Dragonfly/ Butterfly Installation Guide | Installation |
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3.5.2Grounds and Returns
The “Returns” of the Dragonfly and Butterfly are structured internally in a star configuration. The returns in each functional block are listed below:
Functional Block | Return Pin |
Power | PR (Power Return) |
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Internal Switch Mode P.S. | PR (Power Return) |
Control section | Internal, not accessible |
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Feedback | SUPRET (J2/2) |
The returns above are all shorted within the Dragonfly and Butterfly in a topology that results in optimum performance.
1.When wiring the traces of the above functions, on the Integration Board, the Returns of each function must be wired separately to its designated terminal on the Dragonfly and Butterfly. DO NOT USE A COMMON GROUND PLANE. Shorting the commons on the Integration Board may cause performance degradation (ground loops, etc).
2.Return Traces: The return traces should be as large as possible, but without shorting each other, and with minimal
3.Main Power Supply and Motor Traces: The power traces must be kept as far away as possible from the feedback and control traces.
4.PE Terminal: The PE terminal is connected directly to the Butterfly's heatsink or to the Dragonfly's two PE strips on its lower board. In the Butterfly, the heatsink serves as an EMI common plane. The PE terminal should be connected to the system's Protective Earth. Any other metallic parts (such as the chassis) of the assembly should be connected to the Protective Earth as well.
5.Under normal operating conditions, the PE trace carries no current. The only time these traces carry current is under abnormal conditions (such as when the device has become a potential shock or fire hazard while conducting external EMI interferences directly to ground). When connected properly the PE trace prevents these hazards from affecting the drive.
Follow these instructions to ensure safe and proper implementation. Failure to meet any of the
