) vary by suffix code. Provide the complete part number when submitting an RFQ to ensure exact specification matching.

Hardware Logical Analysis

The DIGIFAS 7200’s control architecture is structured around a dedicated DSP core that executes the current regulation loop at a fixed, deterministic sampling interval — typically in the range of 62.5 µs to 125 µs depending on firmware configuration. This hard real-time execution model is fundamentally different from software-scheduled current loops found in general-purpose inverters, where OS task preemption can introduce jitter that manifests as audible motor noise and velocity ripple at low speeds.

Current Loop Topology: The drive implements a synchronous frame (d-q axis) current regulator for permanent-magnet servo motors. By decoupling the flux-producing (d-axis) and torque-producing (q-axis) current components, the regulator achieves linear torque response across the full speed range without cross-coupling distortion. PI gains for both axes are independently tunable, allowing the drive to be optimized for motors with widely varying inductance profiles — from low-inductance, high-pole-count frameless motors to conventional wound-stator designs.

Feedback Signal Processing: Encoder signals are processed through dedicated hardware interpolation logic rather than firmware polling, which eliminates quantization-induced velocity estimation noise at low shaft speeds. For resolver-equipped variants, the resolver-to-digital converter (RDC) operates with a tracking loop bandwidth sufficient to maintain position accuracy during rapid acceleration transients. The feedback path includes hardware-level signal integrity monitoring: loss of encoder signal or resolver excitation triggers an immediate controlled stop sequence rather than a latched fault that requires a power cycle.

EMC Design: The DIGIFAS 7200’s power stage employs a switching frequency and gate-drive topology selected to balance switching loss against conducted EMI generation. Internal common-mode chokes on the DC bus and motor output lines attenuate high-frequency common-mode currents that would otherwise couple into adjacent signal wiring. The drive’s chassis is designed for direct bonding to the control cabinet’s equipotential bonding rail, providing a low-impedance return path for shield currents — a critical detail in installations where encoder cables run parallel to power conductors over distances exceeding 10 meters.

Thermal Management: The power module’s thermal interface is designed for forced-air cooling with a defined airflow direction, allowing predictable thermal derating curves to be applied during system sizing. Onboard NTC thermistors monitor both the power module junction temperature and the ambient temperature inside the drive enclosure; the firmware implements a two-stage thermal protection: a warning threshold that reduces peak current capability, and a shutdown threshold that executes a controlled deceleration before disabling the output stage — preserving motor and mechanical load integrity rather than executing an instantaneous torque cutoff.

System Integration Benefits

• Deterministic Current Loop Latency: Fixed DSP execution cycle eliminates jitter-induced velocity ripple, enabling smooth motion at speeds below 10 RPM — critical for precision grinding and polishing applications.
• Multi-Mode Command Flexibility: Analog ±10 V, pulse/direction, and serial interfaces allow the DIGIFAS 7200 to integrate with legacy CNC controllers, modern PLC motion modules, and PC-based motion platforms without hardware modification.
• Transparent Fault Diagnostics: Fault codes are accessible via front-panel display and serial interface, providing unambiguous identification of fault origin (power stage, feedback, communication, or thermal) — reducing mean time to diagnose (MTTD) compared to drives with generic fault indicators.
• Motor Compatibility Breadth: Compatible with KOLLMORGEN AKM, Goldline, and BDS series motors, as well as third-party permanent-magnet servo motors with equivalent feedback types, protecting existing motor capital investment during drive replacement projects.
• Controlled Stop on Fault: Configurable deceleration ramp on fault detection prevents mechanical shock to gearboxes, ballscrews, and tooling — a measurable reduction in maintenance cost in high-cycle applications.
• Independent d-q Axis Gain Tuning: Allows the drive to be optimized for motors with non-standard inductance ratios, including high-pole-count direct-drive motors where conventional auto-tuning algorithms produce suboptimal results.
• Low-Speed Torque Ripple Suppression: Hardware encoder interpolation and synchronous frame current regulation combine to minimize cogging-induced torque ripple at low speeds, directly improving surface finish quality in machine-tool applications.
• Thermal Derating Transparency: Two-stage thermal protection with accessible temperature telemetry allows system integrators to design thermal management strategies based on measured data rather than worst-case assumptions, enabling higher continuous duty cycles in thermally constrained cabinets.

Quality Assurance & Global Logistics

Every KOLLMORGEN DIGIFAS 7200 unit supplied through siemensplc.com is sourced as genuine OEM hardware — no third-party remanufacturing, no counterfeit risk. Each unit undergoes a structured pre-shipment verification process:

• Visual and Mechanical Inspection: PCB assemblies, connector housings, and front-panel components are examined for physical damage, corrosion, or evidence of unauthorized repair.
• Power-On Functional Test: Drive is energized to confirm firmware initialization, fault-free boot sequence, and correct response to command inputs.
• Parameter Integrity Check: Factory default parameters are verified against known-good reference data for the specific model variant.
• ESD-Safe Packaging: Units are packed in anti-static shielding bags, cushioned with closed-cell foam, and placed in double-wall corrugated cartons rated for international air freight handling.
• 12-Month Warranty: All units carry a 12-month warranty from the date of shipment, covering manufacturing defects and functional failure under normal operating conditions.

Shipments originate from our warehouse in Xiamen, China — a major international logistics hub with direct access to DHL Express, FedEx International Priority, and UPS Worldwide Express services. Standard transit times to major industrial centers: Europe 3–5 business days, North America 4–6 business days, Southeast Asia 2–3 business days. Full export documentation, including commercial invoice, packing list, and certificate of origin, is provided with every shipment. For orders requiring expedited customs clearance, our logistics team coordinates directly with freight forwarders experienced in industrial electronics import procedures.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.