Kollmorgen S-Series Servo Drives: S7240S-NANAPM

Technical Dossier

Product Details And Specifications

Kollmorgen S-Series Servo Drives: Comprehensive Module Range and Technical Overview

The Kollmorgen S-Series servo drives represent one of the most widely deployed motion control platforms in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, offshore drilling rigs, and continuous-process manufacturing lines, the S-Series established Kollmorgen's position as a tier-one supplier for precision motion applications requiring deterministic torque and velocity control. The S7240S-NANAPM is a representative model within this family, designed for high-dynamic servo axis control with analog command interface and pulse-width modulation output architecture. Across facilities in North America, Europe, and Asia-Pacific, S-Series drives remain embedded in legacy motion systems where replacement with newer platforms carries significant re-engineering cost and downtime risk.

The Evolution of S-Series Architecture

The Kollmorgen S-Series traces its lineage to the Servostar and BDS/SDS drive families developed in the 1990s, which established the analog ±10 V command interface and resolver-based feedback as the standard for high-performance servo axes. Early S-Series units operated on isolated analog command buses and required external motion controllers for trajectory generation. Mid-generation revisions introduced digital parameter storage via non-volatile EEPROM, enabling repeatable tuning across drive replacements without manual potentiometer adjustment. Later variants added optional fieldbus interface cards (CANopen, PROFIBUS-DP) to support integration into distributed control architectures without replacing the core power stage. The S7240S-NANAPM designation encodes key configuration data: the 72 prefix indicates the 7.2 A continuous / 24 A peak current rating, the 40 suffix denotes the 400 V AC input class, S indicates single-axis topology, NA specifies the North American market configuration, NA the analog command variant, and PM the permanent magnet motor compatibility class. As the S-Series has entered its end-of-production phase, compatibility with legacy resolver and analog tachometer feedback devices remains the primary reason these drives are retained in service rather than migrated to current-generation AKD or AKD2G platforms.

S-Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Kollmorgen S-Series servo drive family. Each entry reflects a distinct current rating, voltage class, or interface configuration.

S7240S-NANAPM: 7.2 A cont. / 24 A pk, 400 V, analog cmd, PM motor, single-axis
S3240S-NANAPM: 3 A cont. / 9 A pk, 400 V, analog cmd, PM motor, single-axis
S6240S-NANAPM: 6 A cont. / 18 A pk, 400 V, analog cmd, PM motor, single-axis
S1240S-NANAPM: 1 A cont. / 3 A pk, 400 V, analog cmd, PM motor, single-axis
S2240S-NANAPM: 2 A cont. / 6 A pk, 400 V, analog cmd, PM motor, single-axis
S4240S-NANAPM: 4 A cont. / 12 A pk, 400 V, analog cmd, PM motor, single-axis
S7240S-NANAPB: 7.2 A cont. / 24 A pk, 400 V, analog cmd, PM motor, PROFIBUS-DP option
S7240S-NANACN: 7.2 A cont. / 24 A pk, 400 V, analog cmd, PM motor, CANopen option
S7220S-NANAPM: 7.2 A cont. / 24 A pk, 200 V, analog cmd, PM motor, single-axis
S3220S-NANAPM: 3 A cont. / 9 A pk, 200 V, analog cmd, PM motor, single-axis
S6220S-NANAPM: 6 A cont. / 18 A pk, 200 V, analog cmd, PM motor, single-axis
S1220S-NANAPM: 1 A cont. / 3 A pk, 200 V, analog cmd, PM motor, single-axis
S2220S-NANAPM: 2 A cont. / 6 A pk, 200 V, analog cmd, PM motor, single-axis
S4220S-NANAPM: 4 A cont. / 12 A pk, 200 V, analog cmd, PM motor, single-axis
S7240S-NANAPD: 7.2 A cont. / 24 A pk, 400 V, digital cmd interface, PM motor, single-axis
S14240S-NANAPM: 14 A cont. / 42 A pk, 400 V, analog cmd, PM motor, single-axis
S20240S-NANAPM: 20 A cont. / 60 A pk, 400 V, analog cmd, PM motor, single-axis

Sourcing Hard-to-Find & Obsolete S-Series Parts

Kollmorgen has formally transitioned the S-Series to end-of-life status, with production of new units discontinued and OEM spare parts inventory progressively depleted through authorized distribution channels. For facilities operating S-Series drives in long-lifecycle applications — including nuclear auxiliary systems, refinery compressor trains, and continuous casting lines — the inability to source replacement units represents a critical maintenance risk. DriveKNMS maintains a dedicated inventory of S-Series drives sourced through controlled secondary market channels, including decommissioned OEM equipment, factory-surplus stock, and tested pull units from plant shutdowns. All units are catalogued by full part number including suffix codes, ensuring configuration-accurate replacement. For models such as the S7240S-NANAPM where the analog command interface and resolver feedback are non-negotiable constraints, DriveKNMS provides exact-match sourcing rather than cross-reference substitution. Extended lifecycle support contracts are available for facilities requiring guaranteed availability over multi-year maintenance windows.

Quality Control for the S-Series Range

S-Series drives incorporate a multi-layer power stage architecture combining IGBT switching modules, gate driver isolation circuits, and resolver-to-digital converter (RDC) signal chains that require systematic validation before redeployment. DriveKNMS applies a structured test protocol to all S-Series units: incoming inspection verifies physical integrity of the DC bus capacitor bank, IGBT module, and feedback connector assembly. Functional testing is performed on a dedicated servo test bench using a matched Kollmorgen permanent magnet motor load, validating current loop bandwidth, velocity loop stability, and fault response across the full operating current range. Resolver signal integrity is verified at both low-speed (< 10 RPM) and rated speed to confirm RDC accuracy within ±1 LSB. Parameter memory is read and archived prior to any bench operation, and restored to factory default before shipment unless the customer specifies a pre-loaded parameter set. Units exhibiting DC bus leakage, gate driver asymmetry, or RDC offset errors are quarantined and not offered for sale.