Vfd And Motor With Brake
Posted 04 October 2009 - 04:25 PM
I have a 500V motor that today uses Direct On Line start to run the motor. The motor has a brake, and I suppose that when you put 500V on the motor the brake is released and the motor turns. And when the power comes off, the motor brakes. If I want to control the motor with a MicroMaster 440, what happens with the brake if I only (for example) run it with 10Hz?
The motor is about 2kW and runs a vehicle on rail, but transports a very heavy load.
Posted 05 October 2009 - 06:11 AM
You should install a separate contactor for brake with separate three phase input, program an output contact of vfd that when it enable, contact should be closed and brake release.
Hope this would help you.
"Don't assume any thing, always check/ask and clear yourself".
Posted 13 October 2009 - 04:41 PM
I think I understand it better now... I discovered that the inverters (in this case Siemens MM440) have a function called "Motor Holding Brake", and I suppose that is the function I should use.
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