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Driving Multiple AC Motors with a Single Drive

Yes, it is possible to drive multiple AC motors with a single drive, especially with smaller horsepower motors like yours (2Hp each). However, careful consideration is needed to avoid issues like reverse voltage spikes and ensure proper operation.

Considerations & Limitations:

• Total Horsepower: Ensure the drive's capacity exceeds the total horsepower of all motors (12 motors * 2Hp = 24Hp). A drive rated for at least 30Hp is recommended for safety and to handle inrush currents.
• Motor Control: You'll likely need a solution involving multiple output channels or a multi-motor controller.
• Wiring Configuration: Parallel connection of motors to a single drive is generally not recommended due to potential issues with unequal current sharing and voltage imbalances.

Recommended Approach: Using a Multi-Motor Controller/Drive

Siemens offers solutions like the SINAMICS G120X Modular with multiple output modules. This allows independent control of each motor while utilizing a single main drive unit.

Wiring to Avoid Reverse Voltage Spikes:

• Use Reactors/Chokes: Install AC line reactors on the input side of the drive and DC choke on the DC bus to mitigate voltage spikes.
• Proper Grounding: Ensure a robust grounding system to provide a path for transient currents.
• Output Filters: Consider using output filters to reduce harmonic distortion and improve motor performance.
• Motor Cables: Use shielded motor cables and proper cable termination techniques.

Disclaimer: This information is for general guidance. A qualified electrical engineer should perform a detailed system design and ensure compliance with all applicable safety standards and local regulations. Consult the drive's manual for specific wiring instructions.