Using Advancing Alternatives Controllers with AC Motors: Important Considerations
Advancing Alternatives’ Controller Interface Boxes (42-CB2 and 42-CB4) are widely used for automating various greenhouse assets. However, it’s crucial to understand their design purpose when connecting to different motor types.
Understanding CB2/CB4 with AC Assets
The CB2 and CB4 controllers are designed to operate AC assets that require a simple on or off function. This is ideal for equipment like:
- Fans: Turning a fan on or off for ventilation.
- Stall Motors: Often used for louvers or vents where the motor is designed to stall once the open or closed position is reached (e.g., “on” opens it, “off” allows it to close, usually with the help of springs or gravity).
These controllers provide single-direction power to an AC asset. They do not have the internal mechanisms to safely control AC motors that require distinct “open” and “close” commands (i.e., reversing direction).
Why CB2/CB4 Are Not For Reversing AC Motors
AC motors that need to run in both an “open” and “close” direction (forward and reverse) typically require interlocking contactors. These contactors are safety devices that physically prevent both the “open” and “close” circuits from being engaged simultaneously, which would cause a short circuit and damage the motor or system.
The CB2 and CB4 interface boxes do not feature these interlocking contactors and are not designed for direct interfacing with reversing AC motors. Attempting to use them in this manner could lead to serious electrical issues and component failure.
Recommended Solutions for Reversing Motor Control
If you need to control AC motors that require both “open” and “close” functions (like those used for ridge vents or roll-up sides with specific open/close limits), Advancing Alternatives recommends two reliable solutions:
- Use an AC Motor Control Box: We sell dedicated AC motor control boxes that are specifically designed for this purpose. These boxes contain the necessary interlocking contactors to safely manage the forward and reverse operation of AC motors. They act as an interface between your environmental controller and the AC motor itself.
- Utilize 24V DC Motors: Advancing Alternatives AegisTEC, AegisTEC+, and VCU2-24 environmental controllers are fully designed to directly power 24V DC motors. These DC motors are inherently suited for two-direction control and do not require an external contactor box, offering a simpler and more integrated solution for many applications.
By choosing the appropriate control solution, you can ensure the safe and effective automation of your greenhouse systems.