Kollmorgen SERVOSTAR 443M-P S403AM-PB Servo Drive – SERVOSTAR Series

Kollmorgen SERVOSTAR 443M-P S403AM-PB — Digital Servo Drive in Closed-Loop Motion Architecture

The Kollmorgen SERVOSTAR 443M-P (catalog part number S403AM-PB) is a panel-mount digital servo drive module belonging to the SERVOSTAR 400 series. Within a closed-loop motion control system, this drive occupies the power conversion and current regulation layer — receiving velocity or position commands from an upstream motion controller and translating them into precisely modulated three-phase output current to the connected brushless AC servo motor. The drive executes its current control loop at a fixed PWM switching cycle, maintaining torque linearity across the full speed range without the drift characteristics inherent to analog amplifier designs.

The 443M-P designation encodes the drive’s continuous output current rating within the SERVOSTAR 400 platform. The S403AM-PB part number suffix identifies the specific hardware configuration, including the installed fieldbus option card and brake chopper circuit variant. Engineers specifying this unit for replacement or new-build applications should cross-reference both the model number and part number to confirm hardware revision compatibility with existing cabinet wiring and parameter files.

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

Technical Parameters

Hardware Logical Analysis

The SERVOSTAR 443M-P is built on a fully digital signal processor (DSP) control architecture. The current regulation loop runs at the PWM carrier frequency — nominally 8 kHz — giving a current loop bandwidth that supports mechanical bandwidths well above 100 Hz in stiff transmission systems. This is a fundamental architectural distinction from earlier analog servo amplifiers, where bandwidth was constrained by RC filter time constants and op-amp slew rates.

EMC Design: The drive’s internal DC bus is decoupled from the AC input stage by a bulk capacitor bank sized to absorb regenerative energy pulses without exceeding the bus voltage clamp threshold. The gate driver stage uses isolated IGBT drivers with defined dead-time insertion to prevent shoot-through, which also reduces conducted EMI on the motor cable. For installations requiring EN 61800-3 Category C2 compliance, an external line filter is specified in the Kollmorgen application guide — the drive’s internal common-mode choke reduces high-frequency leakage current to the PE conductor, protecting adjacent signal wiring in shared cable trays.

Feedback Signal Conditioning: The resolver interface uses a dedicated excitation oscillator running at a fixed carrier frequency (typically 8–10 kHz), with synchronous demodulation of the sin/cos return signals. This approach rejects common-mode noise on the feedback cable and maintains position resolution equivalent to 12–14 bits per revolution at the resolver shaft — sufficient for most servo axis applications without requiring a high-resolution optical encoder. For applications demanding finer resolution, the SinCos encoder interface interpolates the 1 Vpp differential signals internally to achieve sub-micron position feedback at the motor shaft.

Brake Chopper Circuit (PB suffix): The S403AM-PB variant includes an integrated braking transistor and external resistor connection terminals. During deceleration, regenerated energy from the motor is dissipated through the braking resistor when the DC bus voltage exceeds the chopper threshold (typically 390 VDC on a 400 VAC supply). This eliminates the need for a separate braking module in single-axis cabinets and simplifies the BOM for machine builders.

Thermal Management: The drive’s power stage is mounted on an internal heatsink with a forced-air fan. An NTC thermistor monitors heatsink temperature and triggers a pre-fault warning at a configurable threshold before the hardware over-temperature shutdown activates. This allows the motion controller to execute a controlled stop sequence rather than an abrupt power cut, protecting both the mechanical load and the motor windings.

System Integration Benefits

• Deterministic Current Loop Execution: The DSP-based current regulator runs synchronously with the PWM cycle at 8 kHz, eliminating jitter in torque output and enabling consistent axis response across all operating points — critical for multi-axis interpolation in CNC and robotics applications.
• Unified Parameter Management via WorkBench: Kollmorgen’s WorkBench commissioning software provides a single interface for drive parameter upload/download, oscilloscope-style trace capture, and auto-tuning. Parameter files are stored in non-volatile memory on the drive, allowing rapid replacement without manual re-entry of gain values.
• Fieldbus Transparency: With the appropriate option card, the drive maps its internal status registers — including actual current, velocity, position error, and fault codes — directly onto the fieldbus process data object (PDO) structure. The PLC or motion controller can read diagnostic data in real time without interrupting the motion task.
• Scalable Multi-Axis Architecture: The SERVOSTAR 400 series uses a shared DC bus topology when multiple drives are mounted in a common cabinet. Regenerative energy from decelerating axes is absorbed by accelerating axes on the same bus, reducing peak demand on the AC supply and lowering the required input transformer rating.
• Motor Compatibility Breadth: The drive’s auto-identification routine reads motor data from a connected Kollmorgen AKM motor’s electronic nameplate (stored in the feedback device EEPROM), automatically loading rated current, pole count, and thermal model parameters. This reduces commissioning time and eliminates manual data entry errors.
• Fault Logging and Diagnostics: The drive maintains a non-volatile fault history buffer recording the last 32 fault events with timestamp, operating mode, and bus voltage at the time of fault. This data is accessible via WorkBench or fieldbus, enabling root-cause analysis without requiring an oscilloscope at the machine.
• Safe Torque Off (STO) Readiness: The SERVOSTAR 400 platform supports STO (IEC 62061 / EN 13849) via a dedicated hardware input that disables the gate driver stage without removing control power. This allows the safety relay circuit to inhibit motor torque while preserving drive communication and position feedback — enabling faster restart after a safety event compared to full power cycling.
• Configurable I/O for Machine Integration: The drive provides programmable digital inputs and outputs that can be mapped to functions including enable, fault reset, brake release, in-position window, and velocity reached. This reduces the number of PLC I/O points required for drive interfacing and simplifies ladder logic in the machine controller.

Quality Assurance & Global Logistics

Every Kollmorgen SERVOSTAR 443M-P S403AM-PB unit supplied by siemensplc.com is sourced as genuine OEM hardware through verified industrial distribution channels. Units are inspected upon receipt for physical integrity, label authenticity, and firmware revision consistency with Kollmorgen’s published release history. No remanufactured or remarked components are supplied without explicit disclosure.

Shipments originate from our warehouse in Xiamen, China — a major port city with direct access to international express freight networks. Standard export packaging uses anti-static foam inserts and moisture-barrier bags rated for air and sea freight. For time-critical orders, DHL Express and FedEx International Priority services provide door-to-door delivery to most destinations within 3–5 business days. Sea freight consolidation is available for bulk orders where lead time permits.

Export documentation — including commercial invoice, packing list, certificate of origin, and HS code classification (8537.10 or 8504.40 depending on customs jurisdiction) — is prepared for every international shipment. For regulated industries requiring traceability, lot number and date code records are retained for a minimum of 3 years post-shipment.

All units carry a 12-month warranty from the date of shipment, covering manufacturing defects and component failure under normal operating conditions. Warranty claims are processed with a target response time of 48 hours from receipt of the defective unit.

Contact Information

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