Allen-Bradley 1336-L6/B Original Industrial Spare 1336 PLUS Compatible

Product Overview

Allen-Bradley 1336-L6/B Original Industrial Spare: System Stability & Maintenance Value

The Allen-Bradley 1336-L6/B is an original control interface board engineered for the 1336 PLUS series AC drive — one of Rockwell Automation’s most widely deployed variable frequency drive platforms in industrial manufacturing, process control, and material handling environments. For maintenance engineers and plant managers operating legacy 1336 PLUS installations, sourcing a verified original spare like the 1336-L6/B is a direct investment in system uptime, operational continuity, and long-term cost control.

In high-demand production environments, an unplanned AC drive failure can cascade into hours or days of costly downtime. The 1336-L6/B control interface board governs the critical communication and control signal pathway between the drive’s main power section and the operator interface or external PLC/DCS control system. When this board fails — due to electrical transients, thermal stress, or component aging — the entire drive becomes inoperable. Having a tested, ready-to-install 1336-L6/B on the shelf is the single most effective way to reduce mean time to repair (MTTR) for 1336 PLUS drive faults.

Critical Technical Specs

Preventive Maintenance Strategy for 1336 PLUS Drive Systems

Replacing the 1336-L6/B control interface board is rarely an isolated event. In a well-structured preventive maintenance program, a drive board replacement is the ideal trigger point for a comprehensive inspection of the entire drive cabinet and associated control circuit. Experienced maintenance teams use this opportunity to audit the full electrical environment surrounding the 1336 PLUS drive.

Begin with the DC bus capacitor bank — capacitor degradation is one of the leading causes of drive instability and is frequently found alongside interface board failures in aging 1336 PLUS units. Simultaneously, inspect the 1336-MOD-L6 operator interface module and its ribbon cable connections, as intermittent contact at this interface is a common misdiagnosis that leads to unnecessary board replacements. Verify the integrity of the 1336-PB power board and gate driver section, since control board faults are sometimes symptomatic of upstream power supply irregularities.

At the cabinet level, check the 1492-SP series supplementary protectors and associated fuse modules protecting the drive’s control power circuit — a blown control fuse can mimic a board failure and should always be ruled out first. Inspect all 1492-IFM interface modules and terminal blocks on the I/O wiring side; loose or corroded terminals introduce signal noise that accelerates interface board wear. If the drive communicates over a network, audit the 1336-GM6 or 1336-BDB DeviceNet / DH+ communication module for firmware currency and connector condition.

For drives integrated into a broader Rockwell Automation control architecture, this is also the right moment to verify the health of the associated 1756-L series ControlLogix or 1769-L CompactLogix controller handling the drive’s speed reference and fault feedback. Check the 1756-IB16 or 1769-IQ16 digital input modules receiving the drive’s run/fault status signals, and confirm that any 1492-CABLE series pre-wired cables connecting the drive to the I/O system are free of insulation damage. Where analog speed references are used, inspect the 1756-IF8 or 1769-IF4 analog input modules for calibration drift. Finally, review the condition of the 22-HIM-A3 or 20-HIM-C6S HMI operator panel if one is mounted on the drive cabinet door — panel faults are frequently logged alongside drive interface errors and can indicate a shared power supply issue.

A disciplined, system-level inspection during a 1336-L6/B replacement typically prevents two to three additional unplanned failures within the following 12-month period — a measurable return on a structured spare parts and maintenance investment.

Strategic Replacement Solutions

The Allen-Bradley 1336 PLUS platform has been in service at industrial facilities worldwide for over two decades. While Rockwell Automation has transitioned its current drive portfolio to the PowerFlex 400, 525, and 755 series, a significant installed base of 1336 PLUS drives remains in active production service — particularly in applications where the cost and complexity of a full drive replacement and PLC reprogramming cannot be justified in the near term.

The 1336-L6/B enables a direct, drop-in board-level repair that restores full drive functionality without requiring changes to the existing control program, wiring, or operator interface configuration. This is a critical advantage in facilities where the 1336 PLUS drive is deeply integrated into a legacy PLC-5 or SLC 500 control system, where a full drive swap would require significant engineering effort and production downtime for system re-commissioning.

From a total cost of ownership perspective, a verified original 1336-L6/B spare — tested, warranted, and ready to ship — represents a fraction of the cost of a new PowerFlex drive, associated engineering hours, and the production loss incurred during a full system migration. For facilities managing 5, 10, or 20+ 1336 PLUS drives, maintaining a small buffer stock of 1336-L6/B boards and other high-wear components is a proven strategy for extending system life by 5–10 years while capital expenditure planning for a phased modernization program proceeds.

All units supplied by TOPNLMS are sourced from verified industrial channels, individually tested for electrical functionality prior to shipment, and covered by a 12-month warranty. Expedited shipping via DHL, FedEx, or UPS is available to minimize lead time in emergency breakdown situations.

Support FAQ

Q1: Is the 1336-L6/B compatible with both 1336 PLUS and 1336 PLUS II drives?
The 1336-L6/B is primarily specified for the 1336 PLUS series. Compatibility with 1336 PLUS II variants depends on the drive’s firmware revision and hardware series. We recommend confirming your drive’s catalog number and series letter before ordering. Our technical team can assist with compatibility verification.

Q2: How is each unit tested before shipment?
Every 1336-L6/B board is individually inspected and electrically tested prior to dispatch. Units are verified for component integrity, connector condition, and basic functional parameters. A test report is available upon request for critical applications.

Q3: What does the 12-month warranty cover?
The 12-month warranty covers manufacturing defects and functional failures under normal industrial operating conditions from the date of shipment. It does not cover damage resulting from incorrect installation, electrical overstress, or environmental conditions outside the specified operating range. Warranty claims are processed with priority to minimize your downtime.

Q4: Can I stock multiple units for a multi-drive facility?
Yes — volume pricing is available for facilities maintaining buffer stock of 1336-L6/B boards and associated 1336 PLUS spare components. Stocking 2–3 units per facility is a common practice among maintenance teams managing 10 or more 1336 PLUS drives. Contact us to discuss a spare parts inventory plan tailored to your site’s drive population.