Allen-Bradley 1336F-BRF20-AA-EN-HCS2 Migration-Ready VFD

Overview

Allen-Bradley 1336F-BRF20-AA-EN-HCS2 Migration-Ready VFD for Legacy Control Systems

The Allen-Bradley 1336F-BRF20-AA-EN-HCS2 is a 20HP variable frequency drive from the 1336 FORCE series, engineered for demanding industrial environments where legacy system continuity is critical. As original 1336 FORCE drives approach end-of-life and spare parts become increasingly scarce, this unit serves as a verified migration-ready replacement for facilities managing aging automation infrastructure. Whether you are executing a planned retrofit of a legacy control cabinet, recovering from an unplanned drive failure, or extending the operational life of a production line built around Rockwell Automation architecture, the 1336F-BRF20-AA-EN-HCS2 provides a technically sound, field-proven path forward.

This drive is equipped with an EtherNet/IP communication interface, enabling direct integration into existing ControlLogix or CompactLogix control platforms without requiring a gateway or protocol converter. The HCS2 frame designation confirms the physical enclosure dimensions, mounting footprint, and heat dissipation characteristics that engineers must verify before committing to a panel retrofit. For facilities replacing an earlier 1336 FORCE variant or migrating from a 1336 PLUS or 1336 IMPACT drive, the terminal block layout, control wiring pinout, and parameter structure require careful cross-referencing against the original drive’s configuration backup before commissioning.

Retrofit planning for this unit should begin with a review of the existing power supply capacity. The 1336F-BRF20-AA-EN-HCS2 operates on a three-phase input and draws specific inrush current during startup; if the control cabinet houses a 1606-XLP power supply or similar 24VDC auxiliary supply feeding the control logic, its capacity must be confirmed against the total panel load after the new drive is installed. Likewise, if the system includes a 1492-IFM interface module for terminal wiring, the existing field wiring can often be reused, reducing rewiring time and minimizing the risk of introducing wiring errors during the changeover.

For sites running a PanelView Plus HMI, the drive replacement may require updating the RSLogix 5000 or Studio 5000 program to reflect any changes in drive tag addresses or Add-On Instructions. If the original drive was configured with DriveExecutive or DriveExplorer software, parameter files should be exported and archived before the old unit is removed. The replacement drive’s parameters can then be loaded via the same toolchain, significantly reducing commissioning time and protecting the original control logic from unintended modification.

Communication link integrity is another critical checkpoint. If the 1336F-BRF20-AA-EN-HCS2 is connected to a DeviceNet or ControlNet segment in addition to EtherNet/IP, the network node address and baud rate settings must be re-entered manually or restored from a saved configuration. In multi-drive systems where a 1336-GM1 or similar gateway module bridges legacy serial communication to the main control network, the gateway configuration should be verified after the drive swap to confirm that the new unit is correctly recognized on the network.

Physical installation requires confirmation that the replacement drive fits within the existing enclosure cutout and that the mounting rail or back-panel dimensions match the HCS2 frame specification. Adequate clearance above and below the drive must be maintained for airflow, particularly in high-ambient-temperature environments. If the original installation used a 1321-3R line reactor for harmonic mitigation or a 1321-M02 motor protection filter, these accessories are compatible with the replacement drive and should be retained to protect both the drive and the connected motor.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful retrofit of the 1336F-BRF20-AA-EN-HCS2 into an existing automation system depends on methodical pre-installation planning. Begin by auditing the control cabinet for available space, verifying that the HCS2 frame dimensions are compatible with the existing enclosure layout. If the cabinet also houses a 1756-L71 ControlLogix processor or a 1769-L33ER CompactLogix controller, confirm that the EtherNet/IP network switch has a free port and that the IP address scheme is documented before the new drive is connected.

Terminal wiring is one of the most time-sensitive steps in any drive replacement. The 1336F-BRF20-AA-EN-HCS2 uses a standard control terminal block layout consistent with the 1336 FORCE series, but engineers should cross-reference the original wiring diagram against the replacement unit’s terminal designations before transferring any field wiring. If the existing installation uses a 1492-IFM interface module to break out control signals, the module’s wiring can typically be preserved, reducing the risk of miswiring during the changeover.

For systems that include a 1336-GM1 gateway or a 1203-USB programming cable for drive configuration, these tools remain compatible with the replacement drive and should be on hand during commissioning. If the site uses a 20-HIM-A6 Human Interface Module for local parameter access, it can be mounted on the new drive to provide on-panel visibility during startup and fault diagnostics. In multi-drive installations, the 1336F-BRF20-AA-EN-HCS2 can be integrated alongside existing 1336 FORCE units on the same EtherNet/IP segment, allowing phased replacement without disrupting the rest of the drive network.

Downtime Control During System Migration

Minimizing production downtime during a drive replacement requires a structured approach that protects the original program logic, preserves field wiring integrity, and validates the replacement unit before the line is restarted. The recommended sequence begins with a full parameter export from the original drive using DriveExecutive or DriveExplorer, followed by a backup of the PLC program from the ControlLogix or CompactLogix controller using Studio 5000. These backups ensure that if any issue arises during commissioning, the system can be restored to its previous state without extended troubleshooting.

Once the replacement 1336F-BRF20-AA-EN-HCS2 is physically installed and wired, parameters should be loaded from the saved configuration file before power is applied to the motor. This approach eliminates the need for manual parameter entry and reduces the risk of commissioning errors caused by incorrect acceleration ramps, current limits, or speed references. After parameter upload, a no-load test should be performed to verify drive response before the motor is reconnected to the mechanical load.

For facilities with strict change management requirements, the replacement drive can be pre-configured and tested on a bench setup before the scheduled maintenance window, further compressing the on-site installation time. All units supplied by KNMKS undergo a full functional test prior to dispatch, providing an additional layer of confidence that the drive will perform correctly from the first power-up. The support terms confirmed by quotation cover the replacement unit for the full duration of the initial post-installation period, protecting the facility against early-life failures and reducing the financial risk of the retrofit investment.

Retrofit Support FAQ

Q: Is the 1336F-BRF20-AA-EN-HCS2 a direct drop-in replacement for other 1336 FORCE variants?
A: It is a close replacement for other 1336 FORCE 20HP units with the HCS2 frame, but engineers must verify the communication option card (EN = EtherNet/IP), input voltage range, and control terminal wiring against the original unit’s nameplate and wiring diagram before installation. Parameter files from the original drive can be loaded into the replacement unit to preserve the original configuration.

Q: Can the original field wiring be reused when replacing the drive?
A: In most cases, yes. The 1336 FORCE series uses a consistent terminal block layout across the HCS2 frame, and field wiring connected via a 1492-IFM interface module can typically be transferred without modification. Always verify terminal designations against the replacement unit’s wiring diagram before energizing the control circuit.

Q: What testing is performed before the unit is shipped?
A: Every unit supplied by KNMKS undergoes a full functional test prior to dispatch, including power-up verification, communication interface check, and basic parameter validation. Units are shipped with documentation confirming test completion. A support terms confirmed by quotation is included with every unit.

Q: How quickly can the unit be delivered, and is stock available?
A: KNMKS maintains inventory of the 1336F-BRF20-AA-EN-HCS2 to support urgent replacement requirements. Lead times and current stock levels can be confirmed by contacting our sales team directly. Express shipping options are available for critical production recovery situations.

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Product Identification

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Allen-Bradley
Allen-Bradley

Model / Series

1336F-BRF20-AA-EN-HCS2

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Variable Frequency Drives

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Available on request after model and quantity confirmation

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AC drives, VFDs and accessories

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Motor control, energy saving and spares

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