Allen-Bradley 1326AB-B720E-S2L Maintenance Spare Part

Overview

Allen-Bradley 1326AB-B720E-S2L Maintenance Spare Part: Factory-Proven AC Servo Motor for Continuous Uptime

The Allen-Bradley 1326AB-B720E-S2L is a high-performance AC servo motor from Rockwell Automation’s 1326AB Series, engineered for demanding industrial motion control applications. As a maintenance-proven spare part, this unit is a critical component in production lines, packaging machinery, CNC systems, and automated assembly cells where servo precision and continuous uptime are non-negotiable. Whether you are managing a scheduled annual overhaul, responding to an unplanned motor failure, or building a strategic spare parts inventory, the 1326AB-B720E-S2L delivers the reliability and compatibility your facility demands.

Sourced as an original spare, each unit undergoes functional verification prior to shipment. With a support terms confirmed by quotation and documented test results, maintenance engineers and procurement teams can confidently integrate this motor into existing Kinetix drive systems without compatibility risk. Fast dispatch and long-term supply availability make this an ideal candidate for both emergency replacement and planned inventory stocking.

Spare Maintenance Table

Maintenance Planning for Continuous Operation

When replacing the 1326AB-B720E-S2L in a live production environment, a structured maintenance approach prevents secondary failures and reduces total downtime. Maintenance engineers should treat this motor replacement as an opportunity to inspect the entire servo axis and associated control cabinet components.

Begin with the servo drive paired to this motor — typically a Kinetix 1394 or 2098 series drive. Verify that the drive firmware is current and that axis parameters (tuning gains, encoder resolution, motor model file) are backed up before disconnecting the motor. A failed motor can sometimes mask underlying drive faults; confirm the drive’s output stage is healthy before commissioning the replacement unit.

Inspect the motor power cable and encoder feedback cable (1326AB-series compatible shielded cables) for insulation damage, connector pin corrosion, and shield continuity. Degraded cables are a leading cause of premature servo motor failure and encoder signal errors. Replace any cable showing abrasion, heat damage, or connector wear at the same maintenance interval.

Check the servo axis fusing and circuit protection within the control cabinet. Blown fuses or tripped thermal overloads upstream of the drive may indicate an overcurrent event that contributed to the motor fault. Verify that branch circuit protection ratings are appropriate for the 1326AB-B720E-S2L’s rated current draw.

For systems using a 1756 ControlLogix or 1769 CompactLogix PLC to coordinate motion, confirm that the motion task and axis configuration in Studio 5000 Logix Designer reflect the replacement motor’s parameters. If the motor model file differs from the previous unit, update the axis configuration and perform a drive autotune before returning the axis to automatic production mode.

Where the control cabinet includes I/O modules, terminal blocks, or signal isolators on the servo enable or fault interlock circuits, inspect wiring integrity and terminal torque. Loose terminals on 24 VDC enable signals are a common source of intermittent servo faults that are misdiagnosed as motor failures. A thorough cabinet inspection during the motor replacement window maximizes the value of the maintenance event and reduces the likelihood of a repeat callout.

For facilities managing aging 1326AB-series installations, consider stocking a 1326AB-series resolver or encoder feedback module alongside this motor spare. Extended lead times on legacy feedback accessories can extend downtime beyond the motor replacement itself. A pre-positioned spare parts kit — motor, cables, fuses, and drive backup — supports a sub-four-hour axis recovery target on critical production lines.

Site Replacement Workflow

Step 1 — Pre-Replacement Preparation: Back up the Kinetix drive parameters and PLC motion configuration. Document current axis tuning values. Confirm the replacement 1326AB-B720E-S2L matches the frame size, feedback type (S2L encoder), and shaft configuration of the installed unit. Verify mechanical coupling compatibility.

Step 2 — Safe Isolation: Follow site LOTO (Lockout/Tagout) procedures. De-energize the servo drive and confirm bus voltage has discharged to safe levels before disconnecting motor power and encoder cables. Label all connectors before removal.

Step 3 — Motor Removal and Inspection: Remove the faulty motor and inspect the motor mount, coupling, and load-side mechanical interface for wear or damage. Clean the mounting flange. Inspect the motor power and encoder connectors for pin damage or contamination.

Step 4 — Replacement Installation: Mount the 1326AB-B720E-S2L, reconnect motor power cable and encoder feedback cable per the original wiring diagram. Verify shield grounding at the drive end. Torque all terminal connections to specification.

Step 5 — Drive Commissioning: Restore drive parameters from backup. If a new motor model file is required, update the axis configuration in Studio 5000. Perform drive autotune in a safe, unloaded condition. Verify encoder feedback signal quality before enabling the axis under load.

Step 6 — Functional Verification: Run the axis through its full motion profile at reduced speed, then at full production speed. Monitor drive current, position error, and temperature. Confirm no active faults before returning the line to full production. Document the replacement in the site maintenance log.

This workflow is applicable to both emergency breakdown replacements and planned preventive maintenance swaps, and supports the goal of minimizing mean time to repair (MTTR) on servo-driven production axes.

Spare Parts Support FAQ

Q1: Is the 1326AB-B720E-S2L compatible with all Kinetix servo drives?
The 1326AB Series motors are designed for use with Rockwell Automation’s Kinetix family of servo drives, including the 1394 and 2098 series. Compatibility depends on the drive’s motor model library and firmware version. Always verify the motor model file is available in your drive’s firmware before installation. Contact our technical team with your drive catalog number for a compatibility confirmation prior to ordering.

Q2: What does the S2L suffix indicate, and does it affect interchangeability?
The S2L suffix designates the feedback and inertia configuration of the motor — specifically a standard encoder with low inertia rotor. This suffix is critical for interchangeability: a replacement motor must match the original suffix to ensure correct encoder signal compatibility with the paired drive. Substituting a different feedback variant (e.g., resolver-based) requires drive reconfiguration and is not recommended for emergency replacements without engineering review.

Q3: How is the unit tested before shipment, and what does the support terms confirmed by quotation cover?
Each 1326AB-B720E-S2L unit is functionally tested prior to dispatch, including encoder signal verification and insulation resistance checks. The support terms confirmed by quotation cover defects in materials and workmanship under normal industrial operating conditions. It does not cover damage resulting from incorrect installation, overvoltage events, or mechanical overload. Test documentation is available upon request for quality-assurance purposes.

Q4: Can you support long-term supply for legacy 1326AB-series motors?
Yes. We maintain ongoing sourcing for 1326AB-series spare parts to support facilities operating legacy Rockwell Automation motion systems. For sites with multiple servo axes using 1326AB motors, we recommend establishing a blanket spare parts agreement to ensure priority allocation and stable pricing. Contact our sales team to discuss volume requirements, lead times, and consignment stocking options tailored to your maintenance schedule.

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Product Identification

Brand / Ecosystem

Allen-Bradley
Allen-Bradley

Model / Series

1326AB-B720E-S2L
Assorted Series

Product Family

PLCs & Controllers

Availability Status

Available on request after model and quantity confirmation

Inquiry Type

B2B RFQ, replacement inquiry and project spare-part request

Pre-Quote Check

Exact SKU, brand, series, quantity, nameplate photos and destination country are checked before quotation

Specification & Inquiry Focus

Control platform

PLC, PAC and modular controllers

Common needs

CPU, rack, power and I/O expansion

Project support

Replacement, cabinet build and maintenance

Inquiry Support

• Model cross-checking before quotation
• CPU, power, rack and expansion module matching
• Support for replacement and project inquiry

What to Send Us

• Brand and exact model number: Allen-Bradley 1326AB-B720E-S2L
• Quantity and required delivery time
• Application, replacement requirement or nameplate photo
• Destination country and shipping preference