Allen-Bradley 1336-PB-SP23C Migration-Ready Power Board Legacy AC

Overview

Allen-Bradley 1336-PB-SP23C Migration-Ready Power Board Legacy AC: Legacy System Migration and Compatible Upgrade

The Allen-Bradley 1336-PB-SP23C is a retrofit-ready power board designed for the 1336 PLUS series AC variable frequency drives. As legacy 1336 PLUS installations age beyond their original service life, procurement teams and maintenance engineers face increasing pressure to source verified replacement components that can restore drive functionality without requiring a full drive replacement or control system redesign. The 1336-PB-SP23C addresses this need directly: it is a form-fit-function compatible power board that slots into existing 1336 PLUS drive enclosures, preserving the original wiring harness, terminal block layout, and backplane interface without modification.

For facilities running legacy Allen-Bradley 1336 PLUS drives in conveyor systems, pump stations, HVAC air handlers, compressor controls, or process lines, the 1336-PB-SP23C provides a cost-effective path to extend drive service life by 5–10 years. Rather than commissioning a full drive swap to a PowerFlex 400 or PowerFlex 525 platform—which would require new parameter programming, HMI screen updates, DeviceNet or EtherNet/IP node reconfiguration, and potential PLC ladder logic revisions—replacing the power board alone allows the existing 1336 PLUS control board, gate driver board, and I/O wiring to remain in service.

Before installation, engineers should verify the drive’s DC bus voltage rating, input power phase configuration (3-phase 380–480 VAC typical), and the specific 1336 PLUS frame size to confirm dimensional compatibility. The 1336-PB-SP23C is rated for specific horsepower ranges within the 1336 PLUS family; cross-referencing the drive nameplate against the board’s rated current capacity is a mandatory pre-installation step. Terminal block torque specifications and wire gauge requirements should be confirmed against the original 1336 PLUS installation manual to avoid connection faults during commissioning.

In multi-drive control cabinets where several 1336 PLUS units share a common DC bus or are coordinated through a 1336 PLUS-compatible PLC rack—such as a SLC 5/04 or SLC 5/05 controller with 1746-series I/O modules—replacing the power board on one drive does not affect the communication link or the coordinated motion logic. The drive’s existing DPI (Drive Peripheral Interface) port and any connected 1201-HAB2 Human Interface Module remain fully functional after the board swap, eliminating the need for HMI screen reconfiguration or parameter re-entry.

For sites that have already partially migrated to newer Allen-Bradley platforms, the 1336-PB-SP23C serves as a bridge component: it keeps legacy drives operational while the broader migration to PowerFlex 755 or Kinetix servo platforms proceeds on a planned schedule, avoiding forced emergency replacements that compress engineering timelines and inflate project costs.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful 1336-PB-SP23C retrofit begins with a structured pre-work checklist. First, back up all drive parameters using DriveExplorer or DriveExecutive software connected via the 1784-U2DHP USB-to-DH+ adapter or a 1747-PIC SLC programming cable, depending on the existing communication infrastructure. Parameter backup protects acceleration/deceleration ramps, current limit settings, PID tuning values, and fault history logs that would otherwise be lost if the control board loses power during the swap.

Next, confirm the control cabinet’s available installation space. The 1336 PLUS power board occupies a defined form factor within the drive chassis; verify that no auxiliary components—such as a 1336-MOD-L2E LAN option module or a 1336-GM-1 ground fault module—are mounted in positions that would obstruct board removal or reinsertion. If the cabinet also houses a 1746-P4 power supply feeding a SLC 500 rack, ensure that the power supply’s output capacity is not shared with the drive’s control power circuit, as a momentary voltage dip during board swap could trigger a PLC fault and initiate an unplanned process shutdown.

Signal isolation should also be reviewed before the retrofit. If the 1336 PLUS drive receives 4–20 mA speed reference signals from a DCS analog output card or a 1771-OFE analog output module, verify that the signal isolator or barrier in the loop remains within calibration tolerance. A degraded isolator can introduce reference signal drift that manifests as unstable speed control after the board replacement, making it appear as a board defect when the root cause is upstream in the signal chain.

For sites using a 1336 PLUS with a 1336-L6E EtherNet/IP option card, confirm that the IP address assignment and EDS file registration in RSLinx Classic or Studio 5000 Logix Designer remain intact after the power board swap. The EtherNet/IP node identity is stored in the option card, not the power board, so network connectivity should be restored automatically after the drive powers up.

Downtime Control During System Migration

Minimizing unplanned downtime during a 1336-PB-SP23C board replacement requires a structured isolation and restoration sequence. Begin by coordinating with the process control team to schedule the swap during a planned maintenance window. Issue a permit-to-work, lock out and tag out (LOTO) the drive’s input disconnect, and allow the DC bus capacitors to fully discharge—typically 5–10 minutes after power removal, confirmed by measuring bus voltage at the DC bus terminals with a calibrated meter before touching any internal components.

Photograph the existing wiring harness connections and terminal block assignments before disconnecting anything. Label each connector with its corresponding board location. This documentation step takes less than five minutes but eliminates the most common source of commissioning errors: reversed or misrouted connectors after board reinstallation.

After installing the 1336-PB-SP23C, restore power and perform a no-load test run before reconnecting the motor load. Verify that the drive’s keypad or HIM displays the correct drive status, that no fault codes are active, and that the speed reference input is reading correctly. Then restore the motor connection and perform a loaded test at reduced speed before returning the drive to full automatic control. This staged commissioning approach limits exposure to process upsets and allows any wiring or parameter issues to be identified and corrected before the drive resumes production duty.

All units supplied by KNMKS are pre-tested prior to shipment. Each 1336-PB-SP23C undergoes functional verification to confirm power stage integrity before dispatch, reducing the risk of receiving a non-functional board and extending an already-planned maintenance window into an unplanned outage.

Retrofit Support FAQ

Q: Is the 1336-PB-SP23C a direct replacement for the original Allen-Bradley power board in my 1336 PLUS drive?
A: Yes, the 1336-PB-SP23C is designed as a form-fit-function replacement for the original power board in compatible 1336 PLUS drive frames. Verify your drive’s frame size and horsepower rating against the board’s specifications before ordering to confirm compatibility with your specific unit.

Q: Do I need to update the drive firmware or re-enter parameters after replacing the power board?
A: No firmware update is required. Drive parameters are stored on the control board, not the power board, so your existing parameter set—including speed references, PID settings, and fault configurations—remains intact after the swap. We recommend performing a parameter backup before the replacement as a precautionary measure.

Q: What pre-shipment testing does KNMKS perform on the 1336-PB-SP23C?
A: Each unit undergoes functional power stage verification prior to shipment. This includes testing of the power conversion circuitry to confirm the board is operational before it leaves our facility. The support terms confirmed by quotation cover manufacturing defects and functional failures under normal operating conditions from the date of receipt.

Q: What is the typical lead time and do you maintain stock?
A: KNMKS maintains inventory of the 1336-PB-SP23C to support urgent maintenance requirements. Standard orders ship within 1–3 business days. Contact our team at admin@knmks.com or +86 18359268345 to confirm current stock availability and lead time for your order quantity.

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Contact: admin@knmks.com | +86 18359268345

Product Identification

Brand / Ecosystem

Allen-Bradley
Allen-Bradley

Model / Series

1336-PB-SP23C

Product Family

PLCs & Controllers

Availability Status

Available on request after model and quantity confirmation

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B2B RFQ, replacement inquiry and project spare-part request

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Control platform

PLC, PAC and modular controllers

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CPU, rack, power and I/O expansion

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Replacement, cabinet build and maintenance

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

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• Brand and exact model number: Allen-Bradley 1336-PB-SP23C
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