Allen-Bradley 1336S-MCB-SP1B | B-H Frame Drive Board

Description

Key Technical Specifications

Rockwell Automation’s spare-parts catalog explicitly identifies 1336S-MCB-SP1B as the main control PCB for 1336S B-H frames. The same catalog distinguishes it from 1336S-MCB-SP2B, which is intended for A1-A4 frames.

Application Scenarios & Pain Points

With a legacy 1336S drive, the main control PCB is not something to substitute casually. The drive may power up, show a display, and still fail to run because the control board does not match the expected hardware or firmware configuration.

Typical Applications

• Industrial AC Drives: Used as the main control electronics for 1336S adjustable-frequency drives operating motors in industrial machinery.
• B-H Frame Drive Maintenance: Specifically applicable to the larger 1336S frame range identified by Rockwell’s spare-parts documentation.
• Legacy Production Equipment: Useful when a plant still has 1336S drives integrated into conveyors, pumps, fans, machine tools, process equipment, or other motor-control systems.
• Emergency Drive Repair: A tested spare can reduce downtime when the existing main control PCB has failed but the drive’s power components remain serviceable.

Field Case:
When a 1336S suddenly loses run control, do not immediately condemn the main board. Check the control-power supply, keypad/display behavior, fault history, wiring, and external enable/reference signals first. If those checks are normal and the drive’s internal control functions remain abnormal, the MCB becomes a reasonable suspect.

1336S-MCB-SP1B

Related Products

• Allen-Bradley 1336S-MCB-SP2B — Main control PCB for 1336S A1-A4 frame drives. It belongs to the same 1336S control-board family but is not the correct frame configuration for B-H drives.
• Allen-Bradley 1336S-MCB-SP1 — Earlier/general 1336S main control board designation associated with B-H frame drives. Verify the complete suffix and board revision before treating it as equivalent to SP1B.
• Allen-Bradley 1336S-MCB-SP1A — Related B-H frame main-control-board designation. It should be considered a revision-specific comparison rather than an automatic replacement.
• Allen-Bradley 1336S-MCB-SP1C — Another related B-H frame control-board designation. The suffix can identify a different revision/configuration, so compare the installed board and drive documentation before substitution.
• Allen-Bradley 1336F-MCB-SP1M — Main control board for 1336F drives, B-G frames. It belongs to the 1336 family but is not a substitute for the 1336S board. Rockwell’s parts documentation lists it separately.
• Allen-Bradley 1336T-MCB-SP34B — Main control board for 1336T Series B drives. It is another legacy 1336-family control board with a different control architecture.
• Allen-Bradley 1336S-EN5 — Language module associated with 1336S drives. It is complementary drive electronics rather than a replacement for the main control PCB.
• Allen-Bradley 1336-SN-SP Series — Inverter/drive snubber boards used within the 1336 family. These serve the power-section protection circuitry rather than the main control function.

The Engineer’s Guide: Field Pitfalls to Avoid

⚠️ Do Not Confuse SP1B With SP2B

This is a frame-size issue, not a cosmetic suffix difference. Rockwell’s documentation assigns SP1B to 1336S B-H frames and SP2B to A1-A4 frames.

How to avoid it: Read the drive’s complete catalog number and frame designation before ordering the PCB.

⚠️ Check Firmware and Configuration Hardware

The main control board is part of the drive’s control architecture. Swapping a board without checking the firmware/language/configuration hardware can produce unexpected startup or parameter behavior.

How to avoid it: Record the original drive’s firmware revision, language module, parameter configuration, and board revision before removing the old MCB.

⚠️ Do Not Diagnose a Board From a Single Fault Code

An MCB fault can look similar to a control-power, feedback, keypad, or external-enable problem.

How to avoid it: Follow the drive troubleshooting sequence and verify control power, fault history, I/O, reference signals, and communication before replacing the PCB. Once removed, inspect connectors and the board for heat damage, contamination, cracked solder joints, and oxidation.

Frequently Asked Questions (FAQ)

What is Allen-Bradley 1336S-MCB-SP1B?

It is the main control PCB for Allen-Bradley 1336S adjustable-frequency drives in B-H frame sizes. Rockwell’s spare-parts documentation identifies the exact part as “PCB, Main Control 1336S, Frames B-H.”

What frame sizes does 1336S-MCB-SP1B support?

The documented application is 1336S Frames B through H. For A1-A4 frame drives, Rockwell lists 1336S-MCB-SP2B instead.

This distinction should be checked before purchase because the boards are not interchangeable merely because both carry the 1336S-MCB designation.

Is 1336S-MCB- the same as 1336S-MCB-SP1?

They are closely related designations, but do not assume complete interchangeability. The exact suffix can identify a hardware revision or configuration.

Best practice: Match the complete part number printed on the original PCB and compare the drive’s series and firmware requirements.

Can I use this board in a 1336F or 1336T drive?

No—not as a general substitution. The 1336F and 1336T families use their own main-control-board assemblies. Rockwell’s parts documentation lists 1336F-MCB-SP1M and 1336T-MCB-SP34B separately from the 1336S-MCB-.

What should I verify when buying a refurbished 13?

Request:

• Actual board photographs
• Complete marking
• PCB revision
• Firmware/language module information
• Connector condition
• Evidence of control-power testing
• Drive communication/control testing
• Fault-free startup test where practical
• Warranty terms

A visual inspection alone is weak evidence for a drive control PCB. A meaningful test should verify control operation under appropriate drive-test conditions.

Is 13 still a current Allen-Bradley product?

The 1336S product family is legacy equipment, and current distribution records identify 13 as discontinued.

That makes tested surplus and repaired/refurbished boards particularly relevant for plants maintaining existing 1336S installations.

What is the biggest replacement risk?

The biggest risk is incorrect frame or configuration matching. A board can have the correct 1336S family designation while still being wrong for the installed frame or revision.

Before purchasing, document the complete drive catalog number, frame size, original MCB part number, firmware/configuration information, and board revision. That information gives the supplier a much stronger basis for confirming compatibility than “1336S drive” alone.