Allen-Bradley 1336T-GT1-SP34B Original Industrial Spare 1336 PLUS Compatible

Product Overview

Allen-Bradley 1336T-GT1-SP34B Original Industrial Spare 1336 PLUS Compatible: System Stability & Industrial Spare Parts Maintenance Value

In modern manufacturing and process automation environments, the Allen-Bradley 1336T-GT1-SP34B AC Drive Control Board Assembly is a mission-critical component within the 1336 PLUS Series variable frequency drive platform. This board — which integrates the 1336T-LM1EN logic module, 74103-015-52A gate driver board, and 74101-954-52C power interface assembly — governs the core inverter control logic, PWM signal generation, and drive-to-motor communication that keeps production lines running at rated efficiency. When this assembly fails, the entire drive becomes inoperable, resulting in unplanned downtime that can cost thousands of dollars per hour in lost throughput.

Sourcing an original, tested replacement unit of the 1336T-GT1-SP34B is the fastest path to restoring system stability. TOPNLMS stocks this assembly as a verified original spare, pre-tested under load conditions before shipment, and backed by a 12-month warranty covering manufacturing defects and functional failure under normal operating conditions.

Critical Technical Specs

Preventive Maintenance Strategy

A failed 1336T-GT1-SP34B rarely occurs in isolation. In most field cases, the control board failure is preceded or accompanied by stress on adjacent components within the same drive enclosure or electrical circuit. A disciplined preventive maintenance approach — one that treats the drive as a system rather than a collection of individual parts — dramatically reduces the risk of repeat failures and secondary damage.

When replacing the 1336T-GT1-SP34B, maintenance engineers should simultaneously inspect the 1336-MOD-L2E SCANport communication module, which handles the drive’s network interface to the PLC or DCS. A degraded communication module can cause erratic speed references or fault codes that are often misdiagnosed as control board failures. Similarly, the 1336-PB-SP2 power board and associated DC bus capacitor bank should be checked for bulging, leakage, or elevated ESR — capacitor degradation is one of the leading causes of control board stress in aging 1336 PLUS drives.

The 1336-BRF-SP1 brake resistor assembly and 1336-GM-SP1 gate module are also worth inspecting during the same maintenance window. These components share the same thermal environment as the control board and are subject to similar aging mechanisms. If the drive is installed in a dusty or high-humidity environment, the 1336-FAN-SP1 cooling fan assembly should be replaced proactively — a blocked or failing fan is a common root cause of thermal-induced control board failure.

At the system level, verify the integrity of the 1492-CABLE series I/O wiring harnesses and terminal block connections feeding the drive’s control terminals. Loose or corroded signal wiring at the analog input (terminals 1–6) or digital input terminals can introduce noise that damages the control board’s signal conditioning circuits over time. For drives integrated into a 1756 ControlLogix or 1769 CompactLogix PLC system, confirm that the drive’s SCANport or DeviceNet node address is correctly configured and that the 1203-GU6 DeviceNet communication adapter (if fitted) is functioning within spec.

For facilities managing multiple 1336 PLUS drives across a plant floor, it is strongly recommended to maintain a minimum stock of one 1336T-GT1-SP34B control board assembly per three to five installed drives, alongside a spare 1336-MOD-L2E and a set of 1492-J4 terminal block jumpers. This inventory posture ensures that any single drive failure can be resolved within one shift, without waiting for international freight.

Strategic Replacement Solutions

The 1336 PLUS Series was introduced in the early 1990s and remains widely installed across global manufacturing facilities, water treatment plants, HVAC systems, and material handling lines. Rockwell Automation has progressively moved this platform toward end-of-life support status, meaning OEM spare parts are increasingly difficult to source through standard distribution channels. The 1336T-GT1-SP34B assembly is one of the most frequently requested boards in this series precisely because it is the primary failure point when a drive loses control functionality while the power section remains intact.

Replacing the control board — rather than the entire drive — offers a compelling economic argument: a full 1336 PLUS drive replacement requires not only the capital cost of a new PowerFlex 400 or PowerFlex 525 equivalent, but also engineering time for parameter migration, potential rewiring of control terminals, and PLC program modifications to accommodate a new drive’s communication protocol. A direct board-level replacement with the 1336T-GT1-SP34B restores the original drive to full operation in under two hours, preserving all existing parameter settings stored in the 1336T-LM1EN logic module (if the module is undamaged) and maintaining full compatibility with the existing SCANport or DeviceNet network topology.

For facilities planning a phased migration away from the 1336 PLUS platform, maintaining a stock of original spare boards extends the operational life of installed drives by three to five years, providing the budget runway needed for a planned, orderly upgrade to current-generation drives without emergency capital expenditure.

Support FAQ

Q1: Is the 1336T-GT1-SP34B a direct drop-in replacement for my existing control board?
Yes. The 1336T-GT1-SP34B is an OEM-equivalent assembly designed for direct board-level replacement in 1336 PLUS Series drives. No firmware flashing or parameter reconfiguration is required if the 1336T-LM1EN logic module is transferred from the original board. If the logic module is also damaged, a new module will require parameter entry per the original drive’s parameter list.

Q2: How do I verify compatibility with my specific 1336 PLUS drive model?
Compatibility is determined by the drive’s catalog number (e.g., 1336T-BRF30-AN-EN4) and firmware revision, which are printed on the drive’s nameplate. Cross-reference the catalog number against the 1336 PLUS spare parts matrix (publication 1336-6.5.1) or contact TOPNLMS with your nameplate data for a compatibility confirmation before ordering.

Q3: What pre-shipment testing is performed on this assembly?
Every 1336T-GT1-SP34B unit shipped by TOPNLMS undergoes functional bench testing including power-on self-test, PWM output signal verification, and communication interface check. Units that fail any test parameter are quarantined and not shipped. A test report is available upon request for quality-critical applications.

Q4: What does the 12-month warranty cover, and how is a warranty claim processed?
The 12-month warranty covers manufacturing defects and functional failure under normal operating conditions from the date of shipment. It does not cover damage caused by incorrect installation, overvoltage events, or physical mishandling. To initiate a warranty claim, contact TOPNLMS via email with your order number, a description of the failure symptom, and photos of the installed unit. Replacement or repair will be arranged within 5 business days of claim approval.