Technical Specifications

FAQ

1. What is the primary function of the 1336-SN-SP16A?
The 1336-SN-SP16A is an inverter snubber circuit board designed for use with Allen Bradley 1336 STE series AC drive systems. Its primary function is to suppress and control voltage transients generated during inverter switching. When power semiconductor devices switch at high speed, parasitic inductance, capacitance, and load characteristics can produce rapid voltage changes. The snubber circuit helps reduce the impact of these transient conditions on the inverter power circuit, supporting stable electrical operation and reducing excessive electrical stress on associated components. It is an internal drive circuit board rather than an independent controller or variable frequency drive.

2. Which Allen Bradley drives are compatible with the 1336-SN-SP16A?
The 1336-SN-SP16A is primarily associated with Allen Bradley 1336 STE series drive systems and is used with F Frame configurations. Compatibility should be verified against the complete drive catalog number, frame configuration, voltage rating, horsepower rating, and original circuit board part number. The fact that another board belongs to the 1336 product family does not automatically mean that it can replace the 1336-SN-SP16A. Before replacement, technicians should compare the identification information on the original board with the drive nameplate and existing hardware configuration.

3. What is the rated voltage associated with the 1336-SN-SP16A?
The 1336-SN-SP16A is used in 460 VAC-class 1336 STE inverter configurations. Because this component is an internal snubber circuit board, its voltage specification should be considered as part of the complete drive system rather than as the rating of an independent AC power input device. During replacement, the voltage class and complete configuration of the drive should be verified to ensure that the replacement board is suitable for the existing system. If the drive voltage, frame, or power configuration has been changed, compatibility should be confirmed before installation.

4. What symptoms may indicate a problem with the 1336-SN-SP16A?
A defective inverter snubber board may contribute to drive trips, abnormal overvoltage-related faults, unstable operation, or unexpected behavior during starting, acceleration, or load changes. However, these symptoms do not automatically confirm that the 1336-SN-SP16A is defective. Similar problems can be caused by DC bus abnormalities, power semiconductor failures, poor power quality, motor cable problems, grounding issues, or other internal drive circuits. Proper troubleshooting should therefore include reviewing drive fault codes, checking DC bus conditions, inspecting the power circuit, examining the snubber board for visible damage, and performing appropriate electrical tests before determining that the board needs replacement.

5. What should be checked before replacing the 1336-SN-SP16A?
Before replacement, verify that the original component is identified as 1336-SN-SP16A and confirm that the associated drive uses the appropriate 1336 STE F Frame configuration. The existing board should then be inspected for burnt components, discoloration, cracked parts, signs of electrical arcing, overheating, or other physical damage. Connectors, terminals, wiring, and mounting points should also be checked for loose connections, corrosion, or mechanical damage. If the original board has suffered severe electrical damage, the underlying cause should be investigated before installing a replacement. Possible causes include power semiconductor problems, excessive voltage transients, wiring faults, or failures in other protective circuits.

6. What safety precautions should be followed when installing the 1336-SN-SP16A?
Because the 1336-SN-SP16A is installed inside an AC variable frequency drive, maintenance must follow appropriate industrial electrical safety procedures. The drive should be disconnected from the power source, properly isolated, and allowed to discharge before internal components are accessed. The DC bus capacitors inside a variable frequency drive can retain hazardous voltage after incoming power has been disconnected, so switching off the main supply alone is not sufficient to establish a safe working condition. Qualified personnel should verify that the remaining voltage has fallen to an acceptable level before working inside the drive. Proper ESD precautions should also be used when handling the circuit board to avoid damaging sensitive electronic components.

7. How can compatibility between the 1336-SN-SP16A and an existing drive system be verified?
Compatibility should be determined using several pieces of identification information, including the complete drive catalog number, frame size, voltage class, horsepower rating, system configuration, and original circuit board part number. The 1336-SN-SP16A is associated with specific 1336 STE F Frame configurations, so it should not be treated as a universal snubber board for every 1336 series drive. Boards that look similar or use similar connectors may have different electrical characteristics or application requirements. For maintenance and spare-parts procurement, the safest approach is to compare the original board marking with the drive nameplate and existing hardware documentation before installation.

8. What checks should be performed after replacing the 1336-SN-SP16A?
After installation, confirm that the circuit board is securely mounted and that all connectors, terminals, and associated wiring are correctly positioned. Inspect the drive interior carefully to ensure that there are no loose screws, metal fragments, tools, or other foreign objects that could cause a short circuit. Before applying power, perform a final visual inspection of the complete installation. After power-up, check the drive status and fault information before proceeding with normal operation. A controlled test run should then be performed, gradually introducing operating conditions and load while monitoring for overvoltage, overcurrent, abnormal noise, excessive temperature rise, or unstable operation. If the original fault remains after replacement, further investigation should include the power modules, DC bus circuit, motor-side wiring, grounding, and other related protection circuits rather than repeatedly replacing the snubber board.