A-B 1336-CT-SP2A Frequency Converter Current Transformer Assembly

1. Product Description

The 1336-CT-SP2A is a critical internal circuit board assembly. Its primary function is to regulate the "inrush current" when the AC drive is first connected to power. By utilizing a precharge circuit, it protects the internal DC bus capacitors from being damaged by a sudden surge of electricity. This board is essential for maintaining the longevity and reliability of high-power 1336 PLUS, PLUS II, or IMPACT drives.

2. Technical Parameters

3. Product Advantages

• System Protection: Effectively limits inrush current, preventing blown fuses and capacitor failure.

• Seamless Integration: As an OEM (Original Equipment Manufacturer) part, it ensures 100% compatibility with existing 1336 drive hardware without the need for modifications.

• High Reliability: Built to industrial standards to withstand high-temperature environments and electrical noise.

• Extends Drive Life: By managing the power-up stress, it reduces the wear and tear on the drive's power semiconductors (IGBTs).

4. Key Applications

This board is used wherever Allen-Bradley 1336 drives are installed, including:

• Conveyor Systems: Managing motor speeds in logistics and mining.

• HVAC Systems: Controlling large industrial fans and water pumps.

• Manufacturing: Used in assembly lines and heavy machinery control.

• Water Treatment: Regulating centrifugal pumps and mixers.

5. Important Considerations (Precautions)

Warning: High Voltage Hazard

Variable Frequency Drives contain capacitors that store hazardous energy even after the power is turned off.

• Discharge Time: Wait at least 5–10 minutes after disconnecting power and verify with a voltmeter that the DC bus voltage is zero before installing the board.

• ESD Protection: This is a sensitive electronic component. Always wear an Anti-Static (ESD) wrist strap during handling to prevent static damage to the microchips.

• Firmware/Revision Match: Ensure that the "SP2A" revision matches your drive’s requirements, as different frames or series may require slightly different board configurations (e.g., SP1A vs. SP2A).

• Professional Installation: Replacement should only be performed by qualified personnel familiar with AC drive maintenance.