KOLLMORGEN 64WKS-M240/50-RLG Servo Drive – Obsolete BDS Series Spare Part

Technical Dossier

Product Details And Specifications

KOLLMORGEN 64WKS-M240/50-RLG Servo Drive – Obsolete BDS Series Spare Part

When a KOLLMORGEN 64WKS-M240/50-RLG servo drive fails on an active production line, the immediate cost calculation is rarely about the component itself. A single axis failure in a coordinated multi-axis servo system can halt an entire manufacturing cell. If the surrounding motion control architecture — built around legacy KOLLMORGEN BDS-series drives and their proprietary resolver-based feedback loops — is no longer supported by the OEM, the alternative is not a simple swap. It is a full motion system re-engineering project: new drives, new cabling, new tuning, new PLC integration, and in many cases, new mechanical mounts. Conservative estimates for such a retrofit in a mid-scale CNC or packaging line run from USD 150,000 to over USD 500,000, excluding production downtime losses. DriveKNMS maintains verified surplus inventory of the 64WKS-M240/50-RLG specifically to eliminate that scenario. One unit, correctly sourced, protects an asset that took years to commission.

Technical Specifications

Note: Electrical parameters are stated based on model suffix interpretation. Confirm all specifications against your original system documentation before installation. DriveKNMS does not fabricate or estimate parameters.

Solving the Discontinued Hardware Crisis

The KOLLMORGEN BDS-series and its associated 6000-series amplifier platform were widely deployed through the 1990s and early 2000s in precision motion applications: CNC machining centers, semiconductor handling equipment, textile machinery, and industrial robotics. The resolver-based feedback architecture (denoted by the RLG suffix) was a deliberate engineering choice for environments where optical encoders were considered fragile — high-vibration, high-temperature, or contaminated settings.

KOLLMORGEN has since migrated its product line to the AKD and S700 platforms, which use entirely different communication protocols (EtherCAT, SynqNet) and feedback interfaces. There is no direct drop-in replacement from the current catalog for a 64WKS-M240/50-RLG in an existing BDS-architecture system. Substituting a modern drive requires resolver-to-encoder conversion hardware, firmware reconfiguration, and in most cases, re-tuning of all motion profiles — a process that can take weeks of engineering time on a complex machine.

For plant managers operating equipment with 10–20 years of remaining productive life, the calculus is straightforward: sourcing a verified spare 64WKS-M240/50-RLG at a fraction of the retrofit cost preserves capital, avoids re-validation cycles, and keeps the machine running on its original, proven configuration. Holding two to three units in strategic reserve is standard practice for facilities that cannot afford unplanned downtime on this class of equipment.

Condition & Reliability Assurance

Obsolete servo drives present specific failure modes that differ from standard electronic components. DriveKNMS applies a 5-step inspection and reconditioning protocol to every 64WKS-M240/50-RLG unit before it is offered for sale:

Step 1 – Electrolytic Capacitor Assessment: DC bus and filter capacitors are the primary age-related failure point in drives of this vintage. Each unit undergoes capacitance measurement and ESR testing. Capacitors showing degradation beyond manufacturer tolerance are replaced with equivalent-rated components.

Step 2 – Firmware Version Verification: Where accessible, the drive's firmware revision is documented and cross-referenced against known compatibility matrices for the target BDS system version. Mismatched firmware between drive and controller is a common cause of post-installation faults.

Step 3 – Terminal and Pin Corrosion Inspection: All connector pins, power terminals, and resolver interface contacts are inspected under magnification. Oxidized contacts are treated; severely corroded connectors are replaced.

Step 4 – Power-On Functional Test: The unit is energized under controlled conditions and basic drive response is verified. Fault code behavior is logged.

Step 5 – Packaging and ESD Protection: Units are packaged in anti-static materials with desiccant. Long-term storage units receive additional moisture barrier packaging.

Key Features for System Maintenance

Drop-in replacement: The 64WKS-M240/50-RLG installs directly into the existing BDS system slot. No hardware modifications to the machine frame, cable harness, or resolver wiring are required.

No reprogramming required: The replacement drive accepts the existing parameter set from the machine controller. There is no need to re-enter motion profiles, gain settings, or axis configurations — provided the firmware revision is compatible.

Avoids engineering reconstruction costs: Retaining the original drive architecture eliminates the need for system integrator involvement, re-commissioning, and re-validation. For regulated industries (medical device manufacturing, aerospace component machining), this also avoids re-qualification of the production process.

Extends asset life by 5–10 years: A single verified spare, correctly stored, provides the operational insurance needed to run existing equipment through its full economic life cycle without forced capital expenditure on premature system replacement.

FAQ

Q: What warranty applies to a discontinued part like the 64WKS-M240/50-RLG?
A: DriveKNMS provides a standard 12-month warranty on all units sold, covering functional failure under normal operating conditions. Warranty terms are confirmed in writing at the time of sale.

Q: How do I know the unit is genuine and not a counterfeit or misrepresented part?
A: All units are sourced from documented industrial surplus channels. Physical inspection includes label verification, board markings, and component dating. We do not source from unverified secondary markets. Inspection reports are available on request.

Q: Should I buy one unit or hold additional stock?
A: For any system where the 64WKS-M240/50-RLG is a single point of failure, holding a minimum of two units is recommended. Global surplus inventory for this model is finite and decreases over time. Procurement cost today is significantly lower than emergency sourcing cost during an unplanned outage.