Kollmorgen 443M-S S403AM-SE Replacement for AKD Series

Product Overview

Kollmorgen 443M-S S403AM-SE Replacement for AKD Series: Smooth Transition & Legacy System Compatibility

The Kollmorgen 443M-S S403AM-SE is a high-performance AC servo drive from the AKD Series, engineered for precision motion control in demanding industrial automation environments. Whether you are replacing a failed unit, upgrading from an end-of-life servo amplifier, or modernizing a legacy servo system, this drive delivers a seamless migration path with minimal rewiring, no PLC reprogramming, and full backward compatibility with existing AKD motor feedback and power wiring standards.

Industrial facilities running older Kollmorgen S300, S600, or SERVOSTAR 600 series drives frequently encounter obsolescence challenges — discontinued firmware support, unavailable spare parts, and increasing mean-time-to-repair. The 443M-S S403AM-SE provides a direct upgrade route, preserving your existing motor cabling, resolver or encoder feedback wiring, and control cabinet footprint. The drive accepts standard 3-phase AC input and is compatible with the AKD WorkBench commissioning software, allowing engineers to import existing parameter sets and reduce on-site commissioning time significantly.

For multi-axis systems, the 443M-S S403AM-SE integrates natively into Kollmorgen AKD-N distributed servo node architectures and supports synchronization via EtherCAT (CoE/EoE) and CANopen DS402 motion profiles. This makes it a drop-in replacement candidate for systems previously controlled via PROFIBUS-DP or analog ±10V command interfaces, with appropriate gateway modules such as the AKD-B gateway or third-party EtherCAT-to-PROFIBUS converters already in use at the cabinet level.

During a typical retrofit, engineers will verify the DC bus voltage compatibility, confirm the motor feedback type (SFD3, EnDat 2.2, Hiperface, or resolver), and match the continuous and peak current ratings. The 443M-S S403AM-SE’s compact form factor fits standard DIN-rail or panel-mount configurations, making it suitable for replacement in tight control cabinet layouts where space is a critical constraint. The drive’s integrated safe torque off (STO) function meets SIL 2 / PLd safety requirements, ensuring compliance with existing machine safety architectures without additional external safety relays in most configurations.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from a legacy servo system to the 443M-S S403AM-SE typically involves coordinating several interconnected components within the same control cabinet or machine architecture. For multi-axis applications, the AKD-B shared DC bus module allows multiple AKD drives to share a common DC bus, reducing overall energy consumption and simplifying cabinet wiring compared to individual rectifier stages used in older SERVOSTAR installations.

If your existing system uses a Kollmorgen KAS (Kollmorgen Automation Suite) controller or an AKD PDMM (Programmable Drive with Multi-axis Master), the 443M-S S403AM-SE integrates directly via EtherCAT without requiring additional motion controller hardware. For systems migrating from PROFIBUS-based PLCs — such as Siemens S7-300 or S7-400 series controllers — an EtherCAT master gateway or a PROFIBUS-to-EtherCAT coupler (e.g., Beckhoff EL6731 or HMS Anybus X-gateway) is typically added at the rack level to bridge the communication protocol gap.

Terminal block wiring adapters and I/O breakout modules are commonly used during the transition to preserve existing field wiring from sensors, limit switches, and encoder outputs. Signal isolators may be required where legacy analog command signals (±10V) interface with the new drive’s differential input stage, particularly in environments with high electrical noise from VFDs or large motor starters sharing the same cabinet.

For feedback wiring, if the existing motor uses a resolver rather than a digital encoder, the AKD’s onboard resolver interface eliminates the need for an external resolver-to-digital converter (RDC) module. Motors from the Kollmorgen AKM Series, TBM Series, or compatible third-party servo motors with standard feedback connectors can be connected directly using existing cable assemblies, avoiding costly motor replacement during the retrofit.

Power supply considerations are straightforward: the 443M-S S403AM-SE operates from standard industrial 24 VDC logic supply (typically sourced from a Kollmorgen or third-party 24V SMPS already present in the cabinet) and draws 3-phase AC power from the existing servo transformer or line filter. If the legacy system used a Kollmorgen PST power supply module or a shared bus capacitor bank, these can often be retained during the upgrade, reducing retrofit material costs.

For HMI integration, the drive’s status and diagnostic data can be surfaced via EtherCAT to any compatible HMI panel — including Kollmorgen AKD HMI accessories or third-party panels running on the same EtherCAT network — providing operators with real-time torque, velocity, and fault status without additional wiring. Programming cables compatible with the AKD WorkBench USB interface are available separately for initial commissioning and parameter backup.

Retrofit Guidance FAQ

Q: Can I reuse my existing motor power and feedback cables?
A: In most cases, yes. The 443M-S S403AM-SE uses standard AKD motor connector pinouts. If your existing cables were manufactured for AKD or SERVOSTAR 600 series drives, they are typically directly compatible. For motors with non-standard connectors, a cable adapter or re-termination at the drive end is sufficient.

Q: Do I need to rewrite my PLC program after replacing the drive?
A: Not necessarily. If your PLC communicates via CANopen DS402 or EtherCAT CoE, the motion function blocks and axis object mappings remain the same. For analog ±10V command systems, no PLC changes are required at all — only the drive parameters need to be configured via AKD WorkBench.

Q: Will the drive fit in my existing control cabinet?
A: The AKD S403AM form factor is compact and designed for panel-mount or DIN-rail installation. In most cabinets previously housing S300 or SERVOSTAR 600 drives, the 443M-S S403AM-SE fits within the same or smaller footprint, freeing space for additional I/O modules or terminal blocks.

Q: How do I handle the communication protocol change from PROFIBUS to EtherCAT?
A: A PROFIBUS-to-EtherCAT gateway module is installed between the PLC and the AKD drive. This gateway maps PROFIBUS DP process data to EtherCAT PDOs transparently, requiring only minor PLC configuration changes (GSD file update and I/O address remapping) rather than a full program rewrite.

Q: What is the physical installation space requirement?
A: The 443M-S S403AM-SE requires standard panel-mount clearances per Kollmorgen AKD installation guidelines — typically 50 mm side clearance for airflow and 100 mm top/bottom clearance. Ensure the cabinet has adequate ventilation or forced-air cooling if multiple drives are installed in close proximity.

Q: How long does on-site commissioning typically take?
A: For a single-axis replacement with existing parameter backup, commissioning via AKD WorkBench typically takes 2–4 hours including auto-tuning. Multi-axis systems with EtherCAT topology changes may require a full day of commissioning and network verification.

Warranty Assurance

Every Kollmorgen 443M-S S403AM-SE unit supplied by TOPNLMS is covered by a 12-Month Warranty from the date of shipment. Prior to dispatch, each unit undergoes a multi-point outgoing inspection including power-on functional verification, communication interface testing, and visual inspection for physical integrity. Units that do not pass inspection are not shipped.

In the event of a warranty claim, TOPNLMS provides replacement support with priority processing. Our technical team is available to assist with fault diagnosis, parameter recovery, and commissioning guidance remotely to minimize your system downtime. Warranty coverage includes manufacturing defects and functional failures under normal operating conditions as specified in the Kollmorgen AKD Series technical documentation.

Stock is maintained in Xiamen, China, with express international shipping available to most destinations. Lead time for in-stock units is typically 3–7 business days door-to-door for standard international freight, with expedited options available upon request. All units are shipped with appropriate ESD-protective packaging and export documentation.

For procurement inquiries, bulk pricing, or technical pre-sales support, contact our team directly:

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