YASKAWA CACR-1E Series Servo Controllers

Technical Dossier

Product Details And Specifications

YASKAWA CACR-1E Series: Comprehensive Module Range and Technical Overview

The YASKAWA CACR-1E series represents a foundational generation of analog servo controllers engineered for precision motion control in heavy industrial environments. Deployed extensively across petrochemical refineries, nuclear power auxiliary systems, steel rolling mills, and large-scale chemical processing plants, the CACR-1E platform established YASKAWA's position as a primary supplier of servo drive technology for continuous-process industries. These units interface directly with YASKAWA's Σ (Sigma) series servo motors and are designed for single-axis positioning, velocity control, and torque regulation in demanding duty cycles. The series operates on a dedicated analog command interface, making it a standard retrofit and replacement target in legacy DCS and relay-logic-controlled machinery still in active service globally.

The Evolution of CACR-1E Architecture

The CACR-1E series was introduced as part of YASKAWA's first-generation analog servo amplifier lineup, predating the digital SGDA, SGDB, and SGDH families. Its architecture is built around analog current-loop and velocity-loop control with external potentiometer-based gain tuning — a design paradigm common to servo systems of the 1980s and early 1990s. The series accepts ±10 VDC analog speed reference signals and provides encoder feedback via incremental A/B/Z pulse outputs.

As industrial automation migrated toward digital fieldbus architectures (MECHATROLINK-II, EtherCAT, PROFIBUS), the CACR-1E was superseded by the SGDV (Σ-V) and SGDH (Σ-II) series, which introduced auto-tuning, digital parameter storage, and network communication. However, the CACR-1E remains in active service in facilities where full system replacement is cost-prohibitive. Compatibility constraints include: motor cable pinout differences versus Σ-V motors, non-interchangeable encoder connectors, and analog-only command interfaces incompatible with modern motion controllers without signal conditioning hardware.

For facilities operating CACR-1E units, the primary lifecycle challenge is sourcing replacement amplifiers and sub-assemblies, as YASKAWA has discontinued active production. DriveKNMS maintains a dedicated inventory of tested CACR-1E units and sub-components to support extended service life.

CACR-1E Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the YASKAWA CACR-1E servo controller series, classified by rated output and motor compatibility:

CACR-1E-AM1VA-E: Single-axis analog servo amplifier, 200 VAC input, small-frame motor compatibility, standard encoder feedback.
CACR-1E-AM2VA-E: Single-axis analog servo amplifier, 200 VAC, medium-frame motor, enhanced current rating.
CACR-1E-AM3VA-E: Single-axis analog servo amplifier, 200 VAC, large-frame motor, high-torque application.
CACR-1E-AM1WA-E: Single-axis analog servo amplifier, 100 VAC input, small-frame motor, low-voltage variant.
CACR-1E-AM2WA-E: Single-axis analog servo amplifier, 100 VAC, medium-frame motor, low-voltage variant.
CACR-1E-AM1BA-E: Single-axis servo amplifier with integrated dynamic braking resistor circuit.
CACR-1E-AM2BA-E: Medium-frame servo amplifier with dynamic braking, 200 VAC.
CACR-1E-AM3BA-E: Large-frame servo amplifier with dynamic braking, high-inertia load support.
CACR-1E-AM1CA-E: Single-axis amplifier with external regenerative resistor terminal, 200 VAC.
CACR-1E-AM2CA-E: Medium-frame amplifier with external regenerative resistor terminal.
CACR-1E-AM3CA-E: Large-frame amplifier with external regenerative resistor terminal, high-power.
CACR-1E-AM1DA-E: Single-axis amplifier, 200 VAC, with position control pulse input interface.
CACR-1E-AM2DA-E: Medium-frame amplifier with pulse train position command input.
CACR-1E-AM3DA-E: Large-frame amplifier with pulse train position command, high-torque.
CACR-1E-AM1EA-E: Single-axis amplifier with extended I/O terminal block for PLC interfacing.
CACR-1E-AM2EA-E: Medium-frame amplifier with extended I/O, 200 VAC, PLC-ready.
CACR-1E-AM3EA-E: Large-frame amplifier with extended I/O, high-current output stage.

Sourcing Hard-to-Find & Obsolete CACR-1E Parts

The CACR-1E series has been formally discontinued by YASKAWA. Standard distribution channels no longer carry new stock, and lead times through OEM repair programs can exceed 16–24 weeks where service is available at all. DriveKNMS operates as a specialized independent supplier for legacy YASKAWA servo hardware, maintaining physical inventory of CACR-1E units sourced from decommissioned plant equipment, controlled factory overstock, and verified secondary market channels.

All units offered by DriveKNMS are subject to pre-sale functional verification. For end-users requiring long-term maintenance contracts or multi-unit blanket orders to cover planned maintenance windows, DriveKNMS provides structured supply agreements with guaranteed unit availability and documented test records. This service is specifically designed for facilities in the chemical, oil & gas, and power generation sectors where unplanned downtime carries significant operational cost.

Quality Control for the CACR-1E Range

CACR-1E servo amplifiers present specific test challenges due to their analog control architecture and age-related component degradation patterns. DriveKNMS applies the following verification protocol to all CACR-1E units prior to dispatch:

Power Stage Verification: Full load current test at rated output to confirm IGBT/transistor module integrity and thermal performance within specification.
Analog Loop Calibration: Velocity loop and current loop gain verification using calibrated signal sources; offset null adjustment where required.
Encoder Interface Test: A/B/Z incremental encoder signal integrity check at rated cable length to confirm differential line driver output levels.
Regenerative Circuit Check: Dynamic braking resistor circuit continuity and discharge timing verification.
Capacitor ESR Measurement: DC bus electrolytic capacitor equivalent series resistance measurement to identify age-degraded capacitors prior to shipment.
Isolation Test: Hi-pot test between power terminals and chassis ground per IEC 61800-5-1 requirements.
Functional Run Test: Motor-coupled run test at no-load and partial load to confirm stable velocity regulation and absence of oscillation or fault codes.