KOLLMORGEN S71262-NANANA Servo Drive – AKD Series

KOLLMORGEN S71262-NANANA — AKD Series Servo Amplifier in Closed-Loop Motion Control Architecture

The KOLLMORGEN S71262-NANANA is a member of the AKD (Advanced Kollmorgen Drive) family of digital servo amplifiers, designed to deliver deterministic torque, velocity, and position control across multi-axis industrial automation platforms. Operating within a tightly integrated hardware-software stack, this drive interfaces directly with KOLLMORGEN’s KAS (Kollmorgen Automation Suite) environment and supports third-party EtherCAT masters, making it a structurally versatile component in both OEM machine builds and retrofit projects.

Unlike general-purpose inverters, the S71262-NANANA is purpose-built for closed-loop servo operation. Its internal current loop executes at a 16 kHz update rate, while the velocity loop closes at 8 kHz — figures that translate directly into sub-millisecond disturbance rejection and smooth torque delivery even under abrupt load transients. The drive’s FPGA-based control core handles real-time commutation independently of the host CPU, ensuring that fieldbus communication latency does not propagate into the motion execution layer.

In a typical servo axis, the S71262-NANANA occupies the role of the power conversion and closed-loop regulation stage. It receives motion commands from the machine controller via EtherCAT or CANopen, converts them into PWM switching signals at the IGBT bridge, and simultaneously processes encoder or resolver feedback to maintain position accuracy. The drive’s onboard DSP continuously computes the error between commanded and actual position, applying PID correction with feed-forward compensation to minimize following error across the full speed range.

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Technical Parameters

Hardware Logical Analysis

IGBT Bridge & Gate Drive Architecture: The S71262-NANANA employs a three-phase IGBT inverter bridge with integrated gate driver ICs that incorporate desaturation detection and active Miller clamping. Desaturation detection responds within 2 µs to overcurrent conditions, triggering a controlled shutdown sequence that protects both the power stage and the connected motor winding insulation. Active Miller clamping prevents parasitic turn-on of the complementary switch during high dV/dt switching transitions — a critical design consideration in high-speed servo applications where bus voltages can reach 800 V DC.

EMC Design & Conducted Emission Suppression: The drive’s internal EMC filter topology combines a common-mode choke on the AC input stage with X and Y class capacitors referenced to the chassis ground plane. This arrangement attenuates conducted emissions to comply with EN 55011 Class C2 limits without requiring an external line filter in most standard installations. The PCB layout enforces strict separation between the high-current power plane and the signal processing layer, with a dedicated analog ground island for the feedback signal conditioning circuitry. Differential signal routing for encoder lines further reduces susceptibility to radiated interference from adjacent switching devices.

Regenerative Energy Management: During motor deceleration, the S71262-NANANA’s DC bus voltage rises as kinetic energy is returned from the motor. The drive monitors bus voltage in real time and activates the internal braking chopper when the bus exceeds a configurable threshold (typically 800 V for 480 VAC input systems). The chopper switches the braking resistor across the DC bus, dissipating excess energy as heat. For applications with frequent or high-inertia deceleration cycles, an external braking resistor can be connected to the dedicated terminals, with the chopper duty cycle managed automatically by the drive firmware.

Feedback Signal Conditioning: The resolver interface uses a dedicated excitation oscillator operating at 10 kHz, with a tracking resolver-to-digital converter (RDC) that achieves 16-bit angular resolution at full motor speed. For digital encoders (EnDat 2.2, BiSS-C), the interface logic operates at clock rates up to 16 MHz, supporting high-line-count encoders (up to 33-bit absolute) without interpolation error accumulation. The feedback path is galvanically isolated from the power stage ground, with 500 V isolation voltage, preventing ground loop currents from corrupting position data.

Safe Torque Off (STO) Implementation: The STO function is implemented via dual-channel hardware logic that independently disables the gate drive signals to the upper and lower IGBT switches. The STO circuit does not rely on firmware execution — it operates at the hardware level, achieving a response time of less than 1 ms from STO input de-energization to gate signal suppression. This architecture satisfies IEC 62061 SIL 2 and ISO 13849-1 PLd requirements without requiring an external safety relay in the motor circuit.

System Integration Benefits

• Deterministic EtherCAT synchronization: The drive’s EtherCAT slave controller (ESC) supports Distributed Clocks (DC) with a synchronization jitter below 1 µs, enabling precise multi-axis coordination without a dedicated motion bus or hardware cam shaft.
• Plug-and-play motor identification: When connected to KOLLMORGEN AKM or DDL series motors equipped with electronic nameplates, the drive reads motor parameters (Ke, Kt, winding resistance, inductance, thermal model) automatically at power-up, eliminating manual parameter entry and reducing commissioning time.
• Integrated oscilloscope and trace function: WorkBench software provides a 4-channel software oscilloscope with 250 µs sampling resolution, allowing engineers to capture and analyze current, velocity, and position waveforms directly from the drive without external measurement hardware.
• Transparent fault diagnostics: The drive maintains a 32-entry fault history log with timestamp, fault code, and operating state at the time of fault. Each fault code maps to a specific hardware or software condition, reducing mean time to repair (MTTR) in production environments.
• Adaptive current limiting: The drive’s thermal model continuously estimates junction temperature of the IGBT module based on measured output current and ambient temperature. When the estimated junction temperature approaches the thermal limit, the drive proactively reduces peak current capability rather than triggering an abrupt fault, maintaining machine uptime during thermal stress events.
• Dual feedback support for motor and load: A secondary encoder input allows the drive to close the position loop on a load-side encoder while using the motor encoder for commutation. This dual-loop configuration compensates for mechanical compliance (backlash, belt stretch) between the motor shaft and the load, improving positioning accuracy at the point of work.
• Configurable I/O for machine integration: The drive provides multiple digital inputs and outputs, configurable for functions including hardware enable, fault reset, brake control, home switch, and positive/negative limit switches. Analog inputs accept ±10 V command signals for legacy velocity or torque control integration without fieldbus infrastructure.
• Firmware update via fieldbus: Drive firmware can be updated over the EtherCAT network using the FoE (File over EtherCAT) protocol, enabling fleet-wide firmware management without physical access to each drive — a significant operational advantage in large multi-axis installations.

Quality Assurance & Global Logistics

Every KOLLMORGEN S71262-NANANA unit supplied by siemensplc.com is sourced through verified industrial supply channels. Each unit undergoes incoming inspection that includes label authentication, serial number cross-referencing against manufacturer records, and functional power-on verification. Units are stored in an ESD-controlled warehouse environment maintained at 20–25 °C with humidity monitoring, preserving the integrity of electrolytic capacitors and IGBT gate oxide layers during storage.

Shipments originate from our Xiamen, China facility, with access to DHL Express, FedEx International Priority, and UPS Worldwide Express services. In-stock orders placed before 16:00 CST are dispatched the same business day. Transit times to major industrial hubs: Europe 3–5 business days, North America 4–6 business days, Southeast Asia 2–3 business days. All shipments include commercial invoice, packing list, and certificate of conformance. Export classification and HS code documentation are prepared for each shipment to minimize customs clearance delays.

A 12-month warranty covers manufacturing defects under normal operating conditions. Warranty claims are processed with a target response time of 48 hours. Advance replacement units are available for critical production applications subject to prior arrangement.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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