YASKAWA CACR-PR01AD4NR Replacement for Sigma-I Series

Product Overview

YASKAWA CACR-PR01AD4NR Replacement for Sigma-I Series: Smooth Transition, Full Compatibility

The YASKAWA CACR-PR01AD4NR is a 100 W AC servo amplifier from the Sigma-I drive platform — one of YASKAWA’s most widely deployed servo families in precision motion control across Asia, Europe, and the Americas. As Sigma-I generation hardware approaches end-of-life and OEM spare parts become increasingly scarce, maintenance engineers and procurement teams are actively sourcing verified replacement units to sustain production continuity without committing to a full system redesign.

At TOPNLMS, we stock the CACR-PR01AD4NR as a direct, wiring-compatible replacement for aging Sigma-I servo systems. Each unit is individually tested prior to shipment, backed by a 12-month warranty, and dispatched from our Xiamen warehouse with full documentation support. Whether you are replacing a failed amplifier on a CNC machining center, a packaging line, or a semiconductor handling system, this unit restores your axis to full operation with minimal downtime.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful servo amplifier replacement rarely involves the drive alone. The CACR-PR01AD4NR sits within a broader motion control architecture, and understanding the surrounding components is essential for a smooth retrofit.

The most common motor pairing is the SGMAH-01A1A41 — a 100 W, 3,000 rpm servo motor with an incremental encoder that connects directly to the CN2 port of the CACR-PR01AD4NR without any wiring modification. If the existing motor remains functional, the amplifier can be swapped independently. If both units require replacement, sourcing the motor and amplifier together eliminates encoder compatibility variables and simplifies tuning.

For systems using a YASKAWA JEPMC-W6022 MECHATROLINK-I communication cable, the CN3 interface on the CACR-PR01AD4NR maintains backward compatibility, allowing the motion controller — typically a YASKAWA MP920 or MP940 machine controller — to retain its existing motion program without modification. This is a critical advantage for facilities where reprogramming requires certified personnel or extended downtime windows.

In multi-axis control cabinets, the CACR-PR01AD4NR is frequently installed alongside other Sigma-I amplifiers such as the CACR-PR02AD4NR (200 W) and CACR-PR05AD4NR (500 W), sharing a common 24 VDC control power rail supplied by a YASKAWA JZRCR-NPP01B or equivalent DIN-rail power supply module. The physical footprint of the CACR-PR01AD4NR is consistent across the Sigma-I family, so no cabinet modification is required when replacing a like-for-like unit.

For facilities planning a phased migration from Sigma-I to Sigma-II or Sigma-5, the CACR-PR01AD4NR serves as a cost-effective interim replacement while the broader upgrade is planned. The SGDH-01AE (Sigma-II, 100 W) and SGDV-R70A01A (Sigma-5, 100 W) are the recommended upgrade paths for new installations, but the CACR-PR01AD4NR provides a proven bridge solution that avoids immediate capital expenditure on a full drive replacement program.

Where signal isolation is required between the host controller and the servo amplifier — particularly in environments with high electromagnetic interference from variable frequency drives, welding equipment, or high-current bus bars — a DIN-rail signal isolator can be inserted on the pulse train command lines (CN1) without affecting amplifier performance or requiring parameter changes. Parameter backup and restoration can be performed using the YASKAWA Digital Operator JUSP-OP05A-1 or the SigmaWin+ PC software tool, both of which are compatible with the CACR-PR01AD4NR parameter set.

Retrofit Guidance FAQ

Q1: Can I replace my existing Sigma-I amplifier with the CACR-PR01AD4NR without rewiring?
In most cases, yes. The CACR-PR01AD4NR uses the same CN1 (50-pin I/O), CN2 (encoder), and CN3 (serial communication) connector layout as other Sigma-I amplifiers of the same power class. If your existing wiring harness was built to the standard Sigma-I pinout, no rewiring is required. Verify the CN1 wiring against the CACR-PR01AD4NR user manual before powering up.

Q2: Will my existing motion program run without modification after the swap?
Yes, provided the host controller communicates via pulse train or MECHATROLINK-I. The CACR-PR01AD4NR accepts the same command formats as other Sigma-I amplifiers. Pn parameters may need to be re-entered if the original amplifier’s parameters were not backed up. Use the JUSP-OP05A-1 Digital Operator or SigmaWin+ to transfer parameters before decommissioning the old unit.

Q3: Is the CACR-PR01AD4NR compatible with MECHATROLINK-I networks?
The base unit supports RS-422 serial communication. MECHATROLINK-I compatibility depends on the option card fitted. Please confirm the option card configuration when ordering if MECHATROLINK-I is required. For MECHATROLINK-II networks, the Sigma-II or Sigma-5 series is the recommended platform.

Q4: What if the physical installation space in my cabinet differs from the original amplifier?
The CACR-PR01AD4NR has a standard Sigma-I form factor. If your cabinet was originally designed for a Sigma-I unit of the same power class, the replacement fits without modification. For cabinets housing mixed-generation drives, contact our technical team with your cabinet layout and we will advise on mounting options.

Q5: How do I handle communication protocol differences during the transition?
The CACR-PR01AD4NR communicates via RS-422 using the standard Sigma-I serial protocol. If your system uses a higher-level network such as MECHATROLINK-I, verify the option card is present. No protocol conversion is required for RS-422 pulse-train systems — the transition is transparent to the host controller.

Warranty Assurance

Every CACR-PR01AD4NR shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each unit undergoes a functional test protocol including power-on verification, encoder signal integrity check, I/O continuity test, and communication port validation. Units that do not pass all test criteria are quarantined and not shipped.

In the event of a warranty claim, TOPNLMS provides a replacement unit or full refund within the warranty period. After-sales response time is within 24 hours for standard inquiries and within 4 hours for urgent production-down situations. We maintain buffer stock of the CACR-PR01AD4NR and related Sigma-I components to support rapid replacement without lead-time delays.

For procurement teams requiring documentation, we provide test reports, packing lists, commercial invoices, and certificates of origin. Long-term supply agreements are available for facilities with recurring spare parts requirements. To confirm availability, request a quotation, or discuss technical compatibility for your specific application, contact our team directly.