Thread: First steel diy CNC router build
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14-06-2014 #23
The VFD is evidently faulty - I hope you can get it replaced. As has been mentioned, you don't need a braking resistor. The reason for that option is if the motor needs to stop a load with a large inertia, or stop very quickly, the energy transferred to the capacitors in the VFD can be too much which causes the voltage to rise too high. A resistor is used to dissipate some of the energy and keep the voltage within safe limits for the IGBTs. In our case the spindle rotor inertia is low, so this would only be useful if you want to stop it particularly promptly - e.g. in less than 1 second.
Nope - which two terminals you choose out of R,S,T makes no difference as they're just the connections to a 3-phase rectifier, so are equivalent.
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