Parker Compax-S Modules: CPX2570S/E2/E3/F8/S1

Technical Dossier

Product Details And Specifications

Parker Compax-S Series: Comprehensive Module Range and Technical Overview

The Parker Compax-S series is a family of compact digital servo drives developed by Parker Hannifin, designed for precision motion control in demanding industrial environments. Deployed across chemical processing plants, oil refineries, nuclear facilities, and continuous-process manufacturing lines, the Compax-S platform has established a significant installed base in applications requiring deterministic torque, velocity, and position control. Its modular option-card architecture allows system integrators to configure drives for specific fieldbus protocols, feedback devices, and safety functions without replacing the base unit — a design philosophy that extended the series' operational lifespan well beyond typical product cycles.

The Evolution of Compax-S Architecture

The Compax-S series succeeded Parker's earlier Compax and Compax-M platforms, consolidating analog and early digital drive technologies into a unified DSP-based architecture. The base drive designation follows the format CPX[current]S, where the current rating (e.g., 2570 = 25 A continuous / 70 A peak) defines the power stage. Option slots — designated E, F, and S suffixes — accept plug-in cards that determine fieldbus interface, feedback type, and safety certification.

Early Compax-S units shipped with RS-232/RS-485 commissioning interfaces and supported resolver and incremental encoder feedback. Subsequent hardware revisions introduced HIPERFACE and EnDat 2.1 absolute encoder compatibility (E3 option), CANopen and PROFIBUS-DP fieldbus cards (F-series options), and STO (Safe Torque Off) safety modules (S1 option) compliant with EN 954-1 Category 3 and later IEC 62061 SIL 2. The architecture remained backward-compatible at the mechanical and wiring level across most revisions, allowing field replacement of option cards without full drive replacement.

The Compax-S series has entered the mature/end-of-life phase. Parker Hannifin has transitioned new designs toward the Compax3 and subsequently the ACR/IPA servo platforms. Compax-S units remain in active service at sites where full drive replacement would require requalification of safety-critical processes. Long-term maintenance support — including spare drives, option cards, and firmware — is the primary procurement driver for this series.

Compax-S Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Parker Compax-S product family, organized by functional category. Each model designation reflects the base drive rating and installed option card configuration.

Base Drive Units (Power Stage)

• CPX2570S: 25 A cont. / 70 A peak base servo drive, no option cards installed
• CPX1040S: 10 A cont. / 40 A peak compact base drive for low-inertia axes
• CPX4090S: 40 A cont. / 90 A peak mid-range drive for high-torque servo motors
• CPX55150S: 55 A cont. / 150 A peak high-current drive for large-frame motors

Feedback Interface Options (E-Slot Cards)

• CPX2570S/E2: Resolver feedback interface card, 2-pole to 16-pole resolver compatible
• CPX2570S/E3: HIPERFACE / EnDat 2.1 absolute encoder interface, single-turn and multi-turn
• CPX1040S/E2: Resolver card variant for 10 A base drive
• CPX4090S/E3: Absolute encoder card for 40 A base drive

Fieldbus Communication Options (F-Slot Cards)

• CPX2570S/F8: CANopen DS402 fieldbus card, 1 Mbit/s, CiA 402 motion profile
• CPX2570S/F4: PROFIBUS-DP slave card, 12 Mbit/s, GSD file configurable
• CPX2570S/F5: DeviceNet adapter card, Group 2 slave, 500 kbit/s
• CPX4090S/F8: CANopen card for 40 A drive variant
• CPX1040S/F4: PROFIBUS-DP card for 10 A drive variant

Safety & Fully Configured Assemblies

• CPX2570S/S1: Safe Torque Off (STO) safety module, EN 954-1 Cat. 3 / SIL 2
• CPX2570S/E2/E3/F8/S1: Fully configured assembly — resolver + absolute encoder + CANopen + STO; the subject SKU of this listing
• CPX4090S/E3/F4/S1: 40 A drive with absolute encoder, PROFIBUS-DP, and STO safety
• CPX55150S/E2/F8: High-current drive with resolver feedback and CANopen fieldbus
• CPX1040S/E3/F5/S1: Compact drive with absolute encoder, DeviceNet, and STO

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

DriveKNMS maintains a dedicated inventory program for Parker Compax-S components, including base drives, individual option cards, and fully configured assemblies. As Parker Hannifin has discontinued active production of the Compax-S line, procurement through the OEM channel is no longer reliable for most SKUs. DriveKNMS sources units through certified secondary-market channels, decommissioned plant inventories, and direct partnerships with industrial surplus distributors.

For sites operating Compax-S drives in safety-classified environments (SIL 2 loops, Category 3 safety circuits), DriveKNMS provides documentation packages including original Parker firmware version records, option card revision histories, and test certificates to support site requalification procedures. Replacement units are matched to the original hardware revision where process documentation requires exact-model substitution.

Quality Control for the Compax-S Range

Each Compax-S unit processed by DriveKNMS undergoes a structured inspection and functional test protocol specific to the drive's installed option card configuration. The test sequence includes: DC bus capacitor ESR measurement and reformation where applicable; power stage IGBT gate drive integrity check; option card slot connector inspection for pin damage and oxidation; resolver and encoder interface signal verification using a calibrated motor simulator; fieldbus communication validation (CANopen NMT state machine, PROFIBUS-DP data exchange) using protocol analyzers; and STO channel functional test per IEC 62061 diagnostic coverage requirements. Drives with F8 (CANopen) cards are tested against DS402 state machine compliance. Units with S1 safety cards are tested for STO response time and channel independence before dispatch.