AB 1336F-MCB-SP2L 164989 Migration-Ready MCB for VFDs

Overview

AB 1336F-MCB-SP2L 164989 Migration-Ready MCB for Legacy VFD Systems

The Allen-Bradley 1336F-MCB-SP2L (Catalog No. 164989) is a migration-ready main control board (MCB) engineered for the 1336 PLUS II series of AC variable frequency drives. As legacy 1336 PLUS II installations approach end-of-service milestones, this MCB serves as the critical interface between the drive’s power section and its control logic — making it the first component to evaluate during any retrofit, spare-parts audit, or unplanned downtime recovery.

For facilities still operating 1336 PLUS II drives in pump stations, conveyor lines, HVAC systems, compressor skids, and material handling equipment, sourcing a verified replacement 1336F-MCB-SP2L is often the fastest path to restoring production without committing to a full drive replacement. This board carries part number 164989 and is compatible with the standard 1336 PLUS II frame configurations that accept the SP2L MCB variant.

Before installation, engineers should confirm the following: the drive’s firmware revision, the existing MCB revision stamped on the board label, the SCANport communication adapter configuration (if a 1336-GM1 or 1336-MOD-C2 gateway is in use), and whether any external 1336-BRF brake resistor modules or 1336-PB power bridge assemblies are wired to the existing control harness. Mismatched firmware between the MCB and the drive’s gate driver board can cause fault codes F002 or F048 at startup — a pre-commissioning firmware check eliminates this risk.

Terminal wiring on the 1336F-MCB-SP2L follows the standard 1336 PLUS II TB1 and TB3 layout. Technicians migrating from a failed board should photograph or document all existing wiring before removal, paying particular attention to the analog reference input (terminals 1–3), the digital input assignments (terminals 11–16), and the relay output wiring (terminals 17–22). If the original drive was configured with a 1336-L6E or 1336-L11E remote I/O adapter, the adapter’s DIP switch settings and node address must be re-entered after the MCB swap, as these parameters are stored on the adapter — not the MCB itself.

Backplane and rack considerations are not applicable to the 1336 PLUS II, which is a standalone drive platform. However, if the drive is integrated into a control cabinet alongside a 1747-L553 SLC 5/05 controller or a 1769-L33ER CompactLogix processor communicating via DeviceNet or DH-485, the drive’s node address and baud rate settings stored in EEPROM on the MCB must be re-programmed using DriveExplorer or DriveExecutive software after board replacement. Failure to restore these parameters will result in communication loss between the PLC and the drive.

For sites where the 1336 PLUS II is nearing obsolescence and a full migration to a PowerFlex 400 or PowerFlex 525 is planned, the 1336F-MCB-SP2L replacement provides a cost-effective bridge strategy — restoring the existing drive to full operation while the migration project is scoped, budgeted, and scheduled. This approach minimizes unplanned downtime and allows the engineering team to execute the platform migration on a controlled timeline rather than under emergency conditions.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful 1336F-MCB-SP2L retrofit begins well before the board arrives on site. The planning phase should include a full audit of the drive’s parameter file — exported via DriveExplorer from the existing MCB if it is still partially functional — so that all application-specific settings (acceleration/deceleration ramps, current limits, PID setpoints, and fault response configurations) can be restored immediately after the new board is installed.

If the control cabinet houses a 1336-PB power bridge module or a 1336-BRF dynamic braking resistor assembly, verify that the wiring harness connectors between these components and the MCB are undamaged before installation. Corroded or intermittently connected harness pins are a common root cause of recurring MCB failures in high-humidity or high-vibration environments.

Sites using a 1336-L6E or 1336-L11E remote I/O scanner to integrate the drive into a legacy PLC-5 or SLC 500 control system should note that the scanner’s configuration — including rack number, starting slot, and I/O image size — is stored on the scanner adapter, not the MCB. However, the drive’s internal node address and the SCANport polling rate must be re-confirmed after the MCB swap to ensure the scanner re-establishes communication without requiring a PLC program modification.

For cabinets that also contain a 1336-GM1 gateway module bridging the drive to a ControlNet or EtherNet/IP network, the gateway’s EDS file and network node configuration should be backed up before any board work begins. If the HMI — typically a PanelView 550 or PanelView 600 connected via DH-485 — displays drive status screens, verify that the HMI tag database references the correct drive node address after the MCB replacement. A node address mismatch will cause the HMI to display communication error banners without affecting actual drive operation, but it will prevent operators from monitoring drive status from the panel.

Where the retrofit is part of a broader control system modernization — for example, migrating from a PLC-5 platform to a 1769-L33ER CompactLogix with EtherNet/IP — the 1336F-MCB-SP2L replacement extends the operational life of the existing drive long enough to complete the controller migration without forcing a simultaneous drive replacement. This staged approach reduces project risk and allows each subsystem to be validated independently.

Downtime Control During System Migration

Unplanned drive failures in continuous-process environments — water treatment, food processing, chemical dosing, or HVAC — can result in hours or days of lost production if replacement parts are not available locally. Stocking a verified 1336F-MCB-SP2L as a critical spare eliminates the lead-time risk associated with sourcing obsolete Allen-Bradley components through standard distribution channels.

For planned maintenance windows, the MCB swap procedure on a 1336 PLUS II typically requires 45–90 minutes for a technician familiar with the platform: isolate and lock out the drive, discharge the DC bus (minimum 5-minute wait after power removal), document all wiring, remove the old MCB, install the replacement, restore wiring, power up, and restore parameters via DriveExplorer. If the parameter file was pre-exported, the restoration step takes under 10 minutes.

To protect original program logic during the migration, ensure that the PLC controlling the drive — whether a 1747-L553 SLC 5/05 or a 1769-L33ER CompactLogix — is placed in Remote Program mode before the drive is de-energized. This prevents the PLC from generating fault outputs or triggering safety interlocks due to loss of drive feedback during the swap. After the new MCB is installed and communication is restored, return the PLC to Remote Run mode and verify all drive status bits in the PLC data table before resuming production.

Pre-shipment functional testing of each 1336F-MCB-SP2L unit — including power-up verification, I/O continuity checks, and SCANport communication validation — ensures that the replacement board is confirmed operational before it reaches the field, eliminating the risk of installing a second defective component during an already time-critical repair.

Retrofit Support FAQ

Q1: Is the 1336F-MCB-SP2L a direct drop-in replacement for all 1336 PLUS II drives?
The 1336F-MCB-SP2L (164989) is compatible with 1336 PLUS II drives that use the SP2L MCB variant. Confirm the MCB variant designation on the existing board label before ordering. Drives using SP1 or SP3 MCB variants require a different catalog number.

Q2: Do I need to re-program the drive after replacing the MCB?
Yes. Drive parameters are stored on the MCB. After replacement, all application parameters must be restored — either from a pre-exported parameter file using DriveExplorer or DriveExecutive, or by manually re-entering values from a printed parameter record. Node address, baud rate, and SCANport adapter settings must also be re-confirmed.

Q3: What is the support terms coverage and how is it handled?
All units carry a support terms confirmed by quotation covering manufacturing defects and functional failure under normal operating conditions. Support requests are handled directly — contact admin@knmks.com with the order number and a description of the fault. Replacement or refund is processed after fault verification.

Q4: Is pre-shipment testing performed on each unit?
Yes. Each 1336F-MCB-SP2L undergoes pre-shipment functional testing including power-up verification, I/O continuity, and SCANport communication checks. Units are shipped in ESD-safe packaging with a test record. Stock is available for immediate dispatch with global express shipping options.

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Product Identification

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Allen-Bradley
Allen-Bradley

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1336F-MCB-SP2L 164989

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Variable Frequency Drives

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AC drives, VFDs and accessories

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